问题
I have encountered some seriously odd situation.
I have a code looking like this:
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
with the view controller looking like this:
Strangely enough, when I ONLY ADD
- (void)viewDidAppear:(BOOL)animated {
}
even WITHOUT any action inside, it totally messes up with the layout of the view controller and makes it look like this:
I have not added any other line of code then just empty header for viewDidAppear. When deleted, the layout is OK. What the heck is happening here?
回答1:
Your view will change size after viewDidLoad with regard to the status bar and navigation bar (if you have them). If you don't call [super viewDidAppear:animated];, your subviews may not be repositioned properly.
来源：https://stackoverflow.com/questions/18536858/viewdidappear-presence-in-code-messes-with-layout