当我使用故事板时，applicationWillResignActive的功能无法识别

Question

我不知道为什么。但是当我使用xib时，没有任何问题。

错误信息是这样的：

2014-04-17 16:59:11.413 State Lab[2227:60b] Cannot find executable for CFBundle 0x8d800c0 </Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk/System/Library/AccessibilityBundles/CertUIFramework.axbundle> (not loaded) 

2014-04-17 16:59:11.453 State Lab[2227:60b] application:didFinishLaunchingWithOptions: 

2014-04-17 16:59:11.459 State Lab[2227:60b] applicationDidBecomeActive: 

2014-04-17 16:59:11.461 State Lab[2227:60b] -[spsViewController applicationDidBecomeActive:]: unrecognized selector sent to instance 0x8f8f390 
2014-04-17 16:59:11.463 State Lab[2227:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[spsViewController applicationDidBecomeActive:]: unrecognized selector sent to instance 0x8f8f390' 

*第一掷调用堆栈：

我的代码：

#import "spsViewController.h" 

    @interface spsViewController() 

    @property (assign, nonatomic) BOOL animate; 

    - (void)rotateLabelUp; 
    - (void)rotateLabelDown; 

    @end 

    @implementation spsViewController 

    @synthesize label, animate; 

    - (void)viewDidLoad 
    { 
     [super viewDidLoad]; 
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillResignActive:) name:UIApplicationWillResignActiveNotification object:[UIApplication sharedApplication]]; 
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidBecomeActive:) name:UIApplicationDidBecomeActiveNotification object:[UIApplication sharedApplication]]; 
     CGRect bounds = self.view.bounds; 
     CGRect labelFrame = CGRectMake(bounds.origin.x, CGRectGetMidY(bounds) - 50, bounds.size.width, 100); 
     self.label = [[UILabel alloc] initWithFrame:labelFrame]; 
     label.font = [UIFont fontWithName:@"Helvetica" size:70]; 
     label.text = @"Bazinga!"; 
     label.textAlignment = NSTextAlignmentCenter; 
     label.backgroundColor = [UIColor clearColor]; 
     [self.view addSubview:label]; 
     [self rotateLabelDown]; 
    } 

    - (void)didReceiveMemoryWarning 
    { 
     [super didReceiveMemoryWarning]; 
     self.label = nil; 
    } 

    - (void)rotateLabelDown 
    { 
     [UIView animateWithDuration:5 
         animations:^{ 
          label.transform = CGAffineTransformMakeRotation(M_PI); 
         } 
         completion:^(BOOL finished){ 
          [self rotateLabelUp]; 
         }]; 
    } 

    - (void)rotateLabelUp 
    { 
     [UIView animateWithDuration:5 
         animations:^{ 
          label.transform = CGAffineTransformMakeRotation(0); 
         } 
         completion:^(BOOL finished){ 
          if (animate) 
           [self rotateLabelDown]; 
         }]; 
    } 

    - (void)applicationWillResignActive 
    { 
     NSLog(@"VC: %@", NSStringFromSelector(_cmd)); 
     animate = NO; 
    } 

    - (void)applicationDidBecomeActive 
    { 
     NSLog(@"VC: %@", NSStringFromSelector(_cmd)); 
     animate = YES; 
     [self rotateLabelDown]; 
    } 

    @end 

Answer 1

更改你的，@selector（applicationDidBecomeActive：）至@selector（applicationDidBecomeActive）

因为你的方法签名为- (void)applicationDidBecomeActive