在iPad上使用UIActionSheet的问题

Question

我正在为iPhone和iPad制作一个兼容的应用程序,我在动作表中显示了一个选择器,如下所示:

actionSheet = [[UIActionSheet alloc] initWithTitle:@"Day / Month"
                                          delegate:self
                                 cancelButtonTitle:nil
                            destructiveButtonTitle:nil
                                 otherButtonTitles:nil];

picker = [[UIPickerView alloc] initWithFrame:CGRectMake(0,40,0,0)];
picker.delegate = self;
picker.showsSelectionIndicator = YES;
[actionSheet addSubview:picker];

[actionSheet showInView:[UIApplication sharedApplication].keyWindow];
[actionSheet setBounds:CGRectMake(0,0,320,469)];

这适用于iPhone,但对于具有相同代码的iPad版本,除了那些不同尺寸的人给我以下错误:

*由于未捕获的异常'NSInternalInconsistencyException'而终止应用程序,原因:'无效的参数不满足:view!= nil'

在这一行:

[actionSheet showInView:[UIApplication sharedApplication].keyWindow];

我尝试过showInView:self.view,self.Window,self.view.superview但没有...

我想知道是什么给出了这个错误,并且不会让我以同样的方式这样做...提前感谢!

Answer 1

操作表将转换为iPad上的弹出窗口.有两种显示弹出窗口的方法

 - (void)presentPopoverFromRect:(CGRect)rect inView:(UIView *)view
 permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections
 animated:(BOOL)animated;

 - (void)presentPopoverFromBarButtonItem:(UIBarButtonItem *)item
 permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections
 animated:(BOOL)animated;

从这里猜测,我认为您可以尝试使用以下方法之一来呈现行动表 -

- (void)showFromBarButtonItem:(UIBarButtonItem *)item animated:(BOOL)animated 
- (void)showFromRect:(CGRect)rect inView:(UIView *)view animated:(BOOL)animated

而不是使用showInView:.