-[MyDictationController respondsToSelector:]消息已发送到释放的实例

Question

我的应用程序崩溃，堆栈跟踪：

[DictationDetailsController respondsToSelector:]: message sent to deallocated instance

我在仪器上跟踪了它，试图看到导致崩溃的相关代码：

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下面是didSelectRowAtIndexPath：MyDictationController方法中委派的相关代码：

- (void)tableView:(UITableView )tableView didSelectRowAtIndexPath:(NSIndexPath )indexPath {
        DictationDetailsController *controller = GET_CONTROLLER_WITH_CLASS([DictationDetailsController class]);
        controller.dictation = [unSubmittedDictations objectAtIndex:indexPath.row];
        controller.isEditMode = YES;
        controller.selectedDate = _selectedDate;
        controller.hidesBottomBarWhenPushed = YES;
        [self.navigationController pushViewController:controller animated:YES];
}

@property (copy ,nonatomic) Dictation *dictation;

此外，我还使用了@synthesize。帮助我解决这个问题，以获得哪个已释放的方法正在被调用。

下面是我的DictationDetailsController接口：

@interface DictationDetailsController : BaseController

@property (copy ,nonatomic) Dictation *dictation;
@property (nonatomic) BOOL isEditMode;
@property (nonatomic) NSDate *selectedDate;

@property (weak, nonatomic) IBOutlet UILabel *navigationTitleLabel;
@property (weak, nonatomic) IBOutlet UITextField *patientNameTextField;
@property (weak, nonatomic) IBOutlet UITextField *accountIDTextField;
@property (weak, nonatomic) IBOutlet UITextField *workTypeTextField;
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *deleteButtonWidth;
@property (weak, nonatomic) IBOutlet UIView *tutorialView;
@property (weak, nonatomic) IBOutlet UIView *audioContainer;
@property (weak, nonatomic) IBOutlet UISlider *audioSlider;
@property (weak, nonatomic) IBOutlet UILabel *durationLabel;
@property (weak, nonatomic) IBOutlet UILabel *noRecordingLabel;
@property (weak, nonatomic) IBOutlet UIButton *playPauseButton;

@end

在dealloc方法中：

- (void)dealloc {
    [player pause];
    player = nil;
    self.dictation = nil;
}

Answer 1

我猜问题出在GET_CONTROLLER_WITH_CLASS方法内部的某个地方。在该行上弹出一个断点并跳过它。它可能正在生成类的已发布实例。在这种情况下，当该方法试图访问口述属性时，崩溃将发生在调用该方法之后的行上。