iOS文字上下滚动效果什么实现？

Question

iOS中一个label中文字上下滚动如何实现?
比如说下图所示的 今日头条右边的文字实现轮播。

Answer 1

[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];