滚动子视图左右，但没有向上或向下

问题描述：

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？滚动子视图左右，但没有向上或向下

我使用Objective C的适用于iOS的iPhone应用程序编码。

感谢

答

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

你不明白我的意思，我想有一个可以滚动的小UI视图但只限于左侧和右侧。如果用户向下滚动，我想保留在顶栏之下，我不希望它从它的位置移动 –

答

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]; 
}

滚动子视图左右，但没有向上或向下

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