Question

我试图制作一款使用GPS的应用程序，以下是我的GPS控制器类。如果我尝试将其声明为public，则我的纬度和经度元组会给出编译器警告。

class CoreLocationController : NSObject, CLLocationManagerDelegate {
var locationManager:CLLocationManager = CLLocationManager()
public let ltuple: (latitude:Double, longitude:Double)?;
let location: CLLocation?
override init() {
    super.init()
    self.locationManager.delegate = self
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
    self.locationManager.requestAlwaysAuthorization()
    self.locationManager.startUpdatingLocation()
}

func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
    println("didChangeAuthorizationStatus")
    switch status {

    case .NotDetermined:
        println(".NotDetermined")
        self.locationManager.requestAlwaysAuthorization() //Will use information provided in info.plist
        break

    case .Authorized:
        println(".Authorized")
        self.locationManager.startUpdatingLocation()
        break
    ...

    };
}
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
    //Important things
    let location = locations.last as CLLocation;
    let ltuple = (location.coordinate.latitude, location.coordinate.longitude)
    let geocoder = CLGeocoder()
    //Printing
    let str = "didUpdateLocations:  "+String(format:"%f", location.coordinate.latitude)+String(format:"%f", location.coordinate.longitude);
    println(str)
    println(ltuple)
    }
func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
    println(error)
}
};

当我试图摆脱第二个let时，它会给我＆＃34;无法将ltuple分配给self＆＃34;。任何想法？

Answer 1

您的课程天生就有internal class声明，您只需撰写class SomeClass但代码真的是internal class SomeClass。

如果您希望班级中有public个属性/函数/等，则必须先将班级声明为public。

public class SomeClass

public let someImmutableProperty

您可以在Apple的文档中阅读有关访问控制的所有信息：The Swift Programming Language: Access Control

我个人更喜欢这篇文章，它非常简洁并简化了Access Control的概念。

此外，您不应在Swift代码中使用;，请参阅此Swift Style Guide以供参考。

“宣布公开让内部阶级” - 斯威夫特

1 个答案: