iOS开发--UIPickerView的动画效果

- (void)ViewAnimation:(UIView*)view willHidden:(BOOL)hidden {

[UIView animateWithDuration:0.3 animations:^{
if (hidden) {
view.frame = CGRectMake(0, [UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width, view.bounds.size.height);
} else {
[view setHidden:hidden];
view.frame = CGRectMake(0, [UIScreen mainScreen].bounds.size.height - view.bounds.size.height, [UIScreen mainScreen].bounds.size.width, view.bounds.size.height);
}
} completion:^(BOOL finished) {
[view setHidden:hidden];
}];
}