向右和向左滚动子视图，但不能向上或向下滚动答案

【问题标题】：scroll a subview right and left but not up or down向右和向左滚动子视图，但不能向上或向下滚动
【发布时间】：2016-04-21 00:02:17
【问题描述】：

我有一个视图的子视图我希望用户能够仅左右滚动此视图。但是当向上或向下滚动时，我希望这个视图保持在我不希望它移动的位置。我该怎么做？

我正在使用 iOS iphone 应用程序的 Objective c 进行编码。

谢谢

【问题讨论】：

标签： ios objective-c uiscrollview subview

【解决方案1】：

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

【讨论】：

你不明白我的意思，我想要一个可以滚动但只能左右滚动的小 ui 视图。如果用户向上向下滚动我想留在顶部栏下，我不希望它从它的位置移动

【解决方案2】：

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];
}

【讨论】：