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Alamofire
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ebec5bec
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体验新版 GitCode,发现更多精彩内容 >>
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ebec5bec
编写于
9月 24, 2014
作者:
M
Mattt Thompson
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Adding section about generic response object serialization
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...
...
@@ -569,6 +569,78 @@ enum Router: URLRequestConvertible {
Alamofire
.
request
(
Router
.
ReadUser
(
"mattt"
))
// GET /users/mattt
```
#### Generic Response Object Serialization
Generics can be used to provide automatic, type-safe response object serialization.
```
swift
@objc
public
protocol
ResponseObjectSerializable
{
init
(
response
:
NSHTTPURLResponse
,
representation
:
AnyObject
)
}
extension
Alamofire
.
Request
{
public
func
responseObject
<
T
:
ResponseObjectSerializable
>
(
completionHandler
:
(
NSURLRequest
,
NSHTTPURLResponse
?,
T
?,
NSError
?)
->
Void
)
->
Self
{
let
serializer
:
Serializer
=
{
(
request
,
response
,
data
)
in
let
JSONSerializer
=
Request
.
JSONResponseSerializer
(
options
:
.
AllowFragments
)
let
(
JSON
:
AnyObject
?
,
serializationError
)
=
JSONSerializer
(
request
,
response
,
data
)
if
response
!=
nil
&&
JSON
!=
nil
{
return
(
T
(
response
:
response
!
,
representation
:
JSON
!
),
nil
)
}
else
{
return
(
nil
,
serializationError
)
}
}
return
response
(
serializer
:
serializer
,
completionHandler
:
{
(
request
,
response
,
object
,
error
)
in
completionHandler
(
request
,
response
,
object
as?
T
,
error
)
})
}
}
```
class User: ResponseObjectSerializable {
let username: String
let name: String
required init(response: NSHTTPURLResponse, representation: AnyObject) {
self.username = response.URL!.lastPathComponent
self.name = representation.valueForKeyPath("name") as String
}
}
```
```
Alamofire.request(.GET, "http://example.com/users/mattt")
.responseObject { (_, _, user: User?, _) in
println(user)
}
```
The same approach can also be used to handle endpoints that return a representation of a collection of objects:
```
swift
@objc public protocol ResponseCollectionSerializable {
class func collection(#response: NSHTTPURLResponse, representation: AnyObject) -> [Self]
}
extension Alamofire.Request {
public func responseCollection
<T:
ResponseCollectionSerializable
>
(completionHandler: (NSURLRequest, NSHTTPURLResponse?, [T]?, NSError?) -> Void) -> Self {
let serializer: Serializer = { (request, response, data) in
let JSONSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
let (JSON: AnyObject?, serializationError) = JSONSerializer(request, response, data)
if response != nil && JSON != nil {
return (T.collection(response: response!, representation: JSON!), nil)
} else {
return (nil, serializationError)
}
}
return response(serializer: serializer, completionHandler: { (request, response, object, error) in
completionHandler(request, response, object as? [T], error)
})
}
}
```
* * *
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