iOS Component is automatically resizing but I don't know where and why

Question

I am using this control (RDVCalendarView) and I want to little customize it. I want to change height of calendar so it wouldn't be height as whole controller but little smaller. So in loadView I change code to this:

CGRect applicationFrame = [[UIScreen mainScreen] applicationFrame];
applicationFrame.size.height = 200;

_calendarView = [[RDVCalendarView alloc] initWithFrame:applicationFrame];
[_calendarView setAutoresizingMask:UIViewAutoresizingNone];
[_calendarView setSeparatorStyle:RDVCalendarViewDayCellSeparatorTypeHorizontal];
[_calendarView setBackgroundColor:[UIColor whiteColor]];
[_calendarView setDelegate:self];
self.view = _calendarView;

In whole initWithFrame method of RDVCalendarView there is correct size of height which I set. But after viewWillAppear there is layoutSubviews call and has 504 size of height. I don't know what happens but it looks like height is autoresizing to height of controller. I just don't know where it could be. Thanks for help

Answer 1

Usually you don't directly set the frame of a UIViewController's main view, see https://developer.apple.com/library/ios/featuredarticles/ViewControllerPGforiPhoneOS/AdoptingaFull-ScreenLayout/AdoptingaFull-ScreenLayout.html

Instead, you simply add the view you want to resize as a subview to your view controller's root view. To do that, simply change the method from loadView to viewDidLoad. At that point, the system has already created a default UIView for you and assigned it to the view controller's view property.

Change your code to this:

- (void)viewDidLoad {
    CGRect calendarFrame = self.view.frame;
    calendarFrame.size.height = 200;

    _calendarView = [[RDVCalendarView alloc] initWithFrame:calendarFrame];
    [_calendarView setAutoresizingMask:UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight];
    [_calendarView setSeparatorStyle:RDVCalendarViewDayCellSeparatorTypeHorizontal];
    [_calendarView setBackgroundColor:[UIColor whiteColor]];
    [_calendarView setDelegate:self];

    [self.view addSubview:_calendarView];
}

That should do the trick.