Centering a label in a UIView

Question

What\'s the best way to center a label in a UIView? If you do something such as

UILabel *myLabel = [[UILabel alloc] initWithFrame:CGRectMake(view.fr         


        

Answer 1

The main thing you are doing wrong is taking half the origin values, rather than half the sizes

However, you don't need to even calculate that in this case - just do something like the following:

UIView *aView = [[[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]] autorelease];
aView.backgroundColor = [UIColor darkGrayColor];

UILabel *aLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 125, 30)];
aLabel.center = aView.center;

(note, you don't need to force those coordinates to floats - in this case writing them as ints seems more readable).

Also, it's a matter of style - but since you're already using property syntax (aView.backgroundColor) you may as well use it for the center property too :-)

Answer 2

To position any child horizontally centered in a parent you would calculate its position like so;

childX = (parentWidth - childWidth) / 2

(This also applies to height).