ios - 如何使用 CGPoint 获取 UIScrollView 的 subview

Question

我有一个 UIScrollView，其中排列着许多大小相等的矩形 subview 。然后我需要能够将 CGPoint 传递给那个 UIScrollView 并且我希望它给我包含 CGPoint 的矩形 subview 。这基本上是 hitTest:event，除了 hitTest:event: 一旦 CGPoint 超出UIScrollView 限制并且不查看其实际内容。

大家都在做什么？如何在 UIScrollView content View 上进行“ HitTest ”？

下面是一些代码来说明这个问题:

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");

输出:第一个矩形OK

Answer 1

您应该能够遍历 ScrollView subview

+(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;
}