Question

我正在尝试向UIPanGestureRecognizer添加mapView，但我不知道为什么动作方法永远不会被调用（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
    }
}

这里有什么问题？我有相同的Objective-C对应，它的工作。

Answer 1

由于MKMapView已经处理了它自己的手势，你需要让它也能听你的手势。

实施shouldRecognizeSimultaneouslyWithGestureRecognizer并返回true，如下所示：

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

Source

UIPanGestureRecognizer从不调用action方法

1 个答案: