我试图显示一个包含 UIPickerView 和 UITextField 的弹出窗口。

以下是我用来创建弹出窗口的代码。

self.alert = [UIAlertController alertControllerWithTitle:nil message:@"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n" preferredStyle:UIAlertControllerStyleAlert];


    CGRect pickerFrame = CGRectMake(0, 0, 270, 200);
    UIPickerView *regionsPicker = [[UIPickerView alloc] initWithFrame:pickerFrame];
    regionsPicker.tag = 1;
    regionsPicker.dataSource = (id <UIPickerViewDataSource>)self;
    regionsPicker.delegate = (id <UIPickerViewDelegate>) self;
    [regionsPicker setShowsSelectionIndicator:YES];

    UIView *toolView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 270.0f, 44.f)];
    toolView.backgroundColor = [UIColor blackColor];

    CGRect buttonFrame = CGRectMake(0, 5, 100, 30);
    UIButton *button = [[UIButton alloc] initWithFrame: buttonFrame];
    button.imageEdgeInsets = UIEdgeInsetsMake(0, button.titleLabel.frame.size.width, 0, -button.titleLabel.frame.size.width);
    UIImage *btnImage = [UIImage imageNamed:@"delete.png"];
    [button setImage:btnImage forState:UIControlStateNormal];
    [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [button setTitleColor: [UIColor blueColor] forState: UIControlStateNormal];
    [toolView addSubview:button];
    [button addTarget:self action:@selector(closeDialog:) forControlEvents:UIControlEventTouchUpInside];


    self.textField = [[UITextView alloc] initWithFrame:CGRectMake(30, 170, 220, 200)];
    _textField.editable = NO;
    _textField.hidden=true;
    self.textField.text = @"Enter text...";
    self.textField.font = [UIFont systemFontOfSize:15];
    self.textField.autocorrectionType = UITextAutocorrectionTypeNo;
    self.textField.keyboardType = UIKeyboardTypeDefault;
    self.textField.returnKeyType = UIReturnKeyDone;
    self.textField.textColor = [UIColor lightGrayColor];
    self.textField.delegate = (id <UITextViewDelegate>) self;
    self.textField.layer.borderWidth = 1.0f;
    self.textField.layer.cornerRadius = 5;
    self.textField.layer.borderColor = [[UIColor grayColor] CGColor];

    [toolView addSubview:self.textField];

    CGRect actionFrame = CGRectMake(80, 400, 100, 30);
    UIButton *actionBtn = [[UIButton alloc] initWithFrame: actionFrame];
    [actionBtn setTitle:@"Submit" forState:UIControlStateNormal];
    [actionBtn setTitleColor: [UIColor whiteColor] forState: UIControlStateNormal];
    [actionBtn setBackgroundColor:[UIColor purpleColor]];

    [self.textField setUserInteractionEnabled:YES];
    [toolView setUserInteractionEnabled:YES];
    [self.alert.view setUserInteractionEnabled:YES];

    [self.alert.view addSubview:regionsPicker];
    [self.alert.view addSubview:self.textField];
    [self.alert.view addSubview:toolView];
    [self.alert.view addSubview:actionBtn];
    id rootViewController=[UIApplication sharedApplication].delegate.window.rootViewController;
    if([rootViewController isKindOfClass:[UINavigationController class]])
    {
        rootViewController=[((UINavigationController *)rootViewController).viewControllers objectAtIndex:0];
    }
    [rootViewController presentViewController:_alert animated:YES completion:nil];

它工作正常。但是，如果我试图通过点击它在 UITextField 中输入文本，键盘不会出现，因此我无法在 UITextField 中键入任何内容。我该如何解决这个问题？

最佳答案

the reason is you added textField, button, all those inside toolview , but the toolview height is very less

将您的 toolView 高度从 44 更改为 进入 500 否则(文本字段、按钮的组合 + 50)。 更改以下语句

UIView *toolView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 270.0f, 44.f)]; 

到

 UIView *toolView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 270.0f, 500.f)];

更新

改变这一行

    [self presentViewController:alert animated:YES completion:nil];

进入

   id rootViewController=[UIApplication sharedApplication].delegate.window.rootViewController;
if([rootViewController isKindOfClass:[UINavigationController class]])
{
  rootViewController=[((UINavigationController *)rootViewController).viewControllers objectAtIndex:0];
}
[rootViewController presentViewController:alert animated:YES completion:nil];

更新新

  UIViewController *rootViewController=[UIApplication sharedApplication].delegate.window.rootViewController;
if([rootViewController isKindOfClass:[UINavigationController class]])
{
  rootViewController=[((UINavigationController *)rootViewController).viewControllers objectAtIndex:0];
}else
{
   while (rootViewController.presentedViewController) {
    rootViewController = rootViewController.presentedViewController;
}
 }
[rootViewController presentViewController:alert animated:YES completion:nil];

swift

 var rootViewController: UIViewController = UIApplication.sharedApplication().delegate.window.rootViewController
if (rootViewController is UINavigationController.self) {
rootViewController = ((rootViewController as! UINavigationController)).viewControllers[0]
}
else {
while rootViewController.presentedViewController {
    rootViewController = rootViewController.presentedViewController
}
}
rootViewController.presentViewController(alert, animated: true, completion: { _ in })

关于ios - UIAlertController 不是窗口层次结构，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37021648/