ios - 由于未捕获的异常 'UIViewControllerHierarchyInconsistency' 终止应用程序，

Question

我在选择器上方创建了一个带有两个按钮的工具栏，并在 ios7 上工作，当我在 ios8 中运行时崩溃:

Terminating app two to uncaught exception 'UIViewControllerHierarchyInconsistency', reason: 'child view controller: Should Have parent view controller: but requested parent is: '

这是一段在 ios7 中安静运行的代码:

 expiredPromoTextField.inputView = DatePicker;
 expiredPromoTextField.delegate = self;
 quantityPromoTextField.inputView = quantityPicker;
 quantityPromoTextField.delegate = self;


 // Create button to close the UIPickerView
 UIToolbar * mypickerToolbar = [[UIToolbar alloc] initWithFrame: CGRectMake (0, 0, 320, 56)];
 mypickerToolbar.barStyle = UIBarStyleBlackTranslucent;
 [mypickerToolbar sizeToFit];
 NSMutableArray * barItems = [[NSMutableArray alloc] init];
 UIBarButtonItem * CancelBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemCancel target: self action:selector (cancelDoneClicked)];
 [barItems addObject: CancelBtn];
 UIBarButtonItem * FLEXspace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemFlexibleSpace target: self action: nil];
 [barItems addObject: FLEXspace];
 UIBarButtonItem * doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemDone target: self action:selector (pickerDoneClicked :)];
 [barItems addObject: doneBtn];
 [mypickerToolbar setItems: barItems animated: YES];
 [quantityPicker setShowsSelectionIndicator: YES];

 expiredPromoTextField.inputAccessoryView = mypickerToolbar;
 quantityPromoTextField.inputAccessoryView = mypickerToolbar;

你知道我意识到 inputAccessoryView 会使应用程序崩溃，我还询问了 Apple 的工程师，他们告诉我这是测试版的问题，但现在 GM 继续给出同样的问题。

我该怎么办？

Answer 1

我在 iOS 8 上有同样的异常，现在修复为以下代码。

重点是，您不应该将输入 View 添加为 View Controller View 的 subview 。(我不知道为什么代码在 iOS 7 中运行良好，但在 iOS 8 中却不再运行良好。)

之前(发生错误)

UITextField* someTF;
View* customView;
UIViewController *mainVC;

[mainVC.view addSubview:customView];
someTF.inputView = customView;

之后(运行良好)

UITextField* someTF;
View* customView;
UIViewController *mainVC;

//  [mainVC.view addSubview:customView];  <-- delete this line
someTF.inputView = customView;