在awakeFromNib中获得插座尺寸 [英] Get outlet size within awakeFromNib

问题描述

我创建了一个自定义UICollectionViewCell，其中包含标签的出口(放置在情节提要中).我想从自定义UICollectionViewCell的awakeFromNib方法中获取此标签的高度，但标签的大小始终为0.000000:

I created a custom UICollectionViewCell containing an outlet for a label (placed in the Storyboard). I'd like to get the height of this label from within the awakeFromNib method of my custom UICollectionViewCell, but the size of the label is always 0.000000:

// .h
@interface MyCustomCell : UICollectionViewCell

@property (weak, nonatomic) IBOutlet UILabel *myLabel;

@end

// .m
@implementation MyCustomCell

-(void)awakeFromNib
{
    [super awakeFromNib];

    NSLog(@"%@", self.myLabel);
    NSLog(@"%f", self.myLabel.frame.size.width);
    NSLog(@"%f", self.myLabel.frame.size.height);
}

@end

控制台输出:

2013-02-06 11:13:59.628 Test[8880:c07] <UILabel: 0x7649a00; frame = (0 0; 0 0); text = '12h00'; clipsToBounds = YES; opaque = NO; autoresize = TM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x7649ac0>>
2013-02-06 11:13:59.628 Test[8880:c07] 0.000000
2013-02-06 11:13:59.630 Test[8880:c07] 0.000000

如何获取标签的尺寸? 调用awakeFromNib时获取此类信息是否为时过早?如果是这样，我应该在哪种自定义单元格中获取尺寸?

How can I get the size of my label ? Is it too soon to get such information when awakeFromNib is called ? If so in which method of my custom cell should I get the size ?

编辑

这是在ViewController中观察到的相同的奇怪行为:

Here is the same strange behavior observed in the ViewController:

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    MyCustomCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"MyCustomCell" forIndexPath:indexPath];
    NSLog(@"%@", cell);
    NSLog(@"%@", cell.myLabel);
}

输出:

2013-02-07 16:07:34.488 Test[30308:c07] <MyCustomCell: 0x7156980; baseClass = UICollectionViewCell; frame = (20 0; 290 655); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x7156a80>>
2013-02-07 16:07:34.489 Test[30308:c07] <UILabel: 0x7158100; frame = (0 0; 0 0); text = 'this is a text'; clipsToBounds = YES; opaque = NO; autoresize = TM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x7158040>>

推荐答案

部分答案是在dreamzor对

A part of the answer is in dreamzor's response to iOS AutoLayout - get frame size width.

技巧是将与框架相关的代码放置到viewDidLayoutSubviews方法中

The trick is to place your frame-dependent code to the viewDidLayoutSubviews method

在我的特殊情况下，我发现在要求出口尺寸之前，在自定义单元格awakeFromNib方法中添加[self layoutIfNeeded];就像一种魅力.

In my particular case, I found that adding [self layoutIfNeeded]; in my custom cell awakeFromNib method, right before asking for the outlet size worked like a charm.

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