我知道,这个问题之前问过。但这种情况并不适合我。我正致力于AFNetworking的传输层。我的代码如下。
AFHTTPRequestOperation * post; AFHTTPRequestOperationManager * manager;
AFHTTPRequestOperationManager * manager = [AFHTTPRequestOperationManager manager];
NSMutableDictionary *paramDict = [[NSMutableDictionary alloc] init] ;
delegate = (id<ConnectionUtilDelegate>) delegateObject;
for (Parameter *param in parameterArray)
{
[paramDict setObject:param.value forKey:param.name];
}
NSDictionary *params = paramDict;
manager.responseSerializer = [AFJSONResponseSerializer serializer];
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];
[manager.operationQueue cancelAllOperations];
post = [manager POST:[NSString stringWithFormat:@"%@",url] parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(@"JSON: %@", responseObject);
[delegate requestCompleted:responseObject];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
[delegate requestFailed:error];
NSLog(@"Error: %@", error);
}];
这是我的帖子请求。它的工作就像魅力一样。但有时一些要求可能会迟到。例如,我发送2个不同的帖子请求,名称为P1(Post 1)和P2(Post 2)。如果这些请求响应返回为R1(响应1)而R2(响应2)对我来说是可以的。但是,如果此请求响应作为R2(响应2)而不是R1(响应1)返回,则它是我的应用程序的原因。所以我想在发送新请求时取消旧请求。和
[取消后];
错误: [AFHTTPRequestOperation cancel]:发送到解除分配的实例0x1723cbf0的消息
不适合我。你有什么建议吗?
答案 0 :(得分:1)
正如我在您的代码中看到的那样,您为每个请求创建一个新的AFHTTPRequestOperationManager
实例,然后对新创建的cancelAllOperations
的operationQueue执行AFHTTPRequestOperationManager
。我建议你创建一个类型为AFHTTPRequestOperationManager
的sharedManager,并为你的所有请求使用这个singleton对象:
+ (instancetype)sharedManager {
static AFHTTPRequestOperationManager *instance;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
instance = [AFHTTPRequestOperationManager manager];
});
return instance;
}
然后,您可以在执行新请求之前取消所有请求:
+ (void)cancelAllRequests {
[[AFHTTPRequestOperationManager sharedManager].operationQueue cancelAllOperations];
}
当您调用上述方法时,所有请求都将失败,并且将调用failure
块。因此,您需要检查故障块中的操作是否为cancelled
。最后的代码来了:
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager sharedManager];
NSMutableDictionary *paramDict = [[NSMutableDictionary alloc] init] ;
delegate = (id<ConnectionUtilDelegate>) delegateObject;
for (Parameter *param in parameterArray)
{
[paramDict setObject:param.value forKey:param.name];
}
NSDictionary *params = paramDict;
manager.responseSerializer = [AFJSONResponseSerializer serializer];
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];
AFHTTPRequestOperation *post = [manager POST:[NSString stringWithFormat:@"%@",url] parameters:params
success:^(AFHTTPRequestOperation *operation, id responseObject) {
[delegate requestCompleted:responseObject];
}
failure:^(AFHTTPRequestOperation *operation, NSError *error) {
if (!operation.cancelled) {
[delegate requestFailed:error];
}
}];
[post start];