我使用的是 Swift 4,我有一个用默认值初始化的结构。 我在里面创建了一个函数,它应该读取 JSON 并根据它获取的内容更改这些默认值,但它似乎不起作用。
错误:闭包不能隐式捕获一个变异的 self 参数
代码:
struct Workspace: Decodable {
var guid: String
var name: String
private enum CodingKeys : String, CodingKey {
case guid = "guid"
case name = "name"
}
init(){
self.guid = "blbl"
self.name = "oops"
}
mutating func getUserWorkspace(base: String, completed: @escaping () -> ()){
let url = URL(string: "some url")!
var request = URLRequest(url: url)
request.addValue("Basic \(base)", forHTTPHeaderField: "Authorization")
request.addValue("application/json", forHTTPHeaderField: "Accept")
URLSession.shared.dataTask(with: request){ (data, response, error) in
if error == nil {
do {
let res: Workspace = try JSONDecoder().decode(Workspace.self, from: data!)
self.guid = res.guid //Error here
self.name = res.name //Error here
DispatchQueue.main.async {
completed()
}
}catch {
print ("JSON error")
}
}
}.resume()
}
我把let改成var了,但是我想还是有不明白的地方..
最佳答案
//Try this one and let me know
struct Workspace: Decodable {
static var shared = Workspace()
var guid: String
var name: String
private enum CodingKeys : String, CodingKey {
case guid = "guid"
case name = "name"
}
init(){
self.guid = "blbl"
self.name = "oops"
}
mutating func getUserWorkspace(base: String, completed: @escaping () -> ()){
let url = URL(string: "some url")!
var request = URLRequest(url: url)
request.addValue("Basic \(base)", forHTTPHeaderField: "Authorization")
request.addValue("application/json", forHTTPHeaderField: "Accept")
URLSession.shared.dataTask(with: request){ (data, response, error) in
if error == nil {
do {
let res: Workspace = try JSONDecoder().decode(Workspace.self, from: data!)
Workspace.shared.guid = res.guid //Error here
Workspace.shared.name = res.name //Error here
DispatchQueue.main.async {
completed()
}
}catch {
print ("JSON error")
}
}
}.resume()
}
}
关于swift - 结构内部的变异函数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50297188/