我一直在使用UIPickerview作为UITextfield的输入，它完全适用于iOS 7，但是一旦我在iOS 8上运行它，只要我选择文本字段输入数据就会崩溃应用程序;我不知道为什么。
这是代码。
这是我的头文件
@interface myViewController:UIViewController
<UITextFieldDelegate,UIPickerViewDelegate,UIPickerViewDataSource>
@property (weak, nonatomic) IBOutlet UIPickerView *pickerView;
@property (weak, nonatomic) IBOutlet UITextField *myTxtfield;
@end
这是我的.m文件
@implementation myViewController
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *filePath = [[NSBundle mainBundle]
pathForResource:@"myData" ofType:@"plist"];
data = [[NSMutableArray alloc] initWithContentsOfFile:filePath];
self.pickerView.showsSelectionIndicator = YES;
}
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 1;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component{
return [data count];
}
-(NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row forComponent:(NSInteger)component{
return [data objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)pickerView
didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
currentTextField.text = [data objectAtIndex:row];
}
-(BOOL) textFieldShouldReturn:(UITextField *)textField{
[_myTxtfield resignFirstResponder];
return YES;
}
-(void)textFieldDidBeginEditing:(UITextField *)textField {
if (_myTxtfield.isEditing==YES)
{
textField.inputView = _pickerView;
currentTextField = textField;
}
[[textField valueForKey:@"textInputTraits"]
setValue:[UIColor lightGrayColor] forKey:@"insertionPointColor"];
}
-(void)textFieldDidEndEditing:(UITextField *)textField {
[_pickerView selectRow:0 inComponent:0 animated:NO];
}
@end
这是崩溃消息
*** Terminating app due to uncaught exception 'UIViewControllerHierarchyInconsistency', reason: 'child view controller:<UICompatibilityInputViewController: 0x7fa7fd412c40> should have parent view controller:<myViewController: 0x7fa7fb8b7600> but requested parent is:<UIInputWindowController: 0x7fa7fd87d600>'
*** First throw call stack:
(
0 CoreFoundation 0x0000000105521f35 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x00000001051babb7 objc_exception_throw + 45
2 CoreFoundation 0x0000000105521e6d +[NSException raise:format:] + 205
3 UIKit 0x000000010394889f -[UIViewController _addChildViewController:performHierarchyCheck:notifyWillMove:] + 184
4 UIKit 0x0000000103ef5308 -[UIInputWindowController changeToInputViewSet:] + 491
5 UIKit 0x0000000103ef5ebd __43-[UIInputWindowController setInputViewSet:]_block_invoke + 85
6 UIKit 0x00000001038915ce +[UIView(Animation) performWithoutAnimation:] + 65
7 UIKit 0x0000000103ef5c8e -[UIInputWindowController setInputViewSet:] + 291
8 UIKit 0x0000000103ef1a7a -[UIInputWindowController performOperations:withAnimationStyle:] + 50
9 UIKit 0x0000000103ce1bce -[UIPeripheralHost(UIKitInternal) setInputViews:animationStyle:] + 1054
10 UIKit 0x000000010399731d -[UIResponder becomeFirstResponder] + 468
11 UIKit 0x000000010388ce03 -[UIView(Hierarchy) becomeFirstResponder] + 99
12 UIKit 0x0000000103f53ad7 -[UITextField becomeFirstResponder] + 51
13 UIKit 0x0000000103bdb9c1 -[UITextInteractionAssistant(UITextInteractionAssistant_Internal) setFirstResponderIfNecessary] + 177
14 UIKit 0x0000000103bdda30 -[UITextInteractionAssistant(UITextInteractionAssistant_Internal) oneFingerTap:] + 2263
15 UIKit 0x0000000103bd32e6 _UIGestureRecognizerSendActions + 262
16 UIKit 0x0000000103bd1f89 -[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 532
17 UIKit 0x0000000103bd6ba6 ___UIGestureRecognizerUpdate_block_invoke662 + 51
18 UIKit 0x0000000103bd6aa2 _UIGestureRecognizerRemoveObjectsFromArrayAndApplyBlocks + 254
19 UIKit 0x0000000103bccb1d _UIGestureRecognizerUpdate + 2796
20 UIKit 0x0000000103866ff6 -[UIWindow _sendGesturesForEvent:] + 1041
21 UIKit 0x0000000103867c23 -[UIWindow sendEvent:] + 667
22 UIKit 0x00000001038349b1 -[UIApplication sendEvent:] + 246
23 UIKit 0x0000000103841a7d _UIApplicationHandleEventFromQueueEvent + 17370
24 UIKit 0x000000010381d103 _UIApplicationHandleEventQueue + 1961
25 CoreFoundation 0x0000000105457551 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
26 CoreFoundation 0x000000010544d41d __CFRunLoopDoSources0 + 269
27 CoreFoundation 0x000000010544ca54 __CFRunLoopRun + 868
28 CoreFoundation 0x000000010544c486 CFRunLoopRunSpecific + 470
29 GraphicsServices 0x00000001082cc9f0 GSEventRunModal + 161
30 UIKit 0x0000000103820420 UIApplicationMain + 1282
31 أحسب نسبتك 0x0000000102a7afbd أحسب نسبتك + 8125
32 libdyld.dylib 0x0000000105f11145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
答案 0 :(得分：0)
我使用这个新代码解决了这个错误
//in .h file
//CHANGED WEAK PROPERTY TO RETAIN
@property (retain, nonatomic) IBOutlet UIPickerView *pickerView;
//in .m file
//ADDED THESE LINES IN VIEWDIDLOAD
_pickerView = [[UIPickerView alloc]init];
_pickerView.delegate = self;
_pickerView.dataSource = self;