Question

我有一个UIScrollView，其中包含大量相同大小的矩形子视图。然后我需要能够将CGPoint传递给UIScrollView，我希望它能够为我提供包含CGPoint的矩形子视图。这基本上是hitTest:event，除了hitTest:event: UIScrollView一旦CGPoint超出UIScrollView范围，并且不会调查其中UIScrollView实际内容。

每个人都在做什么？如何进行测试＆＃34;在NSArray *rectangles = [self getBeautifulRectangles]; CGFloat rectangleLength; rectangleLength = 100; // add some rectangle subviews for (int i = 0; i < rectangles.count; i++) { UIView *rectangle = [rectangles objectAtIndex:i]; [rectangle setFrame:CGRectMake(i * rectangleLength, 0, rectangleLength, rectangleLength)]; [_scrollView addSubview:rectangle]; } [_scrollView setContentSize:CGSizeMake(rectangleLength * rectangles.count, rectangleLength)]; // add scroll view to parent view UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0,0,320, rectangleLength)]; [containerView addSubview:_scrollView]; // compute CGPoint to center of first rectangle CGPoint number1RectanglePoint = CGPointMake(0 * rectangleLength + 50, 50); // compute CGPoint to center of fifth rectangle CGPoint number5RectanglePoint = CGPointMake(4 * rectangleLength + 50, 50); UIView *firstSubview = [containerView hitTest:number1RectanglePoint withEvent:nil]; UIView *fifthSubview = [containerView hitTest:number5RectanglePoint withEvent:nil]; if (firstSubview) NSLog(@"first rectangle OK"); if (fifthSubview) NSLog(@"fifth rectangle OK"); 内容视图？

这里有一些代码来说明问题：

{{1}}

输出：第一个矩形确定

Answer 1

如果滚动滚动视图，我猜您将错误的CGPoint坐标传递给hitTest:withEvent:方法导致错误的行为。

传递给此方法的坐标必须位于目标视图坐标系中。我猜您的坐标位于UIScrollView的superview坐标系中。

您可以在使用CGPoint hitPoint = [scrollView convertPoint:yourPoint fromView:scrollView.superview]进行命中测试之前转换坐标。

在您的示例中，您让容器视图执行命中测试，但容器只能看到＆amp;点击滚动视图的可见部分，因此您的点击失败。

要点击滚动视图的可见区域之外的子视图，您必须直接在滚动视图上执行命中测试：

UIView *firstSubview = [_scrollView hitTest:number1RectanglePoint withEvent:nil];
UIView *fifthSubview = [_scrollView hitTest:number5RectanglePoint withEvent:nil];

Answer 2

您应该能够遍历scrollview子视图

+(UIView *)touchedViewIn:(UIScrollView *)scrollView atPoint:(CGPoint)touchPoint {

    CGPoint actualPoint = CGPointMake(touchPoint.x + scrollView.contentOffset.x, scrollView.contentOffset.y + touchPoint.y);

    for (UIView * subView in scrollView.subviews) {
        if(CGRectContainsPoint(subView.frame, actualPoint)) {
            NSLog(@"THIS IS THE ONE");
            return subView;
        }

    }

    //Nothing touched
    return nil;
}

如何使用CGPoint获取UIScrollView的子视图

2 个答案: