效果图
原理
就是持有两个视图，并且两个视图同时改变origin.y
动画结束之后，判断哪个视图是在上面并且看不到的，
则将该视图移动到底部，并且该视图展示下一跳内容
在开始下一轮动画
代码
- (void)startAnimationWithDuration:(CGFloat)duration
{self.duration = duration;[self changeAnimation];
}- (void)changeAnimation
{CGRect rect1 = self.label1.frame;CGPoint point1 = rect1.origin;point1.y -= CGRectGetHeight(self.bounds);rect1.origin = point1;CGRect rect2 = self.label2.frame;CGPoint point2 = rect2.origin;point2.y -= CGRectGetHeight(self.bounds);rect2.origin = point2;self.currentIndex = (self.currentIndex + 1)%self.titleArray.count;NSString *crrentTitle = self.titleArray[self.currentIndex];[UIView animateWithDuration:0.5 animations:^{self.label1.frame = rect1;self.label2.frame = rect2;} completion:^(BOOL finished) {if (CGRectGetMinY(self.label1.frame) < - CGRectGetHeight(self.bounds) / 2) {self.label1.frame = self.bottomRect;self.label1.text = crrentTitle;} else {self.label2.frame = self.bottomRect;self.label2.text = crrentTitle;}}];[self performSelector:@selector(changeAnimation) withObject:nil afterDelay:3.5];
}demo
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