[英]Parse JSON response with AFNetworking
我在Objective-C中使用AFNetworking
設置了一個JSON帖子,並使用以下代碼將數據發送到服務器:
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSDictionary *parameters = @{@"name": deviceName, @"model": modelName, @"pin": pin};
manager.requestSerializer = [AFJSONRequestSerializer serializer];
[manager.requestSerializer setValue:@"Content-Type" forHTTPHeaderField:@"application/json"];
[manager POST:@"SENSORED_OUT_URL" parameters:parameters
success:^(AFHTTPRequestOperation *operation, id responseObject)
{
NSLog(@"JSON: %@", responseObject);
}
failure:^(AFHTTPRequestOperation *operation, NSError *error)
{
NSLog(@"Error: %@", error);
}];
我通過相同的請求收到信息,並希望將數據發送到NSString
。 我如何使用AFNetworking
做到這AFNetworking
?
responseObject
是NSArray或NSDictionary。 您可以使用isKindOfClass:
在運行時檢查::
if ([responseObject isKindOfClass:[NSArray class]]) {
NSArray *responseArray = responseObject;
/* do something with responseArray */
} else if ([responseObject isKindOfClass:[NSDictionary class]]) {
NSDictionary *responseDict = responseObject;
/* do something with responseDict */
}
如果你真的需要JSON的字符串,可以通過查看operation.responseString
獲得它。
在這種情況下,當Web服務使用JSON
響應時, AFNetworking
將為您執行序列化,而responseObject
很可能是NSArray
或NSDictionary
對象。
這樣的對象應該比具有JSON
內容的字符串更有用。
在我的情況下,它看起來像(也許它可以幫助)
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.requestSerializer = [AFJSONRequestSerializer serializer];
[manager POST:url parameters:params
success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSDictionary *jsonDict = (NSDictionary *) responseObject;
//!!! here is answer (parsed from mapped JSON: {"result":"STRING"}) ->
NSString *res = [NSString stringWithFormat:@"%@", [jsonDict objectForKey:@"result"]];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
//....
}
];
也很好檢查響應對象的類型(如https://stackoverflow.com/a/21962445/3628317答案)
我覺得最好將AFHTTPClient子類化為:
// MyHTTPClient.h
#import <AFNetworking/AFHTTPClient.h>
@interface MyHTTPClient : AFHTTPClient
+ (instancetype)sharedClient;
@end
// MyHTTPClient.m
#import "MyHTTPClient.h"
#import <AFNetworking/AFJSONRequestOperation.h>
static NSString *kBaseUrl = @"http://api.blah.com/yada/v1/";
@implementation MyHTTPClient
+ (instancetype)sharedClient {
static id instance;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
instance = [[self alloc] init];
});
return instance;
}
- (id)init {
if (self = [super initWithBaseURL:[NSURL URLWithString:kBaseUrl]]) {
self.parameterEncoding = AFJSONParameterEncoding;
[self setDefaultHeader:@"Accept" value:@"application/json"]; // So AFJSONRequestOperation becomes eligible for requests.
[self registerHTTPOperationClass:[AFJSONRequestOperation class]]; // So that it gets used for postPath etc.
}
return self;
}
@end
重要的是:
然后你可以像這樣使用它:
#import "MyHTTPClient.h"
@implementation UserService
+ (void)createUserWithEmail:(NSString *)email completion:(CreateUserCompletion)completion {
NSDictionary *params = @{@"email": email};
[[MyHTTPClient sharedClient] postPath:@"user" parameters:params success:^(AFHTTPRequestOperation *operation, NSDictionary *responseObject) {
completion([responseObject[@"userId"] intValue], YES);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
completion(0, NO);
}];
}
@end
這樣做的好處在於,您的responseObject會自動被JSON解析為字典(或數組)。 很干凈。
(這是針對afnetworking 1.x)
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