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我正在将我的应用程序更新到 iOS 8 并尝试按照此处所述重新创建UIPickerView内部 a 。使用 Nada Gamal 的答案，我能够重新创建功能，但唯一的响应是在选项卡栏中（即使选项卡栏隐藏在选择器视图后面）。标签栏控制器是根视图控制器。UIActionSheetUIAlertControllerUIPickerView

-(void)loadPickerView{
    UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0, 44.0, 0.0, 0.0)];
    pickerView.showsSelectionIndicator = YES;
    pickerView.dataSource = self;
    pickerView.delegate = self;
    pickerView.backgroundColor = [UIColor whiteColor];
    [pickerView selectRow:pickerViewRow inComponent:0 animated:NO];

    UIToolbar *pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 44)];
    pickerToolbar.tintColor = self.navigationController.navigationBar.tintColor;

    NSMutableArray *barItems = [[NSMutableArray alloc] init];

    UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
    [barItems addObject:flexSpace];

    UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dismissActionSheet)];
    [barItems addObject:doneBtn];

    [pickerToolbar setItems:barItems animated:YES];

    UIAlertController * searchActionSheet=[UIAlertController alertControllerWithTitle:@"" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];

    [ searchActionSheet.view setBounds:CGRectMake(8, 208, self.view.frame.size.width, pickerView.frame.size.height+pickerToolbar.frame.size.height)];

    [searchActionSheet.view addSubview:pickerToolbar];
    [searchActionSheet.view addSubview:pickerView];
    [self presentViewController:searchActionSheet animated:YES completion:nil];
}

最后presentViewController一行中的似乎是问题所在。我尝试了许多不同的方法来让 pickerView 在标签栏区域之外做出响应，包括：

  • self
  • self.tabBarController
  • self.navigationController（pickerView 根本不显示）
  • [[UIApplication sharedApplication] keyWindow].rootViewController

另一种选择是为此制作一个单独的视图控制器，但我担心这也不起作用，因为UIAlertController它是 的子类UIViewController，但也许这是将子视图添加到UIAlertController.

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