滚动子视图左右，但没有向上或向下

Question

我有一个观点 的子视图我希望用户是阿贝尔滚动这一观点的权利和只剩下。 但向上或向下滚动我想这个观点留在它的地方，我不希望它动的时候。 我该怎么做？

我使用Objective C的适用于iOS的iPhone应用程序编码。

感谢

Answer 1

您可以使用UIScrollView并设置contentSize属性，使其height相同视图的height。

Answer 2

1. 创建panRecognizer

   UIPanGestureRecognizer *panRecognizer; 
   panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self 
                   action:@selector(wasDragged:)]; 
   [[self subview] addGestureRecognizer:panRecognizer]; 
   

2.创建wasDragged方法

- (void)wasDragged:(UIPanGestureRecognizer *)recognizer { 

    CGPoint translation = [recognizer translationInView:self.view]; 
    CGRect recognizerFrame = recognizer.view.frame; 
    recognizerFrame.origin.x += translation.x; 


    // Check if UIImageView is completely inside its superView 
    if (CGRectContainsRect(self.view.bounds, recognizerFrame)) { 
     recognizer.view.frame = recognizerFrame; 
    } 
    // Else check if UIImageView is vertically and/or horizontally outside of its 
    // superView. If yes, then set UImageView's frame accordingly. 
    // This is required so that when user pans rapidly then it provides smooth translation. 
    else { 
     // Check vertically 
     if (recognizerFrame.origin.y < self.view.bounds.origin.y) { 
      recognizerFrame.origin.y = 0; 
     } 
     else if (recognizerFrame.origin.y + recognizerFrame.size.height > self.view.bounds.size.height) { 
      recognizerFrame.origin.y = self.view.bounds.size.height - recognizerFrame.size.height; 
     } 

     // Check horizantally 
     if (recognizerFrame.origin.x < self.view.bounds.origin.x) { 
      recognizerFrame.origin.x = 0; 
     } 
     else if (recognizerFrame.origin.x + recognizerFrame.size.width > self.view.bounds.size.width) { 
      recognizerFrame.origin.x = self.view.bounds.size.width - recognizerFrame.size.width; 
     } 
    } 

    // Reset translation so that on next pan recognition 
    // we get correct translation value 
    [recognizer setTranslation:CGPointZero inView:self.view]; 
}