UIPickerView动画开启和关闭屏幕行为

Question

这是这个问题的延续

CGRectMake : How To Calculate X and Y For UIPickerView Animation?

由https://stackoverflow.com/users/2315974/danypata

回答

我有一个选择器视图，我想在按下按钮时在屏幕上和屏幕上显示动画，并使用上一个问题/答案中的代码我已经让它在第一次按下按钮时在屏幕上显示动画。

第二个按钮被按下它只是消失然后第三次被按下它动画到错误的地方...请帮助

代码

if (self.pickerSort.hidden == NO) {


    [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionBeginFromCurrentState animations:^{
        self.pickerSort.frame = CGRectMake(0,self.view.frame.size.height
                                           +  self.pickerSort.frame.size.height,-self.pickerSort.frame.size.width,-self.pickerSort.frame.size.height);
    }
                     completion:^(BOOL finished) {
                     }];
    self.pickerSort.hidden = YES;
   // [self performSelector:@selector(hidePicker) withObject:nil afterDelay:1];

} else if (self.pickerSort.hidden == YES) {

    self.pickerSort.hidden = NO;

    [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionBeginFromCurrentState animations:^{
        self.pickerSort.frame = CGRectMake(0 ,
                                       self.view.frame.size.height
                                       -  self.pickerSort.frame.size.height,
                                       self.pickerSort.frame.size.width,
                                       self.pickerSort.frame.size.height);
    }
                     completion:^(BOOL finished) {
                     }];
    [self.view bringSubviewToFront:self.pickerSort];

图像中的行为 - 按钮将动画精美地按到屏幕上

第二次按它消失，没有动画

第三次按动画到这里

任何帮助都会很棒......我正在寻找的功能是如何将选择器视图放回到动画上，这样第3次按下就像第一次一样

Answer 1

请尝试使用以下代码。

    self.pickerSort.hidden = NO;
    NSTimeInterval duration = 0.5;
    [UIView animateWithDuration:duration
                          delay:0
                        options:UIViewAnimationOptionCurveLinear
                     animations:^{
                         CGRect pickerFrame = self.pickerSort.frame;

                         // currently picker is off the screen, show it.
                         if (pickerFrame.origin.y == self.view.frame.size.height) {
                             // set frame to show picker
                             pickerFrame.origin.y = self.view.frame.size.height - self.pickerSort.frame.size.height;
                         } else {
                             // set frame to hide picker
                             pickerFrame.origin.y = self.view.frame.size.height;
                         }
                         self.pickerSort.frame = pickerFrame;
                     }
                     completion:^(BOOL finished) {
                         self.pickerSort.hidden = YES;
                     }];

Answer 2

在玩完这个并学习框架和CGRects的来龙去脉之后，我通过使用以下代码实现了这个目标

  if (pickerSort.hidden == YES) {
    [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionBeginFromCurrentState animations:^{
        pickerSort.hidden = NO;

        visualEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
        [self.tableStations addSubview:visualEffectView];
        pickerSort.frame = CGRectMake(0,0,originalPickerFrame.size.width,originalPickerFrame.size.height);
        visualEffectView.frame = CGRectMake(0,0,originalPickerFrame.size.width,originalPickerFrame.size.height - 64);
    }
                     completion:^(BOOL finished) {

                         self.navigationController.navigationItem.leftBarButtonItem.enabled = NO;

                     }];
}
else
{
    visualEffectView.hidden = YES;
    [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionBeginFromCurrentState animations:^{

        pickerSort.frame = CGRectMake(0,-originalPickerFrame.size.height,0,0);
    }
                     completion:^(BOOL finished) {

                         self.navigationController.navigationItem.leftBarButtonItem.enabled = YES;
                         pickerSort.hidden = YES;

                     }];
}

我在viewDidLoad中设置了原始帧大小，如此

 pickerSort = [[UIPickerView alloc]initWithFrame:CGRectMake(0.0, 0.0, self.view.frame.size.width, self.view.frame.size.height)];
originalPickerFrame = pickerSort.frame;

pickerSort.frame = CGRectMake(0,-originalPickerFrame.size.height,0, 0);

希望这可以帮助将来的某个人