Ios 如何在按下背景时设置隐藏选择器视图的动画

如何在点击背景时设置隐藏选择器视图的动画？我试过这个：

[self.picker setHidden:YES];

但是拾荒者突然消失了。我希望它在屏幕外向下设置动画。 注意：我知道如何实现点击背景以消失帖子的一部分，所以请忽略它

[UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.3f]; // you can set value as per you need.
    [self.picker setHidden:YES];
    [UIView commitAnimations];

---

这会将拾取器滑到底部，然后在动画结束时将其隐藏。

不能添加CGPoint和CGFloat。这段代码甚至无法编译。

[UIView animateWithDuration:0.3 animations:^{
     self.picker.frame = CGRectMake(self.picker.frame.origin.x,self.picker.frame.origin.y+self.picker.frame.size.height,self.picker.frame.size.width,self.picker.frame.size.height);
}completion:^(BOOL fin) {

}];

[UIView animateWithDuration:0.3 animations:^{
    self.picker.center = CGPointMake(self.picker.center.x, self.picker.center.y + self.picker.frame.size.height);
} completion:^(BOOL finished){
    self.picker.hidden = YES;
}];