手勢識別器在下一個級別崩潰

Question

我試圖實現手勢識別器，一切都運行良好，直到它加載下一個級別，然後在下一個級別階段，在哪裏可以點擊去下一個級別，如果我使用手勢，程序崩潰。

需要說明的是，一個關卡完成後，標題會顯示「下一關 - 觸摸進入下一關」。在我添加手勢識別器之前，點擊會導致水平遞增，並使用[super initWithSize：size]根據關卡號碼顯示與新變量相同的場景。當我添加手勢識別器時，當屏幕上出現「下一級 - 觸摸以進入下一級」時，點擊仍然會將我帶到下一級，但平底鍋會使應用程序崩潰。

我的手勢識別器在下面。

- (void)didMoveToView:(SKView*)view { 

    UIGestureRecognizer *spinner = [[UIPanGestureRecognizer alloc] initWithTarget:self  action:@selector(handlePanGesture:)]; 
    [self.view addGestureRecognizer:spinner]; 

} 



- (void)handlePanGesture:(UIPanGestureRecognizer *)gestureRecognizer { 

    CGPoint velocity = [gestureRecognizer velocityInView:self.view]; 

    if (velocity.y > 0) { 

      NSLog(@"gesture went down"); 

    } else { 

      NSLog(@"gesture went up"); 

    } 
} 

的問題可能是在路上，我遞增水平或使這裏實現觸摸是觸摸開始方法和水平增量代碼

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { 

    BOMPlayerNode *playerNode = (BOMPlayerNode*)[self childNodeWithName:@"Player"]; 

    if (!self.restart) { 

     for (UITouch *touch in touches) { 
    CGPoint positionInScene = [touch locationInNode:self]; 

    int duration = 1.0; 

    SKAction * actionMove = [SKAction moveTo:CGPointMake(positionInScene.x, positionInScene.y) duration:duration]; 
    [playerNode runAction:actionMove]; 

     } 
    } else if (self.restart && self.nextLevel) { 
     levelCount++; 
     for (SKNode *node in [self children]) { 
      [node removeFromParent]; 
     } 


     BOMGamePlayScene *scene = [BOMGamePlayScene sceneWithSize:self.view.bounds.size]; 
     [self.view presentScene:scene]; 

    } else if (self.restart && self.tryAgain) { 
     for (SKNode *node in [self children]) { 
      [node removeFromParent]; 
     } 


     BOMGamePlayScene *scene = [BOMGamePlayScene sceneWithSize:self.view.bounds.size]; 
     [self.view presentScene:scene]; 
    } 

} 

- (void) update:(NSTimeInterval)currentTime { 

    if (GameOverConditions) { 

     self.tryAgain = YES; 
     self.restart = YES; 
     [self performGameOver]; 

    } else if (NextLevelConditions) { 

     self.restart = YES; 
     self.nextLevel = YES; 
     [self performNextLevel]; 

    } 

} 


- (void) performGameOver { 
    if (!self.gameOverDisplayed) { 
     BOMGameOverNode *gameOver = [BOMGameOverNode gameOverAtPosition:CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))]; 
     self.gameOverDisplayed = YES; 
    } 

} 

- (void) performNextLevel { 
    if (!self.nextLevelDisplayed) { 
     BOMNextLevelNode *nextLevel = [BOMNextLevelNode  nextLevelAtPosition:CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))]; 
     self.nextLevelDisplayed = YES; 
    } 

} 

任何幫助將非常感激。

Answer 1

當您轉換到新場景時，手勢識別器不會自動從SKView中刪除。您需要手動刪除它們。您的平移手勢識別器已配置爲撥打[self handlePanGesture];。但是，當您轉換到新場景時，發佈了self。當您嘗試在新場景中平移時，會調用舊的釋放識別器處理程序，導致崩潰。爲了解決這個問題，您需要從視圖中移除識別器。這裏有一個如何做一個例子：

// Add this to your SKScene subclass. It will automatically be called when you 
// transition to a new scene. 
- (void) willMoveFromView:(SKView *)view { 
    // Remove all gesture recognizers from the view 
    for (UIGestureRecognizer *gesture in view.gestureRecognizers) { 
     [view removeGestureRecognizer:gesture]; 
    } 
}