Uicollectionview Example Programmatically Objective C

X-post from StackOverflow, hope you don't mind! I've spent hours searching and trying things and I'm coming up empty. It's implemented using Objective-C and Swift languages. firstBaseline. Learn to use supplementary view in UICollectionView. It can be just a Single View Application. Store a weak reference of it inside the controller, and the rest is the same. In this post I will exemplify what it means if the objective c code of your iOS application is not thread safe. iOS UICollectionView: The Complete Guide, Second Edition teaches you everything you need to know to take advantage of Apple's new user interface, UICollectionView. - Implement CI/CD using Bitrise. This example is also similar to it. Feel free to use what you need and, of course, suggest better, more efficient approaches. ios,objective-c,swift,video I want to add background view with video (or gif) like in app "Uber" I'd like to use video background view for a long time in my app. lastBaseline stackView. Now I'll show you how to perform an unwind segue in code and how to pass data along the unwind segue. What is a placeholder Well, a placeholder is a character, word, or string of. battery charge, network connection, time etc. Objective-C [self. You can extend the UIDataGrid control in a number of ways to build custom behaviors into your iOS apps. In an iOS 7+ app in Swift, I'm trying to add a header with a UILabel in it whose height should adjust based on the height of UILabel. February 26, 2016 gabrielmassana best practice, github, interface builder, ios, objective-c, programmatically, segue, storyboards, uiwindow, xibs 3 Comments The first professional app I ever touched was supporting iOS4 and builded fully with Xibs. In Objective-C you can call methods on nil objects (more precisely, you can send a message to a nil object), and these methods return a zero value. Both UITableView and UICollectionView are data-source- and delegate-driven. Even though the library is not complex to integrate and use on your own projects it would be nice to show how to use different animations in different scenarios. Now I'll show you how to perform an unwind segue in code and how to pass data along the unwind segue. Many iOS developers think of UICollectionView as UITableView with a grid. I would like to programmatically select a cell. iOS example of a UICollectionView with a subclassed UICollectionViewLayout? I'm trying to create a grid-like layout that allows scrolling in both directions, so it has to be a subclassed UICollectionViewLayout and not a UICollectionViewFlowLayout (which only allows scrolling in one direction). UICollectionView has been called “the new UITableView“, which is not much of an exaggeration. The UICollectionView is same as UITableView. Not only it simplifies the way to arrange visual elements in grid layout, it even lets developers customize the layout (e. cell more visible in our example project cell. This approach is much more tedious and lengthy in comparison to the constraintsWithVisualFormat Approach. Follow below steps for Simple UICollectionView using Objective-C. Or Centre UICollectionView Cells Horizontally iOS for US dudes. isAccessibilityElement = true articleImageView. Swift UICollectionView Cells Mystiously Repeat We are trying to make a collection view. Let's go ahead and Create a New File in our project, base it off of Objective C Class. The other day, I needed to save some text as a PDF in a C# app. horizontal stackView. asmx extension. I ran code provided in first answer Creating a UICollectionView programmatically. Organization of This Book. Use UICollectionView selectItemAtIndexPath:animated:scrollPosition: method to edit choice selection programmatically. UICollectionView has been called "the new UITableView", which is not much of an exaggeration. iOS example of a UICollectionView with a subclassed UICollectionViewLayout? I'm trying to create a grid-like layout that allows scrolling in both directions, so it has to be a subclassed UICollectionViewLayout and not a UICollectionViewFlowLayout (which only allows scrolling in one direction). You can imagine a rectangular paper sheet over which which you can draw, color,move etc and keep more paper sheets over it. Objective-C Associated Objects; OpenGL; Passing Data between View Controllers; Passing Data between View Controllers (with MessageBox-Concept) PDF Creation in iOS; plist iOS; Profile with Instruments; Push Notifications; QR Code Scanner; Realm; Resizing UIImage; Rich Notifications; Runtime in Objective-C; Safari Services; Security; Segues; Set View Background. At the top of your Swift source files (if you have any), use import Realm. Using the Realm framework. Featured Post: Implement the OAuth 2. When browsing through cells (in simulator) I can see from logs that focus changes correctly but focused item is not zoomed like in Apple example code. I'm doing it in Objective C. Fortunately, it only takes two steps. Sometimes you need to prevent the infinite scroll from continuing. Created By: Debasis Das (16-Jan-2016) In this post we will apply constraints to 4 views in a NSWindow using swift NSLayoutConstraint programatically. What types of data can I send?. But with a little math and a lot of creativity, UICollectionView can be used to render timelines, charts and graphs, parallax scrolling landscapes and more. There are several different ways to do that, for example, kqueue or GCD. Learn to use supplementary view in UICollectionView. Since the SDK is written in C++ you have to switch to Objective C++ which allows mixing C++ with Objective-C-Code. Objective C example to programmatically change the WiFi name and password? 72 Views 0 Replies. Also Visit. Before we put our fingers into the jar with the honey and taste the creation of constraints programmatically, there’s a starter project for you to. Now collection view is added pro grammatically. UICollectionView Pt 4: CREATE CUSTOM UICOLLECTIONVIEWCELL SUBCLASS, AUTO LAYOUT How to create Collection View Controller in iOS using Objective-C ? Build UICollectionView programmatically. This is not to say that collection views are in any way unknown or obscure. In Objective-C , NSDictionary is the most common used class. So, Let see what we have to change to get the push notifications in iOS 10. Create a static UITableView without Storyboards 27 April 2014 on ios, objective-c, cocoa, swift. How to programmatically move a control or subview to the front of the view « on: August 11, 2014, 01:53:08 AM » You can call a view's bringSubviewToFront: method to bring a control or subview to the front. There are lots of examples on the web that shows how to create a simple Crystal Report programmatically, by sending the SQL query to Crystal, which seems to work nicely. READ THE FAQ FIRST! FAQ About. Now I'll show you how to perform an unwind segue in code and how to pass data along the unwind segue. Apple also renamed lots of methods when releasing Xcode 8. Creating a new certificate usually involves using the makecert. This approach is much more tedious and lengthy in comparison to the constraintsWithVisualFormat Approach. Posted on April 21, ← objective c [ios] : หาความสูงรวมของ content ใน scroll view. openURL Deprecated in iOS10 Sep 19, 2016 · 3 minute read iOS 10 Apple introduced the openURL: method as a way to open external links with iOS 2. 0 Authorization Code with PKCE Flow. You can easily customize the appearance of the UIDataGrid control by choosing among several properties. LibXL is a library for direct reading and writing of Excel files (xls/xlsx) without OLE automation and Microsoft Excel. iOS Programming Recipe 35 - Implementing The Common Views: UIPickerView, UITableView, and UICollectionView November 27, 2014 by Joe Hoffman Leave a Comment Over the past couple years I've noticed some patterns when it comes to noobs and the more useful iOS UI elements. Add the code. Some platform-specific functionality is available through existing packages; see using packages. IO classes to work with files and directories in iOS that you would use in any. From this post I'll write some Objective-C code here periodically. Delphi Source Code – Delphi (DCU) Objective-C (Xcode) This sample shows you how to use the Dylib edition of Quick PDF Library for Mac with Objective-C and Xcode. zip has the following entries. Yes, the iOS pattern is that a delegate object is optional. Data in the collection view is organized into individual items, which can then be grouped. Chromosome – A sequence of genes that might be a good solution to the problem being solved. Today We will learn how to create a Simple WKWebView in iOS. UICollectionView custom layout tutorial. This can be done in File Inspector View on the right. Make a reasonable test case & run instruments. But I added the Facebook SDK today, and since those elements (LoginButton specifically) are only available in code, I'm trying to add them and set their layout constraints. If you’re trying to write your first-ever iOS application, this book probably isn’t for you. TouchControls iOS Framework library from Rustemsoft is Swift & Objective C software package specifically designed for Xcode developers. The allowsMultipleSelection property of UICollectionView class controls whether multiple items can be selected simultaneously. We will cover both how to add a text field in Interface Builder and how to create one programmatically. How to create and manage forms with Foxit PDF SDK (Objective-C) PDF currently supports two different forms for gathering information interactively from the user – AcroForms and XFA forms. For example, the bounds of the UICollectionView might change - such as when the orientation changes - or items may be added or removed from the collection. Data in the collection view is organized into individual items, which can then be grouped. NET Core C# • C# UWP/WinRT • DataFlex • Delphi ActiveX • Delphi DLL • Visual FoxPro • Java • Lianja • MFC • Objective-C • Perl • PHP ActiveX • PHP Extension • PowerBuilder • PowerShell • PureBasic • CkPython • Chilkat2-Python. Step – 2: Create UI for Simple UICollectionView. There is an extensive FAQ for beginners. These cases are out of scope for this tutorial, but it's important to be aware of them in a non-trivial implementation. Creating a new certificate usually involves using the makecert. Issue with UICollectionView using xamarin. UITableView scrollToRowAtIndexPath atScrollPosition animated Scrolls the receiver until a row identified by index path is at a particular location on the