How to add a UIButton to a UIButton

Question

How do I add a UIButton on top of a UIButton?

Such that if I move the the parent UIButton the one on top moves as well.

Answer 1

UIButton *testButton = [UIButton buttonWithType:UIButtonTypeCustom];
testButton.backgroundColor = [UIColor redColor];

UIButton *smallerButton = [UIButton buttonWithType:UIButtonTypeCustom];
smallerButton.backgroundColor = [UIColor greenColor];
[testButton addSubview:smallerButton];

[self.view addSubview:testButton];

Answer 2

[oneButton addSubview:otherButton];

请记住， UIButton是UIView的子类......

Answer 3

UIButton *parentBtn;
UIButton *childBtn;

parentBtn = [UIButton buttonWithType: // init the button];
childBtn = //same for child btn

[self.view addSubview:parentBtn]; //add the parent button to the view
[parentBtn addSubview:childBtn]; //add the child button on top of the parent button