ASIHTTPRequest-multiple request

Question

我正在開發一個應用程序，它會向Facebook服務器請求某些用戶的個人資料圖片URL，但我不知道我將擁有多少用戶（可能是2或可能是20）。我是否應該使用帶有循環和同步請求的ASIHTTPRequest，或帶有循環的API圖（帶iOS的Facebook SDK）？

Answer 1

嘗試使用ASINetworkQueue。它將允許您創建一個仍然可以異步啓動的ASIHTTPRequests隊列。例如

- (void)getImages 
{ 
    if(!self.queue) 
     self.queue = [[[ASINetworkQueue alloc] init] autorelease]; 

    NSArray* urlStringsToRequest = [NSArray arrayWithObjects:@"http://www.example.com/image1.png",@"http://www.example.com/image2.png",nil]; 
    for(NSString* urlString in urlStringsToRequest) 
    { 
     NSURL *url = [NSURL URLWithString:urlString]; 
     ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; 
     [request setDelegate:self]; 
     [request setDidFinishSelector:@selector(requestDone:)]; 
     [request setDidFailSelector:@selector(requestWentWrong:)]; 
     [self.queue addOperation:request]; 
    } 

    [self.queue go]; 
} 

- (void)requestDone:(ASIHTTPRequest*)req 
{ 
    UIImage* image = [UIImage imageWithData:[req responseData]]; 

    [imageArray addObject:image]; 
} 

- (void)requestWentWrong:(ASIHTTPRequest*)req 
{ 
    NSLog(@"Request returned an error %@",[req error]); 
}