用手勢滑動視圖

我正在嘗試開發一個應用程序給Iphone;但我是新的蜜蜂，所以我有很多問題。用手勢滑動視圖

我的應用程序有一個默認視圖和主視圖中名稱爲flashcard的另一個小視圖。

我想增加這個視圖在Iphone中像照片一樣滑動（或滑動）的功能。例如，如果用戶滑動視圖直到內部視圖的中心到達主視圖的邊界，則將有兩種可能性，1 - 如果用戶在到達內部視圖之前完成滑動，則會返回原始位置。 012-2-如果用戶不停止滑動，內部視圖將從滑動方向在屏幕上熄滅，並從相反方向返回屏幕。

所以我宣佈UIPanGestureRecognizer在viewDidLoad中像下面

UIPanGestureRecognizer *panFlashCard = [[UIPanGestureRecognizer alloc] 
             initWithTarget:self action:@selector(handlePanFlashCard:)]; 

[flashcard addGestureRecognizer:panFlashCard]; 
[panFlashCard release];

handPanFlashCard行動：

UIView *piece = [recognizer view]; 
    CGPoint center = piece.center; 
    CGFloat x = 160; // the original x axis of inner view 

    if ([recognizer state] == UIGestureRecognizerStateChanged) { 
     CGPoint translation = [recognizer translationInView:piece ]; 
     [UIView beginAnimations:nil context:NULL]; 
     [UIView setAnimationDuration:0.55]; 
     [piece setCenter:CGPointMake(piece.center.x + translation.x, center.y)]; 
     [UIView commitAnimations]; 
     CGFloat totalX; 
     totalX= x + translation.x; 
     if(translation.x <0) 
     {    
      if (totalX <= 0) 
      { 
       [self showNextCard]; 
      } 
      else 
      { 
       [UIView beginAnimations:nil context:NULL]; 
          [UIView setAnimationDuration:0.55]; 
          [piece setCenter:CGPointMake(self.view.center.x, center.y)]; 
          [UIView commitAnimations]; 
      } 
     } 
     else 
     { 
      if (totalX >= self.view.bounds.size.width) 
      { 
       [self showPreviousCard]; 
      } 
      else 
      { 
       [UIView beginAnimations:nil context:NULL]; 
       [UIView setAnimationDuration:0.55]; 
       [piece setCenter:CGPointMake(self.view.center.x, center.y)]; 
       [UIView commitAnimations]; 
      } 
     } 
    }

showNextCard行動：

[flashcard setCenter:CGPointMake(self.view.bounds.size.width + flashcard.bounds.size.width, flashcard.center.y)]; 

    [UIView beginAnimations:nil context:NULL]; 
    [UIView setAnimationDuration:0.55]; 
    [flashcard setCenter:CGPointMake(self.view.center.x, flashcard.center.y)]; 
    [UIView commitAnimations];

showPreviousCard行動：

[flashcard setCenter:CGPointMake(0 - flashcard.bounds.size.width, flashcard.center.y)]; 

    [UIView beginAnimations:nil context:NULL]; 
    [UIView setAnimationDuration:0.55]; 
    [flashcard setCenter:CGPointMake(self.view.center.x, flashcard.center.y)]; 
    [UIView commitAnimations];

當我運行這個應用程序，它建立並運行成功，但有動畫錯誤，我認爲一些框架錯誤。

請幫我改正這段代碼，並在滑動時運行流暢的動畫。

來源

2011-05-04 bahadir arslan