如何实现iOS 11的MKUserTrackingButton

问题描述

我正在尝试实现MKUserTrackingButton(iOS 11 SDK中的新增功能).这个按钮"实际上是从UIView继承的，所以我只是将一个UIView实例放在我的Map和Identity Inspector中，将其链接到MKUserTrackingButton类，在我的代码和viewDidLoad()中添加了一个插座.

I'm trying to implement a MKUserTrackingButton (which is new in iOS 11 SDK). This "button" actually inherits from UIView so I just put a UIView instance on my Map and in the Identity Inspector, linked it to the MKUserTrackingButton class, added an outlet in my code and in viewDidLoad().

我通过以下方式对其进行初始化:

I initialize it the following way:

self.centerMapButton = MKUserTrackingButton.init(mapView: self.mapView)

但是，什么都没用，我的地图上只有空白视图.

However, nothing works, I just have a blank view on my Map.

PS:这是有关此新功能的WWDC 2017会议(在1:25): https://developer.apple.com/videos/play/wwdc2017/237/

PS: Here's the WWDC 2017 session about this new feature (at 1:25): https://developer.apple.com/videos/play/wwdc2017/237/

这是我在viewDidLoad()中调用以实现按钮的方法:

Here's the method I call in viewDidLoad() to implement the button:

func setupUserTrackingButtonAndScaleView() {
    mapView.showsUserLocation = true

    let button = MKUserTrackingButton(mapView: mapView)
    button.layer.backgroundColor = UIColor(white: 1, alpha: 0.8).cgColor
    button.layer.borderColor = UIColor.white.cgColor
    button.layer.borderWidth = 1
    button.layer.cornerRadius = 5
    button.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(button)

    let scale = MKScaleView(mapView: mapView)
    scale.legendAlignment = .trailing
    scale.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(scale)

    NSLayoutConstraint.activate([button.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -10),
                                 button.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -10),
                                 scale.trailingAnchor.constraint(equalTo: button.leadingAnchor, constant: -10),
                                 scale.centerYAnchor.constraint(equalTo: button.centerYAnchor)])
}

请注意，我的ViewController中当然有一个mapView实例.

Note that I have a mapView instance in my ViewController, of course.

推荐答案

我刚刚针对我的MapKit应用运行了您的代码，它运行良好.确保将正确的mapView实例传递给MKUserTrackingButton.

I just ran your code against my MapKit app and it worked fine. Make sure you are passing the proper mapView instance to the MKUserTrackingButton.

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