Swift2 如何调用包含完成处理程序的函数?
由于我的大多数应用程序都使用异步的RESTAPI调用,因此仍在尝试获取完成处理程序的挂起状态。我的项目使用Swift2 如何调用包含完成处理程序的函数?,swift2,alamofire,swifty-json,Swift2,Alamofire,Swifty Json,由于我的大多数应用程序都使用异步的RESTAPI调用,因此仍在尝试获取完成处理程序的挂起状态。我的项目使用Alamofire和SwiftyJSON我有一个类函数,它接受我想要用来调用POSTapi并将值插入数据库的参数。API返回插入的新行的ID。我希望以函数返回的快速JSON对象的形式获取响应。以下是函数: class func insertItem(item: String, description: String, quantityOnHand: Int, reorderPoint: In
Alamofire
和SwiftyJSON
我有一个类函数,它接受我想要用来调用POST
api并将值插入数据库的参数。API返回插入的新行的ID。我希望以函数返回的快速JSON
对象的形式获取响应。以下是函数:
class func insertItem(item: String, description: String, quantityOnHand: Int, reorderPoint: Int, supplier_id:Int, completionHandler: JSON -> Void) {
let urlEndpoint = Constants.Urls.Inventory.Add
let newItem = ["item": item, "description": description, "quantityOnHand": quantityOnHand, "reorderPoint": reorderPoint, "supplier_id": supplier_id]
Alamofire.request(.POST, urlEndpoint, parameters: (newItem as! [String : AnyObject]), encoding: .JSON)
.responseJSON { response in
guard response.result.error == nil else {
//got an error, need to handle it
print(response.result.error!)
return
}
completionHandler(JSON(response.response!))
}
}
我正在尝试调用此函数,但我不确定要为完成参数设置什么:
Inventory.insertItem("NewFromFunc", description: "new function!!!", quantityOnHand: 400, reorderPoint: 1, supplier_id: 2, completionHandler: ???)
}
编辑:按现在的状态更新函数。完成后无法返回任何内容:
func insertItem(item: String, description: String, quantityOnHand: Int, reorderPoint: Int, supplier_id:Int, completionHandler: (JSON) -> Void) {
let urlEndpoint = "http://url"
let newItem = ["item": item, "description": description, "quantityOnHand": quantityOnHand, "reorderPoint": reorderPoint, "supplier_id": supplier_id]
Alamofire.request(.POST, urlEndpoint, parameters: ((newItem) as! [String : AnyObject]))
.responseJSON { response in
//print(newItem)
guard response.result.error == nil else {
//got an error, need to handle it
print("Error thread")
return
}
if let value: AnyObject = response.result.value {
//hande results as JSON without bunch of nested if loops
let statusCode = response.response?.statusCode
if statusCode == 201 {
//let newid = value["id"]
//let status = value["status"]
print("Status is 201")
print(value)
}
else {
print("there's an issue returning data")
}
}
completionHandler(JSON(response.response!))
}
}
您需要设置完成处理程序的类型。您的apears应该有一个JSON类型的参数
completionHandler: (JSON) -> Void
completionHandler: ((JSON) -> Void)?
要使它成为可选的,您可以这样做
completionHandler: (JSON) -> Void
completionHandler: ((JSON) -> Void)?
然后你会这样打电话
Inventory.insertItem("NewFromFunc", description: "new function!!!", quantityOnHand: 400, reorderPoint: 1, supplier_id: 2){ data in
//Do something with the data object
}
如果要有多个具有相同类型处理程序的方法,也可以通过创建typeAlias来实现
下面是一个示例,说明如何使用typealias在rest客户机类中使用它,因为响应用于多个方法
typealias ServiceResponse = (JSON, NSError?) -> Void
class RESTClient : NSObject {
static let sharedInstance = RESTClient()
func makeRequest(type: String, endPoint: String, parameters: [String: AnyObject]?, onCompletion: ServiceResponse){
makeRequest(type, endPoint: endPoint, parameters: parameters, files: nil, onCompletion: onCompletion)
}
...
