ios - NSInvalidArgumentException : unrecognized selector sent to instance

Question

当我运行我的应用程序时，我收到此错误:

    Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-
     [UIRoundedRectButton copyWithZone:]: unrecognized selector sent to instance
     0xcc86970'

为什么我会收到这样的错误？我仔细检查了 IBOutlets 和所有 IBAction 的所有连接。这是我的代码:

菜单 View Controller .h

     @interface MenuViewController : UIViewController
<UITableViewDelegate, UITableViewDataSource>{

}


@property (nonatomic, copy) IBOutlet UITableView * tableView;
@property (nonatomic,copy) IBOutlet UILabel *labelTitle;
@property (nonatomic, copy) IBOutlet UIButton *buttonHome;
@property (nonatomic, copy) IBOutlet UIButton *buttonMap;
@property (nonatomic, copy) IBOutlet UIButton *buttonFavorites;

 -(IBAction) pressedHome:(id)sender;
-(IBAction) pressedMap: (id)sender;
-(IBAction) pressedFavorites: (id)sender;

 @end

在 MenuViewController.m

 -(IBAction) pressedHome:(id)sender{

     MenuViewController * menu =[[MenuViewController alloc]initWithNibName:@"MenuViewController" bundle:nil];
   [self.navigationController pushViewController:menu animated:YES];


    }

  -(IBAction) pressedMap: (id)sender{

       MapViewController * map =[[MapViewController alloc]initWithNibName:@"MapViewController" bundle:nil];
       [self.navigationController pushViewController:map animated:YES];
   }


  -(IBAction) pressedFavorites: (id)sender{

        FavoritesViewController * favorites =[[FavoritesViewController alloc]initWithNibName:@"FavoritesViewController" bundle:nil];
       [self.navigationController pushViewController:favorites animated:YES];
   }

提前致谢

Answer 1

删除 copy .发生这种情况是因为 UIButton(和其他 UIControls)不符合 NSCopying协议(protocol)，因此复制它们的调用失败。