Question

AFNetworking 同步请求 有谁教教我

Answer 1

原来使用ASI,同步异步都有,但是,AFNETWORKING没有同步调用,全是异步,封装了个试试.
就是用个NSCondition 搞个等待就OK了.

-(NSDictionary*)reqUtil:(NSString*)reqURLStr
{

NSCondition* itlock = [[NSCondition alloc] init];//搞个事件来同步下

NSLog(@"reqstr:%@",reqURLStr);
__block NSDictionary* itret = nil;

//AFNETWORKING 异步请求
[self getPath:reqURLStr parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
//执行成功之后的BLOCK代码

//得到了数据
JSONDecoder *jd=[[JSONDecoder alloc] init];
NSDictionary* tt = [jd objectWithData:responseObject];
itret = [[NSDictionary alloc] initWithDictionary:tt];

[itlock lock];
[itlock signal];//设置事件,下面那个等待就可以收到事件返回了
[itlock unlock];

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

NSLog(@"neterr:%@",[error localizedDescription]);
[_delegate didFailedUpdateWithError:error];

[itlock lock];
[itlock signal];//失败也要设置事件,不然下面一直死等了
[itlock unlock];

}];

[itlock lock];//启动AFNETWORKING之后就等待事件
[itlock wait];
[itlock unlock];

return itret;

}
注意:该函数千万不能在主线程调用,因为上述的成功,失败 BLOCK代码afnetworking会切换到主线程来执行,但是,主线程已经被 [itlock wait]; 等死了,这样afnetworking 在切换到主线程执行BLOCK的时候也会被等死,就死锁了.