iPhone - UIWebView手勢

Question

我有viewcontrollers設置爲跟蹤手勢並提交一個操作，在這種情況下，更改選項卡。對於viewcontrollers的代碼如下：

#define HORIZ_SWIPE_DRAG_MIN 100 
CGPoint mystartTouchPosition; 
BOOL isProcessingListMove; 
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    UITouch *touch = [touches anyObject]; 
    CGPoint newTouchPosition = [touch locationInView:self.view]; 
    if(mystartTouchPosition.x != newTouchPosition.x || mystartTouchPosition.y != newTouchPosition.y) { 
     isProcessingListMove = NO; 
    } 
    mystartTouchPosition = [touch locationInView:self.view]; 
    [super touchesBegan:touches withEvent:event]; 
} 

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    UITouch *touch = touches.anyObject; 
    CGPoint currentTouchPosition = [touch locationInView:self.view]; 

    // If the swipe tracks correctly. 
    double diffx = mystartTouchPosition.x - currentTouchPosition.x + 0.1; // adding 0.1 to avoid division by zero 
    double diffy = mystartTouchPosition.y - currentTouchPosition.y + 0.1; // adding 0.1 to avoid division by zero 

    if(abs(diffx/diffy) > 2.5 && abs(diffx) > HORIZ_SWIPE_DRAG_MIN) 
    { 
     // It appears to be a swipe. 
     if(isProcessingListMove) { 
      // ignore move, we're currently processing the swipe 
      return; 
     } 

     if (mystartTouchPosition.x < currentTouchPosition.x) { 
      isProcessingListMove = YES; 
      self.tabBarController.selectedViewController = [self.tabBarController.viewControllers objectAtIndex:0]; 
      return; 
     } 
     else { 
      isProcessingListMove = YES; 

      self.tabBarController.selectedViewController = [self.tabBarController.viewControllers objectAtIndex:2]; 

      return; 
     } 
    } 
    else if(abs(diffy/diffx) > 1) 
    { 
     isProcessingListMove = YES; 
     [super touchesMoved:touches withEvent:event]; 
    } 
} 

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    isProcessingListMove = NO; 
    [super touchesEnded:touches withEvent:event]; 
} 

我想有同樣的姿勢做我已在視圖控制器的視圖下設立一個UIWebView同樣的事情。總之，uiwebview是在視圖上。當我刷卡時，我只是獲得基本的uiwebview功能（滾動）。如果我使用與uiviewcontroller相同的代碼設置自定義uiwebview類，則會出現錯誤。我需要知道如何翻譯該代碼塊，保持功能不變，以適應uiwebview。

Answer 1

你應該能夠繼承UIWebView並覆蓋這些方法。您可能需要重寫所有的觸控方法，不過，

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event; 
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event; 
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event; 
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event 

編輯： 啊，我現在看到你的錯誤。他們是因爲他們沒有像父（你已經知道...）這些事情並不適用於一個UIWebView

由於UIWebView的是一個UIView，你應該能夠取代

[touch locationInView:self.view] 

與

[touch locationInView:self] 

要得到父母的標籤欄控制器，不過，你必須設計不同的方式來做到這一點。你可以傳遞給家長一個參考你的UIWebView子類和揭露父的方法改變其標籤被激活，例如：

在你的子類，添加屬性父標籤欄控制器：

UITabBarController *parent; 

當創建您的UIWebView子類，並將其添加到標籤欄控制器，還設置父：

webView.parent = self; 

如果你在Interface Builder中設置此功能，使家長一個IBOutlet，並把它掛通過IB。

在標籤欄控制器視圖中，添加一個更改所選控制器的方法。你可以使用命名常量，視圖你想切換到，或者確切地描述方法，你要切換到，但爲了簡單起見，你會做概念上類似這樣的：

- (void) switchToView: (int)viewNumber 
{ 
    self.tabBarController.selectedViewController = [self.tabBarController.viewControllers objectAtIndex:viewNumber]; 
} 

然後調用[parent switchToView:2]你碼。

另一種可以說是更好的方法是使用NSNotification s，將父級註冊爲偵聽器。

Answer 2

我完整的代碼如下：

#import "CustomWebView.h" 

@implementation CustomWebView 

//Swipe between tabs 
#define HORIZ_SWIPE_DRAG_MIN 100 
CGPoint mystartTouchPosition; 
BOOL isProcessingListMove; 
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    UITouch *touch = [touches anyObject]; 
    CGPoint newTouchPosition = [touch locationInView:self.view]; "error: request for member 'view' in something not a structure or union" 


    if(mystartTouchPosition.x != newTouchPosition.x || mystartTouchPosition.y != newTouchPosition.y) { 
     isProcessingListMove = NO; 
    } 
    mystartTouchPosition = [touch locationInView:self.view]; "error: request for member 'view' in something not a structure or union" 
    [super touchesBegan:touches withEvent:event]; 
} 

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    UITouch *touch = touches.anyObject; 
    CGPoint currentTouchPosition = [touch locationInView:self.view]; "error: request for member 'view' in something not a structure or union" 

    // If the swipe tracks correctly. 
    double diffx = mystartTouchPosition.x - currentTouchPosition.x + 0.1; // adding 0.1 to avoid division by zero 
    double diffy = mystartTouchPosition.y - currentTouchPosition.y + 0.1; // adding 0.1 to avoid division by zero 

    if(abs(diffx/diffy) > 2.5 && abs(diffx) > HORIZ_SWIPE_DRAG_MIN) 
    { 
     // It appears to be a swipe. 
     if(isProcessingListMove) { 
      // ignore move, we're currently processing the swipe 
      return; 
     } 

     if (mystartTouchPosition.x < currentTouchPosition.x) { 
      isProcessingListMove = YES; 
      self.tabBarController.selectedViewController = [self.tabBarController.viewControllers objectAtIndex:0]; "error: request for member 'tabBarController' in something not a structure or union" 
      return; 
     } 
     else { 
      isProcessingListMove = YES; 

      self.tabBarController.selectedViewController = [self.tabBarController.viewControllers objectAtIndex:2]; "error: request for member 'tabBarController' in something not a structure or union" 

      return; 
     } 
    } 
    else if(abs(diffy/diffx) > 1) 
    { 
     isProcessingListMove = YES; 
     [super touchesMoved:touches withEvent:event]; 
    } 
} 

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    isProcessingListMove = NO; 
    [super touchesEnded:touches withEvent:event]; 
} 
// End of swipe 

@end 

的錯誤是如下所包含的代碼。

我很感激幫助。