iPad uiview frame changes right after initWithFrame

Question

Okay so i have a very basic app with a view in it with one button. i have the controller set to only allow landscape. My problem is that after it is initialized, and then i click my button (which only has a log statement) , is different than the log statements i have at the end of my init.

I start the app in landscape mode on my simulator (same results on device though). Its like once i assign it , it just switches back. I tried this statement self.frame = CGRectMake(0, 0, 1024, 768);in my buttonClicked method, but that just distorted and shifted it.

- (id)initWithFrame:(CGRect)frame 
{
    if ((self = [super initWithFrame:frame])) 
    {
    //BUTTONS
    attributesButton = [UIButton buttonWithType:UIButtonTypeCustom];
    attributesButton.frame = CGRectMake(self.frame.size.width - buttonPadding - 35, self.frame.size.height/2 -22 -150, 35, 35);
    [attributesButton setBackgroundImage:[UIImage imageNamed:@"loadIcon.png"] forState:UIControlStateNormal];
    [attributesButton addTarget:self action:@selector(attributesButtonClicked) 
               forControlEvents:UIControlEventTouchUpInside];
    [attributesButton setTitle:@"Attr" forState:UIControlStateNormal];
    [self addSubview:attributesButton];
    NSLog(@"Width: %f",self.frame.size.width);
    NSLog(@"Height: %f",self.frame.size.height);
    }
    return self;
}

-(void)attributesButtonClicked
{
    NSLog(@"Width: %f",self.frame.size.width);
    NSLog(@"Height: %f",self.frame.size.height);
}

So that is my init. Sorry it looks so terrible im not sure why. My view controller:

    - (void)loadView 
{
    NSLog(@"myViewController: loadView");

    myView = [[myView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];

    self.view = myView;

}

Now this is the part that gets me, the log statements.

2010-08-27 15:16:55.242 tester[8703:40b] myViewController: loadView
2010-08-27 15:16:55.262 tester[8703:40b] Width: 1024.000000
2010-08-27 15:16:55.262 tester[8703:40b] Height: 768.000000
CLICK MY BUTTON HERE
2010-08-27 15:17:05.689 tester[8703:40b] Width: 748.000000
2010-08-27 15:17:05.689 tester[8703:40b] Height: 1024.000000

Answer 1

If your view is tied to one of the standard view controllers (UINavigationController, UITabBarController, ...), the controller will update the frame size at runtime, no matter what you specify in initWithFrame.

That's actually a good thing, because you don't have to worry about orientation, toolbars taking up space, etc.

Answer 2

that's probably because the view is being autoresized by the parent view when you add it as a subview. If you don't want that to happen (though you'd usually do for a fullscreen view) you can set the autoresizingMask to UIViewAutoresizingNone:

- (id)initWithFrame:(CGRect)frame 
{
    if ((self = [super initWithFrame:frame])) 
    {
        ...
        self.autoresizingMask = UIViewAutoresizingNone;
    }
    return self;
}

EDIT: ok, sorry, I just remembered that UIViewAutoresizingNone is actually the default value for autoresizingMask, so setting it to that value during initialization won't actually change anything. But the point is that the frame is changed by the superview when you add your view as a subview.