IOS动画的使用方法总结－下拉框的简单实现

CATransition *transition = [CATransition animation];
transition.duration = 0.4f;//时间
transition.type = kCATransitionPush;//动画的效果
transition.subtype = kCATransitionFromBottom;//动画的目的地
[self.view addSubview:_backGroundView];//这是是自己要做的事情一般是添加一个View 这个需要自己写
[self.view.layer addAnimation:transition forKey:@"animation"];

[UIView beginAnimations:@"animation" context:nil];
[UIView setAnimationDuration:2.0f];//时间
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];//效果
[UIView setAnimationTransition:UIViewAnimationTransitionNone forView:self.view cache:YES];
[self.view addSubview:_backGroundView];//要做的事情
[UIView commitAnimations];

[UIView animateWithDuration:1.0 animations:^{
_backGroundView.frame = CGRectMake(0, originY, _screenSize.width, 0);//要达到的状态值
}completion:^(BOOL finished){
[_backGroundView removeFromSuperview];
}];