弹出 ：
UIWindow *window = [[[UIApplication sharedApplication] delegate] window];
[windowaddSubview:self];
[UIView animateWithDuration:0.25
delay:0 options:UIViewAnimationOptionCurveEaseOut
animations:^{
CGRectframe =self.backView.frame;
frame.origin.y= frame.origin.y- frame.size.height;
self.backView.frame= frame;
}completion:^(BOOLfinished) {
}];
退出：
[UIView animateWithDuration:0.25 delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^{
CGRectframe =self.backView.frame;
frame.origin.y= frame.origin.y+ frame.size.height;
self.backView.frame= frame;
self.alpha=0;
}completion:^(BOOLfinished) {
[self removeFromSuperview];
}];
