iphone - 底部弹出UIPicker？

Question

调用action时从屏幕底部弹出的UIPicker只是一个以某种方式协调的基本UIPickerView吗？ (像 UIActionSheet 一样？)我将如何实现它？

Answer 1

这是我使用的动画代码:

- (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 View ，包含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:

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

UIColorMakeRGBA:

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

slideDownDidStop是一个方法，当datePicker下滑成功后会调用该方法。

所以，总结一下 - 你有 MyViewController，它有

MyDatePickerView *myDatePicker;

字段。

MyDatePickerView 是一个自定义类，具有 UIDatePicker *datePicker 字段、MyViewController *parentViewController 和 animateDatePicker 方法。

当您在 MyViewController 上执行某些操作(例如，某些按钮的 UIControlEventTouchUpInside)时，您应该调用

[myDatePicker animateDatePicker:YES];

如果您有疑问，请告诉我。

更新:这是一个小example .