ios - UIPanGestureRecognizer 从不调用操作方法

Question

我正在尝试将 UIPanGestureRecognizer 添加到我的 mapView 但我不明白为什么从未调用操作方法(Swift 2.1 )。

import UIKit
import MapKit

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate, UIGestureRecognizerDelegate
{
    override func viewDidLoad()
    { 
        super.viewDidLoad()

        // other stuff...

        let gestureRecognizer = UIPanGestureRecognizer(target: self, action: "didDragMap:")
        gestureRecognizer.delegate = self
        self.mapView.addGestureRecognizer(gestureRecognizer)
    }

    func didDragMap(sender: UIPanGestureRecognizer)
    {
        // never enter here
    }
}

这里出了什么问题？我有相同的 Objective-C 对应并且它可以工作。

Answer 1

由于 MKMapView 已经处理它自己的手势，因此您需要启用它来监听您的手势。

实现shouldRecognizeSimultaneouslyWithGestureRecognizer并像这样返回 true:

func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return true
}

Source