blocks|key|2850582|text|只有self.collectionView.delegate+=+self;。请注意，UICollectionViewDelegateFlowLayout继承自UICollectionViewDelegate。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2850583|我承认一开始让我猝不及防。|2850584|哦，这只有在self.collectionView.collectionViewLayout实际设置为您的流布局时才会起作用。(或使用initWithFrame:collectionViewLayout:设置)|2850585|entityMap^0|2|10|17|Y|28|O|0|0|6|14|1V|Z|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|K|$]]

Just <code>self.collectionView.delegate = self;</code>. Note that <code>UICollectionViewDelegateFlowLayout</code> inherits from <code>UICollectionViewDelegate</code>.
I admit it caught me off guard at first.
Oh and this will only work if <code>self.collectionView.collectionViewLayout</code> is actually set to your flow layout. (or set with <code>initWithFrame:collectionViewLayout:</code>)

blocks|key|210275|text|根据前面的回答，只是使用的例子。它真的不清楚，但我可以展示它是如何工作的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|210276|@interface+PrettyViewController()<UICollectionViewDelegateFlowLayout,+UICollectionViewDataSource>
++++//some+code
@end

@implementation+PrettyViewController

-+(void)viewDidLoad+{
++++[super+viewDidLoad];

++++self.collectionView.delegate+=+self;//bingo!+right+here
}

#pragma+mark+-+UICollectionViewDelegateFlowLayout

-+(CGSize)collectionView:(UICollectionView+*)collectionView+layout:(UICollectionViewLayout*)collectionViewLayout+referenceSizeForFooterInSection:(NSInteger)section+{
++++return+CGSizeMake([[UIScreen+mainScreen]+bounds].size.width,+20.0);
}


@end|code-block|syntax|javascript|210277|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

According to previous answer just example of use. It really not clear but I can show how it works:

<pre><code>@interface PrettyViewController()&lt;UICollectionViewDelegateFlowLayout, UICollectionViewDataSource&gt;
 //some code
@end

@implementation PrettyViewController

- (void)viewDidLoad {
 [super viewDidLoad];

 self.collectionView.delegate = self;//bingo! right here
}

#pragma mark - UICollectionViewDelegateFlowLayout

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section {
 return CGSizeMake([[UIScreen mainScreen] bounds].size.width, 20.0);
}


@end
</code></pre>

blocks|key|212250|text|我对macOS+Mojave+-+Swift的两点看法|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|212251|(我跌倒在这里寻找NSCollectionView...我只知道问题是关于UICollectionView的。)|CODE|212252|上述所有内容(指定委托也意味着单元格大小)对于macOS也是正确的。|212253|注意:如果你写：|212254|class+MyViewController:
++++NSCollectionViewDelegate,
++++NSCollectionViewDataSource,
++++**NSCollectionViewDelegateFlowLayout**+
{|code-block|syntax|javascript|212255|方法：|212256|func+collectionView(_+collectionView:+NSCollectionView,+
++++++++++++++++++++++layout+collectionViewLayout:+NSCollectionViewLayout,+
+++++++++++++++sizeForItemAt+indexPath:+IndexPath)+->+NSSize|212257|将被调用为。|212258|如果移除，则不会调用任何委托方法。(因为类不遵守协议)。|212259|entityMap^0|2|K|0|9|G|11|G|0|0|0|0|0|0|0|5|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|14|8|@$9|15|A|16|B|H]|$9|17|A|18|B|H]]|D|@]|E|$]]|$1|I|3|J|5|6|7|19|8|@]|D|@]|E|$]]|$1|K|3|L|5|6|7|1A|8|@]|D|@]|E|$]]|$1|M|3|N|5|O|7|1B|8|@]|D|@]|E|$P|Q]]|$1|R|3|S|5|6|7|1C|8|@]|D|@]|E|$]]|$1|T|3|U|5|O|7|1D|8|@]|D|@]|E|$P|Q]]|$1|V|3|W|5|6|7|1E|8|@$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|X|3|Y|5|6|7|1H|8|@]|D|@]|E|$]]|$1|Z|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]]|10|$]]

My two cents for macOS Mojave - Swift

(I've fallen here searching for <code>NSCollectionView</code>... I do know question was about <code>UICollectionView</code>..)

All said above (specifying delegate implies cell size, too) is correct for macOS, too.

NOTE: If You write:

<pre><code>class MyViewController:
 NSCollectionViewDelegate,
 NSCollectionViewDataSource,
 **NSCollectionViewDelegateFlowLayout** 
{
</code></pre>

the method:

<pre><code>func collectionView(_ collectionView: NSCollectionView, 
 layout collectionViewLayout: NSCollectionViewLayout, 
 sizeForItemAt indexPath: IndexPath) -&gt; NSSize
</code></pre>

will be called. 

If removed, no delegate method will be called. (as class does not obey to the protocol).

blocks|key|2850658|text|如果你想在swift中使用它，只需使用这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2850659|在你的控制器委托中添加UICollectionViewDelegateFlowLayout，或者为这个扩展你的控制器，然后添加这个|2850660|func+collectionView(_+collectionView:+UICollectionView，layout+collectionViewLayout:+UICollectionViewLayout，sizeForItemAt+indexPath:+IndexPath)返回宽度{+->+CGSize+(宽度：(collectionView.frame.size.width+-+10)+/+2，高度：(collectionView.frame.size.width+-+10)+/+2)+}|2850661|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

if you want to use this in swift
just use this
UICollectionViewDelegateFlowLayout in your controller delegate or make an extension of your controller for this after that add this
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -&gt; CGSize {
return CGSize(width: (collectionView.frame.size.width - 10) / 2, height: (collectionView.frame.size.width - 10) / 2)
}

A UIViewController maintains a reference to a UICollectionView. The controller should modify the built-in flow layout using the UICollectionViewDelegateFlowLayout.

It's pretty easy to set the view's data source to self:

MyViewController.m

<pre><code>- (void)viewDidLoad
{
 self.collectionView.dataSource = self;
}
</code></pre>

But how do I set the controller to be the delegate flow layout of the view?

<pre><code>- (void)viewDidLoad
{
 self.collectionView.dataSource= self;
 // self.collectionView.??? = self; 
}
</code></pre>

I've tried:

<pre><code>- (void)viewDidLoad
{
 self.collectionView.dataSource= self;
 self.collectionView.collectionViewLayout = self; 
}
</code></pre>

But I get the error: "Incompatible pointer types assigning ...".

The collection header file looks like this:

MyViewController.h

<pre><code>@interface MyViewController : UIViewController &lt;UICollectionViewDataSource, UICollectionViewDelegateFlowLayout&gt;
</code></pre>

How to set UICollectionViewDelegateFlowLayout?

Swift

UIViewController维护对UICollectionView的引用。控制器应该使用UICollectionViewDelegateFlowLayout修改内置的流布局。将视图的数据源设置为self非常容易：MyViewController.m- (void)viewDidLoad{    self.colle...

问如何设置UICollectionViewDelegateFlowLayout？
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