screen. Create UICollectionView programmatically. With each bug report, Instabug automatically captures details like network requests, repro steps, and session details. Google Drive Examples for VB. Media Library pop up opened by hitting the keys "command", "shift", and "m" at the same time. To enable multiple selection, the trick is to set the property to YES. With these basics at hand we will do some experiments to explore the nature of not thread safe code. In NSDictionary, Entries are stored in the form of key value pairs. Web API Categories ASN. It is working fine. Organization of This Book. First, I will cover some basics that will be helpful to understand thread safety. Currently, this process still works, but it's a much easier task to implement, through specific interfaces and extension methods that come with. UICollectionView(UICollectionViewLayout) constructor or can changed with SetCollectionViewLayout. Kinect in Motion - Audio and Visual Tracking by Example is a compact reference on how to master color, depth, skeleton, and audio data streams handled by Kinect for Windows. I'm doing it in Objective C. It's been a popular tool for developers since, so let's review how to create one in Swift (if you need it in objective-c read Tutorial: Collection View using Flow Layout). First of all create Xcode project, which support Objective-C programming language. Consider this scenario where your crystal report has 4 fields and you have a dropdown with these 4 field names. The UILabel has lines = 0. When you add, delete, or move a single item programmatically, the collection view’s methods automatically create animations to reflect the changes. You can implement loadView and create your UICollectionView object there. Our iOS frameworks are written in Objective-C, however, since Objective-C frameworks are able to be used in Swift code (with the help of a Bridging Header File) I am going to program in Swift to showcase how to use LEADTOOLS’ iOS SDK with Swift. If backwards compatibility is absolutely a must use TableLayout, which has been around since API 1. A protip by novalagung about ios and objective-c. Build and run a project, and you will see a layout from images above. This tutorial covers how to add header and footer view in UICollectionView which uses flow layout. If you're working entirely in code, you can register a UICollectionViewCell subclass for use with your collection view, so that new cells are dequeued and re-use automatically by the system. I'm doing it in Objective C. If the allows Selection property is false, calling this method has no effect. The collection view gets its data from the data source object, which is an object that conforms to the UICollection View Data Source Protocol and is provided by your app. Hi all, I'm self learning iOS development and pretty new to it. Questions: I’ve read a bunch of posts on adding header to UICollectionView. For me there is the only true way to do it programmatically:. 1) First of all, I think you need to change how you look at that layout. The CollectionView actually maintains a stack of SortDescription objects, each of them being a Structure can hold information of a Column and the Direction of Sorting. Components of a genetic algorithm. However, if I scroll to the bottom the scrollview does not let me scroll to the bottom of the last few rows (it snaps back). Now collection view is added pro grammatically. Seamlessly preload content. let stackView = UIStackView() stackView. io; Get a Google Drive OAuth2 Access Token; Google Drive Refresh Access Token. In the JavaScript API, this is done with event listeners. distribution =. You can extend the UIDataGrid control in a number of ways to build custom behaviors into your iOS apps. UICollectionView has been called "the new UITableView", which is not much of an exaggeration. I want to move the cell position. Optional types. The goal is to build up a useful repository of objective-c code focusing on iOS implementations. Most apps with complex UI now doesn't simply display a table of things or a grid of things that we can achieve by using a single UITableView or UICollectionView. etc and their mutable objects. One of the most obvious changes in Swift 3 is its naming convention. Learn from the best. - Unit Testing / UI Testing. Chose a name, select Use Storyboards and ARC and save the project somewhere. In that example, I put a "Next" button on each view controller that goes from #1 to #3 in order. Is there a way (whether REST, JSON, or neither) to programmatically access Agile boards? Jonathan Hayward Oct 10, 2013 I am trying to work on a client that would talk to a JIRA instance and take my own spin off a Kamban (or Scrum) agile board, in which cards are moved between different lanes during the project's duration. As you've already noticed, we are going to created two different UICollectionView layouts, as presented in "Expected result. Tags: app development for ios,. What is a placeholder Well, a placeholder is a character, word, or string of. firstBaseline. Creating custom UICollectionView layouts. Programmatically change background color subtitles in AVPlayer For example, if I put : I tried doing this via a helper method written in Objective-C, the rest. What is the best view/control to use to