HI. I need to write some text over a custom button. So I subclassed UIButton. In -drawrect, I write the text I need. The problem is that the text ends up under the button. After I write my text, UIButton's drawrect goes ahead and draws on top of me.
I am not even calling [super drawrect: rect] even though I was anticipating calling it before I did my drawing. It seems that UIButton's drawrect will get called regardless.
Any ideas? Thanks.
解决方案
As other people have said, you don't need to subclass UIButton - infact it's best not to as UIButton is pretty complex (as you found). You have three options:
Leave the button's title blank and add a new text field to the button at the position you want.
if you are using 3.0 access the button's label property. Although the label itself is read only its properties (including frame) are not.
Sub-class UIControl. UIControl is a UIView so you can add other views - text and images and it is UIView that implements the action message behaviour (addTarget:action:forControlEvents:). UIButton implements statefulness on top of this.
If you don't need things like UIButton's setTitle:forState: and associated functionality but you are using a lot of these controls I would use the third option. Otherwise use the first (or second if you are on 3.0).