如何防止UINavigationBar阻止视图上的触摸

Question

我有一个UIView被部分卡下方的UINavigationBar上UIViewController这是在全屏模式下.的UINavigationBar块这个视图,它的覆盖它的部分的触摸.我希望能够解锁这些视图并让它们通过.我已经使用以下内容将UINavigationBar子类化:

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
    UIView *view = [super hitTest:point withEvent:event];

    if (view.tag == 399)
    {
        return view;
    }
    else
    {
        return nil;
    }
}

...我用数字399标记了有问题的视图.是否有可能通过这个视图的触摸而没有指向它的指针(就像我在上面标记它一样)？对于如何使用hittest方法(或者甚至可能)进行此操作,我有点困惑.

Answer 1

这是一个不需要设置您想要在下面启用的特定视图的版本。相反，它允许任何触摸通过，除非该触摸发生在 aUIControl或带有UIGestureRecognizer.

import UIKit

/// Passes through all touch events to views behind it, except when the
/// touch occurs in a contained UIControl or view with a gesture
/// recognizer attached
final class PassThroughNavigationBar: UINavigationBar {

    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        guard nestedInteractiveViews(in: self, contain: point) else { return false }
        return super.point(inside: point, with: event)
    }

    private func nestedInteractiveViews(in view: UIView, contain point: CGPoint) -> Bool {

        if view.isPotentiallyInteractive, view.bounds.contains(convert(point, to: view)) {
            return true
        }

        for subview in view.subviews {
            if nestedInteractiveViews(in: subview, contain: point) {
                return true
            }
        }

        return false
    }
}

fileprivate extension UIView {
    var isPotentiallyInteractive: Bool {
        guard isUserInteractionEnabled else { return false }
        return (isControl || doesContainGestureRecognizer)
    }

    var isControl: Bool {
        return self is UIControl
    }

    var doesContainGestureRecognizer: Bool {
        return !(gestureRecognizers?.isEmpty ?? true)
    }
}

Answer 2

我修改了 Tricky 的解决方案，将 SwiftUI 作为Extension. 非常适合解决这个问题。将此代码添加到代码库后，所有视图都将能够捕获屏幕顶部的点击。

还将此更改发布到我的博客。

import UIKit

/// Passes through all touch events to views behind it, except when the
/// touch occurs in a contained UIControl or view with a gesture
/// recognizer attached
extension UINavigationBar {
    open override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        guard nestedInteractiveViews(in: self, contain: point) else { return false }
        return super.point(inside: point, with: event)
    }

    private func nestedInteractiveViews(in view: UIView, contain point: CGPoint) -> Bool {
        if view.isPotentiallyInteractive, view.bounds.contains(convert(point, to: view)) {
            return true
        }

        for subview in view.subviews {
            if nestedInteractiveViews(in: subview, contain: point) {
                return true
            }
        }

        return false
    }
}

private extension UIView {
    var isPotentiallyInteractive: Bool {
        guard isUserInteractionEnabled else { return false }
        return (isControl || doesContainGestureRecognizer)
    }

    var isControl: Bool {
        return self is UIControl
    }

    var doesContainGestureRecognizer: Bool {
        return !(gestureRecognizers?.isEmpty ?? true)
    }
}

Answer 3

子类UINavigationBar并覆盖- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event,以便NO为要接收的视图触摸的rect 返回,否则返回YES.

例如:

UINavigationBar子类.h:

@property (nonatomic, strong) NSMutableArray *viewsToIgnoreTouchesFor; 

UINavigationBar子类.m:

- (NSMutableArray *)viewsToIgnoreTouchesFor
{
    if (!_viewsToIgnoreTouchesFor) {
        _viewsToIgnoreTouchesFor = [@[] mutableCopy];
    }
    return _viewsToIgnoreTouchesFor;
}

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
    BOOL pointInSide = [super pointInside:point withEvent:event];
    for (UIView *view in self.viewsToIgnoreTouchesFor) {

        CGPoint convertedPoint = [view convertPoint:point fromView:self];
        if ([view pointInside:convertedPoint withEvent:event]) {
            pointInSide = NO;
            break;
        }
    }

    return pointInSide;
}

在您的全屏viewController中,您可以在navBar后面添加这些行 viewDidLoad

UINavigationBarSubclass *navBar = 
(UINavigationBarSubclass*)self.navigationController.navigationBar;
[navBar.viewsToIgnoreTouchesFor addObject:self.buttonBehindBar];

请注意:这不会向navigationBar发送触摸,这意味着如果您添加一个位于导航栏按钮后面的视图,导航栏上的按钮将不会接收到触摸.

迅速:

var viewsToIgnore = [UIView]()

override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {

    let ignore = viewsToIgnore.first {
        let converted = $0.convert(point, from: self)
        return $0.point(inside: converted, with: event)
    }
    return ignore == nil && super.point(inside: point, with: event)
}

有关详细信息,请参阅文档pointInside:withEvent:

此外,如果pointInside:withEvent:不能按您的意愿工作,则可能值得尝试上面的代码hitTest:withEvent:.