底部弹出UIPicker？ [英] Bottom pop-up UIPicker?

问题描述

当一个动作被调用时，UIPicker是从屏幕底部弹出的，只是一个以某种方式协调的基本UIPickerView？ （就像UIActionSheet？）我将如何实现？

Is the UIPicker that pops up from the bottom of the screen when an action is called just a basic UIPickerView that is coordinated in a certain way? (Like a UIActionSheet?) How would I implement that?

推荐答案

这是我使用的动画代码：

Here's animation code, that I use:

- (void)animateDatePicker:(BOOL)show {
    CGRect screenRect = self.frame;
    CGSize pickerSize = [self.datePickerView sizeThatFits:CGSizeZero];
    CGRect startRect = CGRectMake(0.0,
                                  screenRect.origin.y + screenRect.size.height,
                                  pickerSize.width, pickerSize.height);

    CGRect pickerRect = CGRectMake(0.0,
                                   screenRect.origin.y + screenRect.size.height - pickerSize.height,
                                   pickerSize.width,
                                   pickerSize.height);

    self.datePickerView.frame = pickerRect;
    self.backgroundColor = UIColorMakeRGBA( 64, 64, 64, 0.7f - (int)show * 0.7f );

    if ( show ) {
        self.datePickerView.frame = startRect;
        [self.parentViewController addSubviewToWindow:self];
    }

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.3f];
    [UIView setAnimationDelegate:self];

    self.backgroundColor = UIColorMakeRGBA( 64, 64, 64, 0.0f + (int)show * 0.7f );

    if ( show ) {
        self.datePickerView.frame = pickerRect;
    } else {
        [UIView setAnimationDidStopSelector:@selector(slideDownDidStop)];
        self.datePickerView.frame = startRect;
    }

    [UIView commitAnimations];  
}

datePickerView是一个包含DatePicker的视图：

datePickerView is a view, that contains DatePicker:

self.datePickerView = [[UIView alloc] initWithFrame:CGRectMake(0.0, 174.0, 320.0, 286.0)];
self.datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0.0, 70.0, 320.0, 216.0)];
[self.datePicker setDatePickerMode:UIDatePickerModeDate];
[self.datePicker addTarget:self action:@selector(pickerValueChanged:) forControlEvents:UIControlEventValueChanged];
[self.datePickerView addSubview:self.datePicker];

parentViewController应该实现addSubviewToWindow方法：

parentViewController should implement addSubviewToWindow method:

- (void)addSubviewToWindow:(UIView *)addView {
    [self.view addSubview:addView];
}

UIColorMakeRGBA：

UIColorMakeRGBA:

#define UIColorMakeRGBA(nRed, nGreen, nBlue, nAlpha) [UIColor colorWithRed:(nRed)/255.0f green:(nGreen)/255.0f blue:(nBlue)/255.0f alpha:nAlpha]

slideDownDidStop是一种方法，将在datePicker成功滑下后调用。

slideDownDidStop is a method, that will be called after datePicker slide down successfully.

所以，总结一下 - 你有MyViewController，它有

So, just to summarize - you have MyViewController, that have

MyDatePickerView *myDatePicker;

字段。

MyDatePickerView是一个自定义class，有UIDatePicker * datePicker字段，MyViewController * parentViewController和animateDatePicker方法。

MyDatePickerView is a custom class, that have UIDatePicker *datePicker field, MyViewController *parentViewController and animateDatePicker method.

当你在MyViewController上执行某些操作时（例如，某些按钮的UIControlEventTouchUpInside），你应该调用

When you perform some action on MyViewController (for example, UIControlEventTouchUpInside for some button), you should invoke

[myDatePicker animateDatePicker:YES];

如果您有任何疑问，请与我们联系。

Please let me know if you have questions.

更新：
这是一个小的示例 。

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