跑马灯

OS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];