网页开发中年跑马灯的<marquee>代码是经常用到的，一般用来提示或者消息等。在iOS的开发中，我们或许也会用到这种效果。下面就是iOS中实现跑马灯效果的代码片段：
[labelShow sizeToFit];
CGRect frame = labelShow.frame;
frame.origin.x = 320;
labelShow.frame = frame;
[UIView beginAnimations:@"testAnimation" context:NULL];
[UIView setAnimationDuration:8.8f];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];
[UIView setAnimationDelegate:self];
[UIView setAnimationRepeatAutoreverses:NO];
[UIView setAnimationRepeatCount:999999];
frame = labelShow.frame;
frame.origin.x = -frame.size.width;
labelShow.frame = frame;
[UIView commitAnimations];