SwiftUI中Overlay遮挡按钮，需同时保留捏合/长按手势的方案问询

要同时保留按钮点击和捏合/长按手势功能，核心是让UIKit手势识别器仅处理非按钮区域的触摸事件，不拦截按钮的点击。具体修改如下：

1. 给手势识别器添加代理，过滤按钮区域触摸 #

修改PinchZoomView类，让它遵守UIGestureRecognizerDelegate协议，实现代理方法来判断是否接收触摸事件：

class PinchZoomView: UIView, UIGestureRecognizerDelegate { // 添加协议
    let minScale: CGFloat
    let maxScale: CGFloat
    var isPinching: Bool = false
    var scale: CGFloat = 1.0
    let scaleChange: (CGFloat) -> Void
    let location: (CGPoint) -> Void
    
    private var longPressLocation = CGPoint.zero
    
    init(minScale: CGFloat, maxScale: CGFloat, currentScale: CGFloat, scaleChange: @escaping (CGFloat) -> Void, location: @escaping (CGPoint) -> Void) {
        self.minScale = minScale
        self.maxScale = maxScale
        self.scale = currentScale
        self.scaleChange = scaleChange
        self.location = location
        super.init(frame: .zero)
        
        // 初始化手势并设置代理
        let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(pinch(gesture:)))
        pinchGesture.cancelsTouchesInView = false
        pinchGesture.delegate = self // 设置代理
        
        let longPressGesture = UILongPressGestureRecognizer(target: self, action: #selector(longPress(gesture:)))
        longPressGesture.delegate = self // 设置代理
        
        addGestureRecognizer(pinchGesture)
        addGestureRecognizer(longPressGesture)
    }
    
    required init?(coder: NSCoder) {
        fatalError()
    }
    
    // 代理方法：判断是否接收触摸事件
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        // 捏合手势直接接收（双指操作不会和按钮点击冲突）
        if gestureRecognizer is UIPinchGestureRecognizer {
            return true
        }
        
        // 长按/单指操作：如果触摸到按钮（UIControl），则不接收
        if let touchedView = touch.view, touchedView is UIControl {
            return false
        }
        
        // 通用判断：触摸到其他可交互视图时不接收
        let hitView = hitTest(touch.location(in: self), with: nil)
        if hitView != self && hitView?.isUserInteractionEnabled == true {
            return false
        }
        
        return true
    }
    
    // ... 原有长按和捏合处理方法保持不变
}

2. 移除Overlay的allowsHitTesting(false) #

修改PinchToZoom modifier，去掉allowsHitTesting(false)，让手势识别器正常接收触摸：

struct PinchToZoom: ViewModifier {
    let minScale: CGFloat
    let maxScale: CGFloat
    @Binding var scale: CGFloat
    @State var anchor: UnitPoint = .center
    @State var isPinching: Bool = false
    
    @Binding var longPressLocation: CGPoint
    
    func body(content: Content) -> some View {
        ZStack {
            content
                .scaleEffect(scale, anchor: anchor)
                .animation(.spring(), value: isPinching)
                .overlay(
                    PinchZoom(minScale: minScale, maxScale: maxScale, scale: $scale, isPinching: $isPinching, longPressLocation: $longPressLocation)
                    // 移除这行：.allowsHitTesting(false)
                )
        }
    }
}

原理说明 #

• 捏合手势是双指操作，和按钮的单指点击完全不冲突，所以直接允许接收所有触摸。
• 长按/单指操作通过代理方法判断：如果触摸点落在按钮（SwiftUI Button底层是UIControl）或其他可交互视图上，手势识别器就放弃该触摸事件，让按钮自己处理点击。
• 非按钮区域的长按和捏合手势仍能正常触发，实现地图缩放、平移和添加标记的功能。

内容的提问来源于stack exchange，提问作者DeveloperSammy