how to change height of uiview defined in storyboard

Question

Update: I ended up implementing the code below into it's own method and then called it from viewDidLayoutSubviews and willAnimateRotationToInterfaceOrientation . Doing it from viewDidAppear (as suggested) would not resize the view when returning from a segue.

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I have a UIView defined in a storyboard which I'm using for a header view on my UIViewController. I have a constant in my code for all header views to be 80 units high. I have a tag on the storyboard header view of 200. I thought I could use this tag to get the view, modify the height of the underlying CGRect, and then re-set the header view to the modified CGRect. That doesn't seem to affect the height however. What am I missing?

- (void)viewDidLoad
{
   UIView *header = [self.view viewWithTag:200];
   CGRect hrect = [header frame];
   hrect.size.height = HEADER_HEIGHT;
   [header setFrame:hrect];
 ...

Answer 1

尝试在viewDidAppear上执行此操作，然后调用

[self setNeedsLayout]

Answer 2

The problem is that you're using the tag as an NSString. The tag property is an NSInteger. Try doing the following:

- (void)viewDidLoad
{
    UIView *header = [self.view viewWithTag:200];// give the tag as an int
    CGRect hrect = [header frame];
    hrect.size.height = HEADER_HEIGHT;
    [header setFrame:hrect];
...

Also, make sure the tag you defined in the Storyboard is also 200 and not @"200".

Hope this helps!