Question

Here is my problem, I add a subview to my container view while container view‘s size is (0,0), I want my subview has fixed margin length is 4(top,right,left,bottom) in my container view. Can I achieve this goal without custom my layOutSubviews method.
My code is like is

- initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        mySubview = [[UIView alloc] init];
        //how to code here????
        [myContainerView addSubview:mySubview];
    }
    return self;
}

Answer 1

In iOS 6, you should be able to do this with constraints, but prior to iOS 6, I do not recommend adding subviews prior to having a non-zero frame, or if you do, I recommend using layoutSubviews to fix it. It’s just not possible to have a 4-point margin inside of a zero-sized box, so it’s never going to autosize correctly using springs and struts.