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    <p>I’m not sure there’s much insight in creating a collection view programmatically and without bindings, but here it goes.</p> <h1>Introduction</h1> <p>There are essentially four components when using a collection view:</p> <ul> <li>View: a subclass of <code>NSView</code>, responsible for displaying information;</li> <li>The collection view itself;</li> <li>View controller: a subclass of <code>NSCollectionViewItem</code> that serves as the collection view item prototype;</li> <li>Model: an array of objects.</li> </ul> <p>Usually a view is designed in Interface Builder, and a model is mediated by Cocoa bindings.</p> <p>Doing it programmatically:</p> <h1>Constants</h1> <pre><code>static const NSSize buttonSize = {80, 20}; static const NSSize itemSize = {100, 40}; static const NSPoint buttonOrigin = {10, 10}; </code></pre> <h1>View</h1> <p>This is a standard view (a custom view in Interface Builder parlance) containing a button. Note that the view has fixed size.</p> <pre><code>@interface BVView : NSView @property (weak) NSButton *button; @end @implementation BVView @synthesize button; - (id)initWithFrame:(NSRect)frameRect { self = [super initWithFrame:(NSRect){frameRect.origin, itemSize}]; if (self) { NSButton *newButton = [[NSButton alloc] initWithFrame:(NSRect){buttonOrigin, buttonSize}]; [self addSubview:newButton]; self.button = newButton; } return self; } @end </code></pre> <h1>View Controller (Prototype)</h1> <p>Normally a view controller loads its view from a nib file. In the rare cases where the view controller doesn’t obtain its view from a nib file, the developer must either send it <code>-setView:</code> before <code>-view</code> is received by the view controller, or override <code>-loadView</code>. The following code does the latter.</p> <p>View controllers receive the corresponding model object via <code>-setRepresentedObject:</code>. I’ve overridden it so as to update the button title whenever the model object changes. Note that this can be accomplished by using Cocoa bindings without any code at all.</p> <p>Note that none of this code is specific to collection views — it’s general view controller behaviour.</p> <pre><code>@interface BVPrototype : NSCollectionViewItem @end @implementation BVPrototype - (void)loadView { [self setView:[[BVView alloc] initWithFrame:NSZeroRect]]; } - (void)setRepresentedObject:(id)representedObject { [super setRepresentedObject:representedObject]; [[(BVView *)[self view] button] setTitle:representedObject]; } @end </code></pre> <h1>Model</h1> <p>A simple array of strings representing button titles:</p> <pre><code>@property (strong) NSArray *titles; self.titles = [NSArray arrayWithObjects:@"Case", @"Molly", @"Armitage", @"Hideo", @"The Finn", @"Maelcum", @"Wintermute", @"Neuromancer", nil]; </code></pre> <h1>Collection View</h1> <p>So far, the only relation that’s been established is the view (<code>BVView</code>) used by the item prototype (<code>BVPrototype</code>). The collection view must be informed of the prototype it should be using as well as the model from which to obtain data.</p> <pre><code>NSCollectionView *cv = [[NSCollectionView alloc] initWithFrame:[[[self window] contentView] frame]]; [cv setItemPrototype:[BVPrototype new]]; [cv setContent:[self titles]]; </code></pre> <h1>Full Source Code for the Application Delegate</h1> <pre><code>#import "BVAppDelegate.h" static const NSSize buttonSize = { 80, 20 }; static const NSSize itemSize = { 100, 40 }; static const NSPoint buttonOrigin = { 10, 10 }; @interface BVView : NSView @property (weak) NSButton *button; @end @implementation BVView @synthesize button; - (id)initWithFrame:(NSRect)frameRect { self = [super initWithFrame:(NSRect){frameRect.origin, itemSize}]; if (self) { NSButton *newButton = [[NSButton alloc] initWithFrame:(NSRect){buttonOrigin, buttonSize}]; [self addSubview:newButton]; self.button = newButton; } return self; } @end @interface BVPrototype : NSCollectionViewItem @end @implementation BVPrototype - (void)loadView { [self setView:[[BVView alloc] initWithFrame:NSZeroRect]]; } - (void)setRepresentedObject:(id)representedObject { [super setRepresentedObject:representedObject]; [[(BVView *)[self view] button] setTitle:representedObject]; } @end @interface BVAppDelegate () @property (strong) NSArray *titles; @end @implementation BVAppDelegate @synthesize window = _window; @synthesize titles; - (void)applicationDidFinishLaunching:(NSNotification *)aNotification { self.titles = [NSArray arrayWithObjects:@"Case", @"Molly", @"Armitage", @"Hideo", @"The Finn", @"Maelcum", @"Wintermute", @"Neuromancer", nil]; NSCollectionView *cv = [[NSCollectionView alloc] initWithFrame:[[[self window] contentView] frame]]; [cv setItemPrototype:[BVPrototype new]]; [cv setContent:[self titles]]; [cv setAutoresizingMask:(NSViewMinXMargin | NSViewWidthSizable | NSViewMaxXMargin | NSViewMinYMargin | NSViewHeightSizable | NSViewMaxYMargin)]; [[[self window] contentView] addSubview:cv]; } @end </code></pre>
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    1. CODocumentation on NSCollectionView is surprisingly poor. Anyone who understands how this mythical beast works, and can share their knowledge, is helping out Objective-C developers everywhere. Thanks much.
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    2. COBavarious, may I ask you to show how to sync collection view with mutable array of items?
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    3. CO@Bavarious - thanks for a great answer.
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