移动动画
//在block块中进行移动，偏移
[UIView animateWithDuration:0.3 animations:^{
}];
转场动画
//这是添加View时，不显得突兀。比如jian'ru
self.popView.alpha = 0;
[self.view addSubview:self.popView];
//这是转场动画
[UIView transitionWithView:self.popView duration:0.1 options:UIViewAnimationOptionCurveEaseInOut animations:^{
self.popView.alpha = 1;
} completion:^(BOOL finished) {}];
