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我使用AFNetworking 框架https://github.com/AFNetworking/AFNetworking .
一切正常，但函数返回 Null，但一切正常 NSLog 返回 Null。
可能是什么原因？
-(NSString *)cook
{
__block NSString *fecho =nil;
NSURL *baseURL = [NSURL URLWithString:@"http://google.com"];
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:baseURL];
[httpClient defaultValueForHeader:@"Accept"];
NSMutableURLRequest *request = [httpClient requestWithMethod:@"GET" path:@"" parameters:nil];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[httpClient registerHTTPOperationClass:[AFHTTPRequestOperation class]];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)
{
fecho = [[operation.response allHeaderFields] valueForKeyPath:@"Date"];
NSLog(@"%@",fecho);
}
failure:^(AFHTTPRequestOperation *operation, NSError *error)
{
fecho = @"errr";
}];
[request setTimeoutInterval:20.0];
[operation start];
return fecho;
}
非常感谢!
最佳答案
改变 -(NSString *)cook 为
- (void)cookOnCompletion:(void (^)(NSString *errorMessage))completion {
NSURL *baseURL = [NSURL URLWithString:@"http://google.com"];
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:baseURL];
[httpClient defaultValueForHeader:@"Accept"];
NSMutableURLRequest *request = [httpClient requestWithMethod:@"GET" path:@"" parameters:nil];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[httpClient registerHTTPOperationClass:[AFHTTPRequestOperation class]];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)
{
NSString *fecho = [[operation.response allHeaderFields] valueForKeyPath:@"Date"];
completion(fecho);
}
failure:^(AFHTTPRequestOperation *operation, NSError *error)
{
NSString *error = @"errr";
completion(error);
}];
[request setTimeoutInterval:20.0];
[operation start];
}
然后像这样调用cookOnCompletion:
[self cookOnCompletion:^(NSString *response){
NSLog(@"%@",response);
}];
关于ios - AFNetworking 返回函数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22087908/