Question

我有一个视图的子视图我希望用户能够将此视图仅向右和向左滚动。但是当向上或向下滚动时，我希望这个视图留在它的位置，我不希望它移动。我怎么能这样做？

我使用iOS iphone应用程序的目标c进行编码。

由于

Answer 1

您可以使用UIScrollView并设置contentSize属性，使其height与您的观看次数height相同。

Answer 2

创建panRecognizer

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

2.Create wasDragged method

 - (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];
}

向右和向左滚动子视图但不向上或向下滚动

2 个答案: