问从一个视图传递一个UIPanGestureRecognizer，由另一个视图处理

EN

- (void) viewDidLoad {
...    

    // Add a swipe gesture recognizer to grab page flip swipes that start from the far right of the screen, past the edge of the book page
    self.panGesture = [[[UIPanGestureRecognizer alloc] initWithTarget:self action:nil] autorelease];
    [self.panGesture setDelegate:self];
    [self.iv_background addGestureRecognizer:self.panGesture];

    //enable gesture events on the background image
    [self.iv_background setUserInteractionEnabled:YES];

...
}


#pragma mark - UIGestureRecognizer Delegates
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    // test if our control subview is on-screen
    if (self.pageController.view.superview != nil) {
       if (gestureRecognizer == self.panGesture) {
            // we touched background of the BookViewController, pass the pan to the UIPageViewController
            [self.pageController.view touchesBegan:[NSSet setWithObject:touch] withEvent:UIEventTypeTouches];

            return YES; // handle the touch
        }
    }
    return YES; // handle the touch
}