Swift2 嵌套Alamofire回调或全局使用的返回值
我目前正在尝试嵌套Alamofire请求,以使用我已经使用GET请求成功接收到的数据 对于这段代码,我在这个问题中使用了Rob的答案 但是,我既不能嵌套Alamofire请求,也不能单独使用它们 这就是我想做的Swift2 嵌套Alamofire回调或全局使用的返回值,swift2,ios9,alamofire,swifty-json,Swift2,Ios9,Alamofire,Swifty Json,我目前正在尝试嵌套Alamofire请求,以使用我已经使用GET请求成功接收到的数据 对于这段代码,我在这个问题中使用了Rob的答案 但是,我既不能嵌套Alamofire请求,也不能单独使用它们 这就是我想做的 override func viewDidLoad() { super.viewDidLoad() var currentFoodType: String = "" var currentFoodList: String = "" //debug
override func viewDidLoad() {
super.viewDidLoad()
var currentFoodType: String = ""
var currentFoodList: String = ""
//debug
//this is how I get back the token from NSUserDefault
if let myToken = userDefaults.valueForKey("token"){
// calling method to get the user info
getUserInfo(myToken as! String)
// calling method to get the product type
func getFoodCategory(completionHandler: (NSDictionary?, NSError?) -> ()) {
getProductTypes(myToken as! String, completionHandler: completionHandler)
}
getFoodCategory() { responseObject, error in
// use responseObject and error here
let foodTypesJSON = JSON(responseObject!)
//to get one single food category
currentFoodType = (foodTypesJSON["types"][0].stringValue)
print(currentFoodType)
/////////////////////////////////////////
func getFoodsByCategory(completionHandler: (NSDictionary?, NSError?) -> ()) {
print("getting " + currentFoodType)
self.getProductsByType(myToken as! String, productType: currentFoodType, completionHandler: completionHandler)
}
getFoodsByCategory() { responseObject, error in
// use responseObject and error here
print("responseObject = \(responseObject); error = \(error)")
return
}
return
}
}
然后,我从中调用的另外两个函数是非常直接的Alamofire请求,并回调到上面的CompletionHandler
//GET THE PRODUCT TYPES FROM THE SERVER
func getProductTypes(myToken: String, completionHandler: (NSDictionary?, NSError?) -> ()) {
let requestToken = "Bearer " + myToken
let headers = ["Authorization": requestToken]
let getProductTypesEndpoint: String = BASE_URL + PRODUCT_TYPES
Alamofire.request(.GET, getProductTypesEndpoint, headers: headers)
.responseJSON{ response in
switch response.result {
case .Success(let value):
completionHandler(value as? NSDictionary, nil)
case .Failure(let error):
completionHandler(nil, error)
}
}//END ALAMOFIRE GET responseJSON
}
上面的函数返回一个类似于“甜点”的食物,它将在下面的函数中用于从服务器获取所有甜点
//GET THE PRODUCTS FROM THE SERVER GIVEN A CATEGORY
func getProductsByType(myToken: String, productType: String, completionHandler: (NSDictionary?, NSError?) -> ()){
let requestToken = "Bearer " + myToken
let headers = ["Authorization": requestToken]
let getProductTypesEndpoint: String = BASE_URL + PRODUCT_BY_TYPE + productType
Alamofire.request(.GET, getProductTypesEndpoint, headers: headers)
.responseJSON { response in
switch response.result {
case .Success(let value):
print("no errors")
let auth = JSON(value)
print("The pbt GET description is: " + auth.description)
completionHandler(value as? NSDictionary, nil)
case .Failure(let error):
print("there was an error")
completionHandler(nil, error)
}
}//END ALAMOFIRE GET responseJSON
}
这很好,因为当我在getProductsByType函数中打印时
使用
我得到了所有产品的JSON,但问题在于viewDidload函数中嵌套了回调
getFoodsByCategory() { responseObject, error in
// use responseObject and error here
print("responseObject = \(responseObject); error = \(error)")
return
}
该位中的打印显示出某些错误,因此我无法按照自己的意愿解析我的响应
因为我得到了以下信息
responseObject = nil; error = nil
因此,我的猜测是,必须有一种不同的方法来嵌套这些回调?看看来自的链接承诺。这也适用于Alamofire:
func loadFoo() -> Promise<Bar> {
return Promise<Bar> { fulfill, reject in
Alamofire.request(.GET, "url")
.responseJSON { response in
switch response.result {
case .Success(let value):
let bar = Bar(fromJSON: value)
fulfill(bar)
case .Failure(let error):
reject(error)
}
}
}
}
// Usage
getBar()
.then { bar -> Void in
// do something with bar
}
.error { error in
// show error
}
func loadFoo()->Promise{
返回承诺{履行,拒绝
请求(.GET,“url”)
.responseJSON{中的响应
开关响应。结果{
成功案例(let value):
let bar=bar(fromJSON:value)
完成(巴)
案例。失败(let错误):
拒绝(错误)
}
}
}
}
//用法
getBar()
.然后{bar->Void in
//用酒吧做点什么
}
.error{中的错误
//显示错误
}
这是一个非常简单的示例,但您可以在文档中找到更多相关示例
func loadFoo() -> Promise<Bar> {
return Promise<Bar> { fulfill, reject in
Alamofire.request(.GET, "url")
.responseJSON { response in
switch response.result {
case .Success(let value):
let bar = Bar(fromJSON: value)
fulfill(bar)
case .Failure(let error):
reject(error)
}
}
}
}
// Usage
getBar()
.then { bar -> Void in
// do something with bar
}
.error { error in
// show error
}