iOS: UIButton resize according to text length

If your button was made with Interface Builder, and you're changing the title in code, you can do this:

[self.button setTitle:@"Button Title" forState:UIControlStateNormal];
[self.button sizeToFit];

The way to do this in code is:

[button sizeToFit];

If you are subclassing and want to add extra rules you can override:

- (CGSize)sizeThatFits:(CGSize)size;

In UIKit, there are additions to the NSString class to get from a given NSString object the size it'll take up when rendered in a certain font.

Docs was here. Now it's here under Deprecated.

In short, if you go:

CGSize stringsize = [myString sizeWithFont:[UIFont systemFontOfSize:14]]; 
//or whatever font you're using
[button setFrame:CGRectMake(10,0,stringsize.width, stringsize.height)];

...you'll have set the button's frame to the height and width of the string you're rendering.

You'll probably want to experiment with some buffer space around that CGSize, but you'll be starting in the right place.