尝试将某些位置固定在 MapView 上时传递给不带参数的调用的参数

Posted 2023-02-24

【中文标题】尝试将某些位置固定在 MapView 上时传递给不带参数的调用的参数

【英文标题】：Argument passed to call that takes no arguments when trying to pin some locations on a MapView

【发布时间】：2021-12-30 19:06:31

【问题描述】：

我收到此错误，但不知道原因。 你能帮帮我吗？

struct Locs: Identifiable 
    let id = UUID()
    let name = String()
    let coord = CLLocationCoordinate2D()
    let alarm = Int()
    let state = Int()
    let radius = Int()
    
    


struct MapView: View 
    
    @State private var region = MKCoordinateRegion(center: CLLocationCoordinate2D(latitude: 5.55613, longitude: 95.3218), span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
    let annotations = [
            Locs(name: "Sultan Hotel", coord: CLLocationCoordinate2D(latitude: 5.55739, longitude: 95.3208), alarm: 0, state: 0, radius: 1),
            Locs(name: "Paparon Pizza Lhokseumawe", coord: CLLocationCoordinate2D(latitude: 5.17837, longitude: 97.1484), alarm: 0, state: 1, radius: 2)
    
    
    ]

【参考方案1】：

您不能在init 之外提供默认值，除非您希望将属性声明为var。

要么：

不要有默认值（除非它不会改变并且不需要成员 init）

struct Locs: Identifiable 
    let id = UUID()
    let name: String
    let coord: CLLocationCoordinate2D
    let alarm: Int
    let state: Int
    let radius: Int

具有自定义init 的默认值

struct Locs: Identifiable 
    let id = UUID()
    let name: String
    let coord: CLLocationCoordinate2D
    let alarm: Int
    let state: Int
    let radius: Int

    init(name: String = "some default name", coord: CLLocationCoordinate2D, alarm: Int, state: Int, radius: Int) 
        self.name = name
        self.coord = coord
        self.alarm = alarm
        self.state = state
        self.radius = radius
    

【讨论】：

谢谢，现在可以使用了