'self' 在 super.init 调用之前使用

Question

我是 swift 的新手，我不明白如何初始化 class。

成功在class定义中初始化为false

if (succeeded && (time>1000)){
   errormessage += ";connection slow"
 }

时间初始化为

time = data[3].toInt()

数据在哪里

var data = split(raw_data) {[=14=] == ","}

而raw_data是一个字符串。

Class定义：

class geocodeObject: NSObject {

init定义：

init(lat: String,long:String,userstate:String) {

（没有任何类型的超级初始化）

完整代码与切入方式：

class geocodeObject: NSObject {
    //A type to store the data from the Reverse Geocoding API
    //Not a retriever
    
    //Options
    let API_KEY_TEXAS = "9e4797c018164fdcb9a95edf3b10ccfc"
    let DEV_MODE = true
    //Loading status
    var succeeded = false
    var errormessage = "Not Initalized" //Not nesscarilly a failure, could be slow connection
    var loadstate: String?
    //Most important info
    var street: String?; var housenumber: String?; var city: String?; var zip: String?
    //Metadata
    var time: IntegerLiteralType?; var statuscode: String?; var queryid: String?; var zip4: String?
    //Other geographical data
    var entirestreet: String?; var state: String?
    init(lat: String,long:String,userstate:String) {
        //userstate: State provided by user
        //state: State provided by Reverse Geocoder

        var url: String?
        var extra: String?
        if DEV_MODE{
            extra = "&notStore=true"
        }
        else{
            extra = ""
        }
        url = "http://geoservices.tamu.edu/Services/ReverseGeocoding/WebService/v04_01/HTTP/default.aspx?lat="+lat+"&lon="+long+"&apikey="+API_KEY_TEXAS+"&version=4.01"
        if (userstate == "nil"){
            url = url! + extra!
            println("if")
        }
        else{
            url = url! + "&state="+state!+extra!
            println("else")
        }
        
        let raw_data = retrieveurl(url!)
        var data = split(raw_data) {[=17=] == ","}
        //data[1] is API version used.
        statuscode = data[0]; queryid = data[2]; time = data[3].toInt(); entirestreet = data[4]; city = data[5]
        state = data[6]; zip = data[7]; zip4 = data[8]
        //Do street, housenumber, errormessage, succeeded
        if (state != userstate){
            println("user state not equal to state")
        }
        var splittedstreet = split(entirestreet!){[=17=] == " "}
        housenumber = splittedstreet[0]
        street = splittedstreet[1]
        println(statuscode)
        //Error message handling
        switch String(statuscode!){
            case "200":
                errormessage = "Success"
            case "400":
                errormessage = "Unknown API key error"
            case "401":
                ...
        //Time handling
        if (succeeded && (time>1000)){
            errormessage += ";connection slow"
        }
       }
        println("/GeocodingAPIWrapper.swift/.geocodeObject.init: Not Implemented")
    }
    
}

Answer 1

已经有一段时间了，但我找到的答案是您应该将 super.init() 添加为 init 块中的第一行

init(lat: String,long:String,userstate:String) {
    super.init()
    ...

这样我就摆脱了它并满足了错误的要求。据我了解，您的变量是在 NSObject.init() 期间初始化的，因此您可以在自定义 init(_) 块

中使用分配的值

Answer 2

Swift 2.2（撰写本文时仍处于测试阶段）如果您不小心忘记从 guard 中 return nil，当前会显示此错误s else:

required init?(dictionary: [String: AnyObject]) {

    guard let someValue = dictionary["someValue"] as? Bool else { return /*nil*/ } //Nil should not be commented here
    self.someValue = someValue

    super.init(dictionary: dictionary) //`self` used before super.init call
}

希望这对某人有所帮助

'self' 在 super.init 调用之前使用

'self' used before super.init call

class

super

swift