如何相对于其他UI元素(以及自定义视图/控件)添加标签?
You should operate on frame property (eg. put label at bottom of the button):
CGRect buttonRect = self.myButton.frame;
buttonRect.origin.y = buttonRect.origin.y + buttonRect.size.height;
UILabel *lbl = createALabel();
lbl.frame = buttonRect;
[self.myButton.superview addSubView:lbl];
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