AFNetworking 2.0，使用NSURLSession下载图像
我试图使用AFNetworking 2.0和NSURLSession从安全服务器下载图像。 但是，如果我尝试像这样下载，则会得到无法转换为图像的字节流：
- (SLRequestExecutionBlock) _getExecutionBlockSession
{
__block SLBaseRequest *blockSelf = self;
SLRequestExecutionBlock executionBlock = ^{
AFHTTPSessionManager *imageDownloadManager = [AFHTTPSessionManager manager];
[imageDownloadManager setResponseSerializer:[AFImageResponseSerializer serializer]];
[imageDownloadManager setRequestSerializer:[AFJSONRequestSerializer serializer]];
[imageDownloadManager.requestSerializer setValue:@"Accept" forHTTPHeaderField:@"application/json"];
if ([SLLoginManager sharedManager].accessToken) {
[imageDownloadManager.requestSerializer setValue:[SLLoginManager sharedManager].accessToken forHTTPHeaderField:@"access_token"];
}
imageDownloadManager.securityPolicy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeCertificate];
imageDownloadManager.securityPolicy.allowInvalidCertificates = YES;
NSDictionary *params = nil;
[[SLHttpNetworkManager sharedManager] GET:_imageURL
parameters:params
success:blockSelf.standardSuccessBlock
failure:blockSelf.standardErrorBlock];
};
return executionBlock;
}
值得一提的是，如果我尝试使用它，它会很好地工作：
- (SLRequestExecutionBlock) _getExecutionBlock
{
__block SLBaseRequest *blockSelf = self;
SLRequestExecutionBlock executionBlock = ^{
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.securityPolicy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeCertificate];
manager.securityPolicy.allowInvalidCertificates = YES;
manager.responseSerializer = [AFImageResponseSerializer serializer];
manager.requestSerializer = [AFJSONRequestSerializer serializer];
if ([SLLoginManager sharedManager].accessToken) {
[manager.requestSerializer setValue:[SLLoginManager sharedManager].accessToken forHTTPHeaderField:@"access_token"];
}
[manager GET:_imageURL
parameters:nil
success:^(AFHTTPRequestOperation *operation, id responseObject) {
blockSelf.returnAttributes = responseObject;
if (blockSelf.completionBlock) {
blockSelf.completionBlock(blockSelf.returnAttributes,nil);
}
[[SLNetworkQueueManager sharedManager] requestDidSucceed:blockSelf];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
//check error code for network errors
NSError* err = error;
[blockSelf failOrTryRefreshTokenForError:err];
}];
};
return executionBlock;
}
是什么赋予了？
问题实际上是来自服务器的图像，即使浏览器可以打开它们。 png标签已损坏
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