如何在AFNetworking 2.0中設置請求超時和緩存策略？

Question

我正在按照給定的示例代碼

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
[manager GET:@"http://example.com/resources.json" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"JSON: %@", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@", error);
}];

要更改超時和緩存策略，我'已經黑了'庫並創建了

- (AFHTTPRequestOperation *)GET:(NSString *)URLString
                     parameters:(NSDictionary *)parameters
                          timeoutInterval:(NSTimeInterval)timeoutInterval
                    cachePolicy:(NSURLRequestCachePolicy)cachePolicy
                        success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
                        failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
{
    NSMutableURLRequest *request = [self.requestSerializer requestWithMethod:@"GET" URLString:[[NSURL URLWithString:URLString relativeToURL:self.baseURL] absoluteString] parameters:parameters];
    [request setTimeoutInterval:timeoutInterval];
    [request setCachePolicy:cachePolicy];
    AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithRequest:request success:success failure:failure];
    [self.operationQueue addOperation:operation];

    return operation;
}

這樣做有干凈的方法嗎？

Answer 1

我有點懶於分類或子類。 您可以直接訪問經理的請求序列化程序：

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.requestSerializer.timeoutInterval = INTERNET_TIMEOUT;
manager.requestSerializer.cachePolicy = NSURLRequestReloadIgnoringLocalAndRemoteCacheData;

Answer 2

最好的是創建一個子類

（您也可以采用相同的方式添加緩存策略）

TimeoutAFHTTPRequestSerializer.h

#import "AFURLRequestSerialization.h"

@interface TimeoutAFHTTPRequestSerializer : AFHTTPRequestSerializer

@property (nonatomic, assign) NSTimeInterval timeout;

- (id)initWithTimeout:(NSTimeInterval)timeout;

@end

TimeoutAFHTTPRequestSerializer.m

#import "TimeoutAFHTTPRequestSerializer.h"

@implementation TimeoutAFHTTPRequestSerializer

- (id)initWithTimeout:(NSTimeInterval)timeout {

    self = [super init];
    if (self) {
        self.timeout = timeout;
    }
    return self;

}

- (NSMutableURLRequest *)requestWithMethod:(NSString *)method
                                 URLString:(NSString *)URLString
                                parameters:(NSDictionary *)parameters
                                     error:(NSError *__autoreleasing *)error
{
    NSMutableURLRequest *request = [super requestWithMethod:method URLString:URLString parameters:parameters error:error];

    if (self.timeout > 0) {
        [request setTimeoutInterval:self.timeout];
    }
    return request;
}

@end

采用

self.requestOperationManager.requestSerializer = [[TimeoutAFHTTPRequestSerializer alloc] initWithTimeout:30];

Answer 3

您還可以創建類別AFHTTPRequestOperationManager + timeout來添加此方法，而無需子類化AFHTTPRequestOperationManager。

Answer 4

請查看方法1以獲得更簡潔的方法 ： https ： //stackoverflow.com/a/21238330/435040

不同之處在於我正在使用子類化而且我沒有修補AFNetworking的代碼。

我忘了提一件事。 在那個答案中，我只是改變了超時間隔，但添加一些其他緩存策略只是另外一行代碼。

Answer 5

嘗試類似的東西：

NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:kRequestTimout];

其中kRequestTimout是您想要的超時持續時間

然后構建您的序列化請求：

NSURLRequest *serializedRequest = [self.requestOperationManager.requestSerializer requestBySerializingRequest:request withParameters:parameters error:&error];

並創建並添加您的請求操作：

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:serializedRequest];
[operation setCompletionBlockWithSuccess:successBlock failure:failureBlock];
[self.requestOperationManager.operationQueue addOperation:operation];