学步园

iPhone的控件背景在某些时候显得单调,为此我们需要改变它.

以UIAlertView为例:

UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:@"标题"<br /> message: @"消息!"<br /> delegate:nil<br /> cancelButtonTitle:@"取消"<br /> otherButtonTitles:@"确定",nil] autorelease];<br /> [alert show];<br /> UIImage *theImage = [UIImage imageNamed:@"loveChina.png"];<br /> theImage = [theImage stretchableImageWithLeftCapWidth:0. topCapHeight:0.];<br /> CGSize theSize = [theAlert frame].size;</p> <p> UIGraphicsBeginImageContext(theSize);<br /> [theImage drawInRect:CGRectMake(0, 0, theSize.width, theSize.height)];<br /> theImage = UIGraphicsGetImageFromCurrentImageContext();<br /> UIGraphicsEndImageContext();<br /> theAlert.layer.contents = (id)[theImage CGImage];

并添加QuartzCore引用.