我刚开始学习Swift,不太明白如何初始化一个类。
Succeeded在类定义中被初始化为false
。
if (succeeded && (time>1000)){
errormessage += ";connection slow"
}
时间被初始化为
time = data[3].toInt()
数据在哪里
var data = split(raw_data) {$0 == ","}
而 raw_data
是一个字符串。
类定义:
class geocodeObject: NSObject {
init
的定义:
init(lat: String,long:String,userstate:String) {
(没有超级初始化)
完整代码,已削减部分内容:
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 = "¬Store=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) {$0 == ","}
//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!){$0 == " "}
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")
}
}