filter the data in the cells and are there any existing apps that I can download for a good example?. The incredible flexibility of collection views for displaying and facilitating interaction with a collection of data items makes it one of the most valuable tools in the UIKit toolbox for iOS 6 and above. Of course, PFD is in no manner closed for editing, but it is, let's say' fairly closed for the standard user, or at least fool proof so as to deny "mistakenly. xib you won't be able to change the color programmatically. Since the SDK is written in C++ you have to switch to Objective C++ which allows mixing C++ with Objective-C-Code. Make a reasonable test case & run instruments. Written By: Debasis Das (7-May-2015) Undoubtedly Autolayout is a powerful tool at the hands of Cocoa & iOS Developers. - Replace storyboard with programmatically created UI. First, take a look at the example of the finished project. Featured in the Apple App Store!. What's New: iOS 11 introduced the drag and drop feature that lets you drag , drop the content from one application to other application on iPad. Hopefully you all can. “at” sign compiler directives are as central to understanding Objective-C’s gestalt as its ancestry and underlying mechanisms. This tutorial will teach you how to use the iOS 6 UICollectionView class to build a "Springboard" layout that looks and acts like the iOS Home Screen! Along the way, you'll gain a solid grasp of collection view fundamentals in order to create your own grid based layouts. In this Swift code example we will learn how to create UICollectionView in Swift Programmatically. storyboard file, fix compile and run-time errors. Google uses this test framework to test many iOS native apps including Google Calendar, YouTube, etc. iOS UICollectionView: The Complete Guide, Second Edition teaches you everything you need to know to take advantage of Apple's new user interface, UICollectionView. Simple, Jackson Annotations, Passay, Boon, MuleSoft, Nagios, Matplotlib, Java NIO. Create Certificates, Identifiers & Provisioning Profile. Creating UITableViews programmatically is quite easy once you get the hang of UITableViews and become familiar with the various methods in UITableViewDataSource and UITableViewDelegate. Later in the chapter we will be implementing code to remove items from the array, so need to call the mutableCopy method of the array to make sure. First of all create Xcode project, which support Objective-C programming language. Implementation. iOS Auto Layout tutorial programmatically In this great iOS Auto Layout tutorial I'll teach you how to support rotation, use constraints, work with layers, animate corner radius. In MonoTouch, you can combine the UITableView 's data source and delegate object with a single class: an instance of UITableSource. Learning and teaching about interesting topics in iOS Development. For that drag the Collection View onto the View Controller and drag it to cover the full screen below the navigation bar. If you are looking to get started (iOS programming in general or some specific area), here are more relevant links for you:. Autolayout Visual Format Language – Objective C Sample Code. About Cocoa-Matic. This causes the collection view to discard any currently visible items (including placeholders) and recreate items based on the current state of the data source object. Discover smart, unique perspectives on Uicollectionview and the topics that matter most to you like ios, swift, uitableview, ios app development, and. With each bug report, Instabug automatically captures details like network requests, repro steps, and session details. Follow below steps for Simple UICollectionView using Objective-C. backgroundColor. Example Create a new project. This tutorial will teach you how to use the iOS 6 UICollectionView class to build a "Springboard" layout that looks and acts like the iOS Home Screen! Along the way, you'll gain a solid grasp of collection view fundamentals in order to create your own grid based layouts. vantage of UICollectionView. It can be just a Single View Application. I know this is a swift concentrated website, but has it been discovered how to have an IBIspectable's value changed in IB to be redrawn with Objective-C? I know that in Swift you use the didSet method, but I have not been able to get IB to work with any Objective-C equivalent methods to be able to change the value in IB and also see the. I ran code provided in first answer Creating a UICollectionView programmatically. For ease of this example turn Auto Layout and Size Classes off using the iPad size for the view. articleImageView. UICollectionView custom layout tutorial. Starting with an introduction to Kinect and its characteristics, you will first be shown how to master the color data stream with no more than one page of lines of code. You can configure a table to display a single long list of rows, or you can group related rows into sections to make navigating the content easier. The following code shows how to update the interface declaration in ViewController. Hopefully you all can. There is an extensive FAQ for beginners. Hi i am beginner in ios and in my project have to create UICollectionView with adding UIHeader as like how we are adding UItableView Header but according