// 方法一
CATransition *animation = [CATransition animation];
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
animation.type = kCATransitionFade;
animation.duration =0.75;
[self.label.layer addAnimation:animation forKey:@"kCATransitionFade"];
self.label.text =@"New";
// 方法二
[UIView transitionWithView:self.label
duration:0.25f
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^{
self.label.text =@"Well done!";
} completion:nil];
// 方法三
[UIView animateWithDuration:1.0
animations:^{
self.label.alpha =0.0f;
self.label.text =@"newText";
self.label.alpha =1.0f;
}];
