控制UIScrollView外界？

Question

我想知道如何让用户滚动到UIScrollView的边界之外？

Answer 1

您可以尝试将superview的各种UIView方法中的触摸事件转发到scrollview,看看是否可行.例如:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [scrollView touchesBegan:touches withEvent:event];
}
// etc

或者您可以尝试在superview上使用UIPanGestureRecognizer,并在获取pan事件时显式设置滚动视图偏移.例如:

- (void)handlePan:(UIPanGestureRecognizer *)pan
{
    scrollView.contentOffset = [pan translationInView:scrollView];
}
// Or something like that.

Answer 2

尝试子类化UIScrollView和 覆盖，hitTest:withEvent:以便UIScrollView拾取触及其边界之外。像这样的东西：

@interface MagicScrollView : UIScrollView
@end

@implementation MagicScrollView

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    // Intercept touches 100pt outside this view's bounds on all sides
    if (CGRectContainsPoint(CGRectInset(self.bounds, -100, -100), point)) {
        return self;
    }
    return nil;
}

@end

您可能还需要覆盖pointInside:withEvent:的UIScrollView的上海华盈，这取决于你的布局。

有关更多信息，请参阅以下问题：interaction over bounds of uiview