to my code. 1) First of all, I think you need to change how you look at that layout. Using the Twilio REST API, you can make outgoing calls to phones, SIP-enabled endpoints, and Twilio Client connections. There's actually a few different choices. Doing so will give my users a much richer user experience without resorting to private API's. Interactive Docs Read Docs and Examples. NET Core C# • C# UWP/WinRT • DataFlex • Delphi ActiveX • Delphi DLL • Visual FoxPro • Java • Lianja • MFC • Objective-C • Perl • PHP ActiveX • PHP Extension • PowerBuilder • PowerShell • PureBasic • CkPython • Chilkat2-Python. Base UIViewController with UICollectionView. You can implement loadView and create your UICollectionView object there. See More Google Drive Examples at rest-examples. Happy learning!!. Replace this piece of code. You can add more items in. It is very important that the type that you specify implements a public constructor that takes a RectangleF parameter, this is used to initialize the class from an object allocated by Objective-C. Replace this piece of code. You should never allocate new cells in this method, instead use the provided adapter to call one of the dequeue methods on the IGListCollectionContext. Organization of This Book. Zip Examples for VB. “at” sign compiler directives are as central to understanding Objective-C’s gestalt as its ancestry and underlying mechanisms. In this guide, we'll explore how you can use Twilio's Programmable Voice API to: To place an. The core syntax of C# language is similar to that of other C-style languages such as C, C++ and Java. We are going to build upon the example we built in my first post. I’ll suppose you are not totally new with Objective-C. This article provides the high level overview with example code on this to drag and drop the UICollectionViewCells in UICollectionView. This settings will give you something close to image you posted, you can edit it for your needs later: On storyboard go to your UICollectionView's size inspector. Solution This app has crashed because it attempted to access privacy-sensitive data without a usage description. Objective-C has a rich history and a very different way of doing things that may come as a surprise. Hi all, I'm self learning iOS development and pretty new to it. Let’s take advantage of Storyboards to implement a Collection View in our View Controller. To make new Swift APIs to be compatible with existing Objective-C…. I want to move the cell position. Here some example how to do that programmatically:. About the book iOS 4 in Action , written for Xcode 4, is a detailed, hands-on guide that goes from setting up your development environment, through your first coding steps, all the way to creating a polished, commercial iOS 4 application. You can modify the layout of your UICollectionView by: Editing attributes and dimensions of the Collection View Flow Layout in the storyboard; Programmatically changing values and defining behavior. BATabBarControllerDelegate. So how can I achieve this? To further clarify: when I say programmatically I mean inserting a cell during runtime, when an action is fired, not when the app is loaded (using the viewDidLoad method). - Extend the app's functionality, fix bugs, test and submit new releases of the app to AppStore. Theano, Flutter, KNime, Mean. How to create and use UIcollectionView programmatically? Tag: ios , iphone I have searched a lot for creating a UICollectionView programatically but none of them suggest the simplest way to use it, how to add a label or an image to the UICollectionViewCell. I'll leave that UI frob to you, but th. Objective-C: Programmatically set UIView alignment without using Storyboard. Example Create a new project. Create a single view project in Objective C and open the Storyboard. When browsing through cells (in simulator) I can see from logs that focus changes correctly but focused item is not zoomed like in Apple example code. This article also provides examples that show how protocols are used both as the basis for Objective-C delegates and in non-delegate scenarios. ⭐️ Last update: 24/08/19 ⭐️. I had to do this for a project recently so thought I would share. It can be just a Single View Application. Square brackets, ridiculously-long method names, and @’s. How to create a X509Certificate2 programmatically? X509 compatible certificates are commonly used in various scenarios. Looking for the API Reference docs? Check out the full API reference for Calls. Learn to use supplementary view in UICollectionView. C++ example with input arguments using flags Regular Expression to Grab an Object Reference Name from a C# Code File. Here is what I did: //subclass. BATabBarControllerDelegate. As a data controller, you can use the Experience Platform SDKs to support GDPR retrieve and delete requests from your mobile apps. How to start the default internet browser programmatically by using Visual C-Sharp. firstBaseline. Below is the simple Dictionary in JSON format. I would like it to appear as such that there is a 10pt padding all around. This is not to say that collection views are in any way unknown or obscure. Posted on April 21, ← objective c [ios] : หาความสูงรวมของ content ใน scroll view. Let’s see some example by taking a standard UIButton item as the first object and its Parent View (or superview, as it is called by Objective-C) as the second one. Objective-C. ios and mmvmcross v3 up vote 0 down vote favorite We have an UICollectionView using an custom MvxCollectionViewSource as source. If you're working entirely in code, you can register a UICollectionViewCell subclass for use with your collection view, so that new cells are dequeued and re-use automatically by the system. Open Xcode, create a new project and select a single View application. iOS, Custom cell with button rybody has shown same sample tutorial with one image inside UICollectionViewCell Desired output UICollectionViewCell with custom design What I have done This is what I have achieved so far. isSelected is a UICollectionViewCell’s stored property that represents the cell selection state. This is not to say that collection views are in any way unknown or obscure. Autolayout Visual Format Language - Objective C Sample Code. For me there is the only true way to do it programmatically:. Now i want to add some pictures in cell that can expanded by mouse click. It has a learning curve but gives immense control over UI resize properties to developers. If you're working entirely in code, you can register a UICollectionViewCell subclass for use with your collection view, so that new cells are dequeued and re-use automatically by the system. This approach is much more tedious and lengthy in comparison to the constraintsWithVisualFormat Approach. Latest reply on Aug 16, 2018 11:19 AM by harleyfrazee. First, I will cover some basics that will be helpful to understand thread safety. We will cover both how to add a text field in Interface Builder and how to create one programmatically. We noticed that after adding four cells, when we add a new cell, the text field is already filled with the information from previous. This guide describes how to write custom platform-specific code. UICollectionView is a content- and layout-agnostic tool that developers can use to display content in applications. IOS UICollectionView Sample. UICollectionView single-handedly changes the way we will design and develop iOS apps from here on out. ) before trying to interact with the UI. Many iOS developers think of UICollectionView as UITableView with a grid. For example, EarlGrey tests will automatically wait for events (animations, network requests etc. This book begins with a review of the TCP/ IP protocol suite and a refresher of the core elements of the Python language. This tutorial has been designed for software programmers with a need to understand the iPhone and iPad application development on iOS using Objective C programming. Hi all, I'm self learning iOS development and pretty new to it. Objective-C: Programmatically set UIView alignment without using Storyboard. UICollectionView(UICollectionViewLayout) constructor or can changed with SetCollectionViewLayout. This archive provides a wide variety of basic open-source examples that show how to design and build X3D scenes. Today we're talking about detecting directory changes. So, Let see what we have to change to get the push notifications in iOS 10. To make new Swift APIs to be compatible with existing Objective-C…. The below swift code example will cover. The primary thing is the same thing you do for any performance issue. This also includes protocols and subclasses. To make new Swift APIs to be compatible with existing Objective-C…. It seems your question is too vague so you might need to share some more details like how exactly you want to achieve this by providing more insights with similar examples or some code which you have tried. IT Tutorials with Example is a Tech blog and provides Articles on HTML5, CSS3, Javascript, C#, SQL, WPF, Asp. Infinite scroll offers an option to specify offset in points that will be used to start preloader before user reaches the bottom of scroll view. This approach is much more tedious and lengthy in comparison to the constraintsWithVisualFormat Approach. Type in UICollectionViewCell as the subclass and name it MyCustomCell. This guide uses UICollectionView as examples, but in Objective C++ and optimises it a lot. We noticed that after adding four cells, when we add a new cell, the text field is already filled with the information from previous. This also includes protocols and subclasses. Base UIViewController with UICollectionView. We noticed that after adding four cells, when we add a new cell, the text field is already filled with the information from previous. At the top of your Objective‑C source files, use #import to import Realm Objective‑C and make it available for use with your code. As you can see, we didn’t import anything, unlike in Objective-C. For example, if your search API has no more results, it does not make sense to keep making the requests or to show the spinner. It's used to display a grid of cells, and what better to display in those cells than some beautiful photos from 500px? I've got an example project completed and hosted on github that you can check out and play with. fillEqually. I can't dequeue anything in cellForItemsAtIndexPath because it never gets called. What’s more, some of the language features in Objective-C that can help ease this transition aren’t necessarily well-documented or publicized.