获取iOS视图的实际尺寸

Question

我如何获得我正在控制的视图或子视图的实际尺寸？例如:

UIView *firstView = [[UIView alloc] initWithFrame:CGRectMake(0,0,200,100)];
[self addSubview:firstView];

UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(10, 20, 230, 120)];
[firstView addSubview:button];

如您所见,我的button对象超出了添加到的视图的尺寸.

这是心灵(假设有许多对象被添加为子视图),我如何确定实际的宽度和高度firstView？

Answer 1

如果您想让按钮与firstView具有相同的宽度和高度，您应该使用UIView的bounds属性，如下所示：

UIView *firstView = [[UIView alloc] initWithFrame:CGRectMake(0,0,200,100)];
[self addSubview:firstView];

UIButton *button = [[UIButton alloc] initWithFrame:firstView.bounds];
[firstView addSubview:button];

要获取firstView的宽度/高度，你可以这样做：

CGSize size = firstView.bounds.size;
NSInteger width = size.width;
NSInteger height = size.height;