How to reference a UILabel that was added through code so I can update position when iPad is rotated?

Question

I added a UILabel subview using code. When the user rotates the iPad, I want to be able to tell that UILabel to shift its position to accomodate the new screen orientation.

I think I need to put my code in the willAnimateRotationToInterfaceOrientation function. I want to be able to get at my UILabel and I see sample code that looks like the following to retrieve a reference to a subview: UILabel *myLabel = (UILabel *) [self.subviews objectAtIndex:0];

How do I know what index my UILabel is at? The sample code seems to know that their subview is the first one (index 0).

Is there a way for me to find out what my UILabel's index is?

Is there another way to keep a reference to this UILabel that I create in code? If I made myLabel a variable of the class, will I be able to reference

Answer 1

Generally, in your UIViewController, you'd have an instance variable that was a pointer to your UILabel. Then you can access it anywhere in your controller's code.

Answer 2

可以将其放在实例变量中（我喜欢这样，因为它允许您为视图赋予漂亮的名称），或者设置其tag属性，以便您可以通过[self.view viewWithTag:myTag]再次找到它（标签只是您为视图分配的编号，以供以后查找之用。

Answer 3

还有另一种可能性不是这样做，而是设置一个autoresizingMask ，使其（例如）粘在左上角。