UIPickerView 的日期仅向一个方向旋转

发布于 2024-09-27 14:46:59 字数 1178 浏览 0 评论 0原文

我在使用 UIPickerView 时遇到了奇怪的行为：

我试图在操作表中显示日期选择器。一切正常，除了轮子一开始只向一个方向旋转！

如果您开始向上旋转并将方向更改为向下 - 它会起作用。但是当您尝试开始向下旋转时，拾取器不会移动。

这是我的代码：

UIActionSheet *menu = [[UIActionSheet alloc] initWithTitle:@"Date Picker" 
                                                  delegate:self
                                         cancelButtonTitle:@"Abbrechen"
                                    destructiveButtonTitle:nil
                                         otherButtonTitles:@"Auswählen",nil];    
    // Add the picker
    UIDatePicker *tmpPickerView = [[UIDatePicker alloc] init];
    tmpPickerView.datePickerMode = UIDatePickerModeDate;

    [tmpPickerView addTarget:self
    action:@selector(pickerChanged:)
    forControlEvents:UIControlEventValueChanged]; 

    [menu addSubview:tmpPickerView];              
    [menu showInView:self];        

    CGRect menuRect = menu.frame;
    menuRect.origin.y -= 214;
    menuRect.size.height = 300;
    menu.frame = menuRect;

    CGRect pickerRect = pickerView.frame;
    pickerRect.origin.y = 174;
    pickerView.frame = pickerRect;

    [tmpPickerView release];    
    [menu release];

原文

I am experiencing a strange behavior with a UIPickerView:

I am trying to show an Date Picker within an action sheet.
Everything works well, except that the wheels are only rotating in one direction at first!

If you start rotating up and change the direction to down - it works. But when you try to start rotating down, the picker won't move.

Here is my code:

UIActionSheet *menu = [[UIActionSheet alloc] initWithTitle:@"Date Picker" 
                                                  delegate:self
                                         cancelButtonTitle:@"Abbrechen"
                                    destructiveButtonTitle:nil
                                         otherButtonTitles:@"Auswählen",nil];    
    // Add the picker
    UIDatePicker *tmpPickerView = [[UIDatePicker alloc] init];
    tmpPickerView.datePickerMode = UIDatePickerModeDate;

    [tmpPickerView addTarget:self
    action:@selector(pickerChanged:)
    forControlEvents:UIControlEventValueChanged]; 

    [menu addSubview:tmpPickerView];              
    [menu showInView:self];        

    CGRect menuRect = menu.frame;
    menuRect.origin.y -= 214;
    menuRect.size.height = 300;
    menu.frame = menuRect;

    CGRect pickerRect = pickerView.frame;
    pickerRect.origin.y = 174;
    pickerView.frame = pickerRect;

    [tmpPickerView release];    
    [menu release];

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葬﹪忆之殇 2024-10-04 14:46:59

问题是 UIDatePicker 超出了 UIActionSheet 的范围，如果设置

menu.clipsToBounds = YES; ，

您可以看到它为了适当地调整大小，请将框架调整大小代码更改为

CGRect pickerRect = tmpPickerView.frame;
CGRect menuRect = menu.frame;

pickerRect.origin.y = menuRect.size.height;
menuRect.size.height = menuRect.size.height + pickerRect.size.height;
menuRect.origin.y = menuRect.origin.y - pickerRect.size.height;

menu.frame = menuRect;    
tmpPickerView.frame = pickerRect;

The problem is that the UIDatePicker is extending beyond the bounds of the UIActionSheet, which you can see if you set

menu.clipsToBounds = YES;

In order to resize things appropriately, change your frame resizing code to

CGRect pickerRect = tmpPickerView.frame;
CGRect menuRect = menu.frame;

pickerRect.origin.y = menuRect.size.height;
menuRect.size.height = menuRect.size.height + pickerRect.size.height;
menuRect.origin.y = menuRect.origin.y - pickerRect.size.height;

menu.frame = menuRect;    
tmpPickerView.frame = pickerRect;

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