ios - 确定 MKMapView 是否在 Swift 2.0 中被拖动/移动

Question

我如何检测用户何时拖动或移动 MKMapView 以便，例如，防止自动归位到用户的当前位置。

Answer 1

注意:这个答案是可能的，并且改编自 Jano 对 Objective-C 相同问题的回答:determine if MKMapView was dragged/moved .谢谢Jano .

要正确检测 map 拖动，您必须添加 UIPanGestureRecognizer。这是拖动手势识别器(平移 = 拖动)。

第 1 步:在 viewDidLoad (Swift 2) 中添加手势识别器

override func viewDidLoad() {
    super.viewDidLoad()
    // All your other setup code
    let mapDragRecognizer = UIPanGestureRecognizer(target: self, action: "didDragMap:")
    mapDragRecognizer.delegate = self
    self.mapView.addGestureRecognizer(mapDragRecognizer)
}

上述手势识别器设置的 Swift 3 版本(选择器语法已更改)

override func viewDidLoad() {
    super.viewDidLoad()
    let mapDragRecognizer = UIPanGestureRecognizer(target: self, action: #selector(self.didDragMap(gestureRecognizer:)))
    mapDragRecognizer.delegate = self
    self.mapView.addGestureRecognizer(mapDragRecognizer)
}

第 2 步:将协议(protocol) UIGestureRecognizerDelegate 添加到 View Controller ，使其作为委托(delegate)工作。

class MapViewController: UIViewController, UIGestureRecognizerDelegate

第 3 步:为 UIPanGestureRecognizer 添加以下代码，以便与 MKMapView 中现有的手势识别器一起工作:

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

第 4 步:如果您想在每次拖动时调用您的方法一次而不是 50 次，请检测选择器中的“拖动结束”或“拖动开始”状态:

func didDragMap(gestureRecognizer: UIGestureRecognizer) {
    if (gestureRecognizer.state == UIGestureRecognizerState.Began) {
        print("Map drag began")
    }

    if (gestureRecognizer.state == UIGestureRecognizerState.Ended) {
        print("Map drag ended")
    }
}

希望这对有需要的人有帮助!