使用CGRectMake重绘UIButton不会更新UIButton位置吗？

Question

I'm trying to update the position and size of several UIButtons in my app by using:

-(void)viewDidAppear:(BOOL)animated {
    _UIButton1.frame = CGRectMake(-7, 35, 212, 77);
    _UIButton2.frame = CGRectMake(139, 149, 290, 77);
    // And so on for several more buttons
}

However, when I use this code, these buttons just appear at wherever the location is set on the Storyboard, not where I'm setting it programmatically. How would I make these buttons appear at a location this is different than the one I have set in my Storyboard?

Answer 1

Open your storyboard file and make sure the right pane is showing the Utilities menu, then uncheck Use Auto Layout .

When Auto Layout is enabled, you have to set constraints on your views and create outlets to those constraints to move things around with code. If you want to work directly with frames, Auto Layout needs to be turned off. It has to be one or the other.

Auto Layout can be great, but it's hard to make a recommendation without knowing more about what you are trying to achieve.

Answer 2

Please update frame in -(void) viewWillAppear method as in viewDidAppear your view is practically set and is ready to displayed. after updating your button's frame please use following line of code

[self.view laoutIfNeeded];

Thanks