我正在尝试在 iPad 上显示一个 UIPickerView 的 UIPickerView，我有适用于 iPhone 的等效代码，所以我的 UIPickerView 委托(delegate)和数据源的东西工作，但在 iPad 上，当我使用 -[UIActionSheet showFromRect:inView:animated:] 结果 UIPopover/UIActionSheet太小了，我似乎无法设置框架大小，也没有显示任何按钮。

我不知道这是因为他们在边界之外还是有其他事情发生。这是我删除所有非必要代码(iPhone 等)后代码的样子。有没有人知道我做错了什么，有没有人知道任何例子。

CGRect thePickerFrame = CGRectMake(0, 0, 320.0, 485.0);
UIPickerView * thePickerView = [[UIPickerView alloc] initWithFrame:thePickerFrame];

[pickerActionSheet release], pickerActionSheet =
        [[UIActionSheet alloc] initWithTitle:@"Choose" delegate:self 
                               cancelButtonTitle:@"Cancel"
                               destructiveButtonTitle:nil
                               otherButtonTitles:@"Next", nil];
thePickerView.showsSelectionIndicator = YES;
thePickerView.dataSource = self;
thePickerView.delegate = self;

[pickerActionSheet addSubview:thePickerView];
[thePickerView selectRow:0 inComponent:0 animated:NO];
[thePickerView release];

[pickerActionSheet showFromRect:currentTextField.bounds
                             inView:currentTextField animated:NO];
pickerActionSheet.frame = thePickerFrame;

最佳答案

我认为 UIActionSheet 不可调整大小，请尝试在您的代码中用 [pickerActionSheet addSubview:thePickerView]; 注释行，您会看到 ActionSheet 非常适合按钮。

我会推荐一个带有自定义 UIViewController 的 UIPopoverController。像这样:

UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
toolbar.barStyle = UIBarStyleDefault;

UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithTitle:@"back" style:UIBarButtonItemStyleBordered target:self action:@selector(BACK_ACTION:)];
UIBarButtonItem *chooseButton = [[UIBarButtonItem alloc] initWithTitle:@"Choose" style:UIBarButtonItemStylePlain target:nil action:nil];
UIBarButtonItem *nextButton = [[UIBarButtonItem alloc] initWithTitle:@"Next" style:UIBarButtonItemStyleBordered target:self action:@selector(NEXT_ACTION:)];
UIBarButtonItem *fixed1 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *fixed2 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];

[toolbar setItems:[NSArray arrayWithObjects:cancelButton, fixed1, chooseButton, fixed2, nextButton, nil]];

UIPickerView    *thePickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 44, 320, 216)];
CGRect thePickerFrame = thePickerView.frame;
thePickerFrame.origin.y = toolbar.frame.size.height;
[thePickerView setFrame:thePickerFrame];


UIView *view = [[UIView alloc] init];
[view addSubview:thePickerView];
[view addSubview:toolbar];

UIViewController *vc = [[UIViewController alloc] init];
[vc setView:view];
[vc setContentSizeForViewInPopover:CGSizeMake(320, 260)];

popover = [[UIPopoverController alloc] initWithContentViewController:vc];

thePickerView.showsSelectionIndicator = YES;
thePickerView.dataSource = self;
thePickerView.delegate = self;

[thePickerView selectRow:0 inComponent:0 animated:NO];

[popover presentPopoverFromRect:currentTextField.bounds inView:currentTextField permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

其中popover是在.h中声明的类变量(UIPopoverController *popover;)。

对了，我用的是ARC，所以代码里没有release。

关于objective-c - iPad 框架上的 UIActionSheet 太小，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7974475/