您需要设置完成处理程序的类型。您的apears应该有一个JSON类型的参数
completionHandler: (JSON) -> Void
completionHandler: ((JSON) -> Void)?
要使它成为可选的,您可以这样做
completionHandler: (JSON) -> Void
completionHandler: ((JSON) -> Void)?
然后你会这样打电话
Inventory.insertItem("NewFromFunc", description: "new function!!!", quantityOnHand: 400, reorderPoint: 1, supplier_id: 2){ data in
//Do something with the data object
}
如果要有多个具有相同类型处理程序的方法,也可以通过创建typeAlias来实现
下面是一个示例,说明如何使用typealias在rest客户机类中使用它,因为响应用于多个方法
typealias ServiceResponse = (JSON, NSError?) -> Void
class RESTClient : NSObject {
static let sharedInstance = RESTClient()
func makeRequest(type: String, endPoint: String, parameters: [String: AnyObject]?, onCompletion: ServiceResponse){
makeRequest(type, endPoint: endPoint, parameters: parameters, files: nil, onCompletion: onCompletion)
}
...
您可以创建一个新类 导入UIKit typealias ServiceResponse=(NSDictionary!,NSError!)->Void 类afninject:NSObject{
func getDataWith(parameters:NSDictionary, url:String, onCompletion: ServiceResponse) -> Void {
let manager:AFHTTPRequestOperationManager = AFHTTPRequestOperationManager()
let serializer:AFJSONRequestSerializer = AFJSONRequestSerializer()
manager.responseSerializer.acceptableContentTypes = NSSet(objects:"text/html") as NSSet as Set<NSObject>
manager.requestSerializer = serializer
manager.POST(url, parameters: parameters, success: { (operation: AFHTTPRequestOperation!, responsobject: AnyObject?) -> Void in
let data = responsobject as! NSDictionary?
onCompletion(data,nil)
}) { (operation: AFHTTPRequestOperation!, error: NSError!) -> Void in
let errorObject = error as NSError?
onCompletion(nil,errorObject)
}
}
您可以创建一个新类 导入UIKit typealias ServiceResponse=(NSDictionary!,NSError!)->Void 类afninject:NSObject{
func getDataWith(parameters:NSDictionary, url:String, onCompletion: ServiceResponse) -> Void {
let manager:AFHTTPRequestOperationManager = AFHTTPRequestOperationManager()
let serializer:AFJSONRequestSerializer = AFJSONRequestSerializer()
manager.responseSerializer.acceptableContentTypes = NSSet(objects:"text/html") as NSSet as Set<NSObject>
manager.requestSerializer = serializer
manager.POST(url, parameters: parameters, success: { (operation: AFHTTPRequestOperation!, responsobject: AnyObject?) -> Void in
let data = responsobject as! NSDictionary?
onCompletion(data,nil)
}) { (operation: AFHTTPRequestOperation!, error: NSError!) -> Void in
let errorObject = error as NSError?
onCompletion(nil,errorObject)
}
}
但是当我调用函数时,如何获取该函数返回的JSON?它是否存储在
data
变量中?我已经尝试使用data[“id”]获取它
但什么都不起作用。函数应该返回JSON数据。添加完成处理程序导致我将其更改为返回void。我如何返回数据?谢谢!根据值的类型,您应该能够执行类似data[“id”].string。这将返回一个可为null的字符串。如果您确定它不为null,则可以使用stringValue将其展开。各种类型(int、number、bool等)都有这些方法,但调用函数时如何获取函数返回的JSON?它是否存储在data
变量中?我已尝试使用data[“id”获取它]
但什么都不起作用。函数应该返回JSON数据。添加完成处理程序导致我将其更改为返回void。我如何返回数据?谢谢!根据值的类型,您应该能够执行类似data[“id”].string。这将返回一个可为null的字符串。如果您确定该字符串不为null,则可以使用stringValue将其展开。对于各种类型(int、number、bool等),有以下方法