Question

On iPad following is offscreen when in portrait, why this even when starting up in portrait?

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIView* imageView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
    blue.backgroundColor = [UIColor blueColor];
    [[self view] addSubview:imageView];

I have been told that the root view’s frame is always the same in portrait and landscape:
– portrait frame orign(x i representing the orign of an UIView)
x0
00
00

Landscape frame orign:
000
x00

But why is CGRectMake(0,0 .. not up in the right corner in portrait?

Thanks in advance

Answer 1

The bounds and the frame can change when you rotate the device. Let’s take a Single View Application template as an example, add orientation support and run it on the iPhone. In portrait:

bounds = (0, 0, 320, 460) // 460 compensates for 20p status bar
frame = (0, 20, 320, 460) // status bar adjustment
x0
00
00

In landscape:

bounds = (0, 0, 480, 300) // now 20p is taken from "height"
frame = (20, 0, 300, 480) // status bar adjustment
x00
000

Origin is always top-left corner, regardless of orientation.