从NIB大小问题加载UIView子类 [英] Loading a UIView subclass from NIB size issues

问题描述

我有一个UIView的子类，需要根据它的宽度来计算它的高度。在代码中创建时一切正常。但是，当我尝试在界面构建器中创建视图时，虽然我覆盖了所有相关方法，但我无法获得界面构建器中视图集的大小。

I have a subclass of UIView that needs to calculates it's height according to it's width. When created in code everything works. However when I try to create the view in Interface builder, and although I override all related methods, I can't get the size of the view set in interface builder.

- (id)initWithCoder:(NSCoder *)aDecoder
{
    NSLog(@"init with coder before super width %d",super.frame.size.width); // returns 0
    self = [super initWithCoder:aDecoder];
    NSLog(@"init with coder after super width %d",super.frame.size.width); // still returns 0
}

- (void) awakeFromNib
{
      NSLog(@"width of view %d",super.frame.size.width); // Returns 0 as well
}

- (void) setFrame:(CGRect)aFrame
{
    [super setFrame:aFrame]; // Called from initWithCoder by super. Correct frame size. 
}  

所以我的下一个猜测是我的观点的超级视图可能是设置我的视图awakeFromNib之后的帧。事实证明它没有。我在我的视图上覆盖了setFrame，并在initWithCoder期间调用它。

So my next guess was the maybe the superview of my view is setting my view's frame after awakeFromNib. Well it turns out it doesnt. I overrided setFrame on my view, and it is called during initWithCoder.

所以这就是我所知道的：

So this is what I know so far:

1. 首先调用initWithCoder


2. 在initWithCoder期间调用setFrame：（CGRect）aFrame


3. in setFrame框架的大小是正确的，我调用[super setFrame：aFrame]


4. awakeFromNib被调用


5. super.frame.size.width在awakeFromNib中= 0 = self.frame.size.width也是0


6. 当完成该过程时，看起来视图下方几个像素，但我猜我的代码变得如此紧密，以及它可能是我做的事情。

1. First initWithCoder is called
2. During initWithCoder a call to setFrame:(CGRect)aFrame is sent
3. in setFrame the size of the frame is correct, and I call [super setFrame:aFrame]
4. awakeFromNib is called
5. super.frame.size.width = 0 in awakeFromNib self.frame.size.width is also 0
6. When the process is done, it seems that the view is a few pixels below where it's suppose to be, but I guess my code get so massed up with the dimensions that it might be something I do.

任何帮助将不胜感激

推荐答案

如果您扩展 initWithCoder ，请务必致电超级方法。在此超级通话期间，您的班级将调用 setFrame 。

If you extend initWithCoder, be sure to call the super method. It is during this super call that setFrame will be called on your class.

然后，您可以重新使用标准 initWithFrame 来电。

You can then re-use your standard initWithFrame call.

我总是这样做以下：

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder]; // Required. setFrame will be called during this method.
    return [self initWithFrame:[self frame]];
}

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