打印到标签的距离

Question

现在我正在打印控制台内两个位置之间的距离，但如何在标签内打印它？

现在我正在尝试使用 self.distanceLabel.text = distance 但是使用此代码我得到以下错误行：无法分配类型的值'Double' 键入 'String?'

完整代码：

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    if let lastLocation = locations.last {

        let myLocation = CLLocation(latitude: lastLocation.coordinate.latitude, longitude: lastLocation.coordinate.longitude)

        let myBuddysLocation = CLLocation(latitude: 59.326354, longitude: 18.072310)

        let distance = myLocation.distance(from: myBuddysLocation) / 1000
        print(String(format: "The distance to the Job is %.01fkm", distance))
        self.distanceLabel.text = distance
    }
}

Answer 1

您需要分配 distance 类型的格式化字符串 double

self.distanceLabel.text =  String(format: "The distance to the Job is %.01fkm", distance)

如果不需要描述，也可以像这样

self.distanceLabel.text = "\(distance)"

打印到标签的距离

printing distance to label

cllocationmanager

ios

swift