UIScrollview限制滑动区域

Question

我试图限制UIScrollview的滑动区域,但我无法做到这一点.

我想将滑动区域设置为UIScrollview的顶部,但我想将所有内容设置为可见.

更新:

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    if ([touches count] > 0) {
        UITouch *tempTouch = [touches anyObject];
        CGPoint touchLocation = [tempTouch locationInView:self.categoryScrollView];
        if (touchLocation.y > 280.0)
        {
            NSLog(@"enabled");
            self.categoryScrollView.scrollEnabled = YES;
        }
    }
    [self.categoryScrollView touchesBegan:touches withEvent:event];
}

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
//    [super touchesEnded:touches withEvent:event];
    self.categoryScrollView.scrollEnabled = YES;
    [self.categoryScrollView touchesBegan:touches withEvent:event];
}

解决方案:别忘了在UIScrollView上将delaysContentTouches设置为NO

self.categoryScrollView.delaysContentTouches = NO;

Answer 1

您可以在视图控制器中禁用滚动UIScrollView,覆盖touchesBegan:withEvent:,检查是否在您要启用滑动的区域中开始任何触摸,如果答案为"是",则重新启用滚动.同时覆盖touchesEnded:withEvent:并touchesCancelled:withEvent:在触摸结束时禁用滚动.

Answer 2

其他答案对我不起作用.子类UIScrollView为我工作(Swift 3):

class ScrollViewWithLimitedPan : UIScrollView {
    // MARK: - UIPanGestureRecognizer Delegate Method Override -
    override func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        let locationInView = gestureRecognizer.location(in: self)
        print("where are we \(locationInView.y)")
        return locationInView.y > 400
    }
}