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我正在尝试编写一些代码来检查数据源的 URL，然后用来自该 URL 的对象填充一个数组。它实际上运行良好，但如果 Web 连接或地址出现问题，我想用捆绑文件中的数据填充数组。我遇到的问题是该connection didFailWithError方法永远不会被调用。我尝试传递一个简单的字符串，但它没有调用。我希望该应用程序仍然适用于使用 ipod touch 或处于飞行模式的人。

connection didReceiveResponse工作没有问题。

这就是我正在使用的。

- (void)loadListData{
NSLog(@"Loading data from sources");

NSURLRequest *listURLRequest = [NSURLRequest requestWithURL:integerPhoneListURL cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:1.0];
[[NSURLConnection alloc] initWithRequest:listURLRequest delegate:self];

  if (!listConnectFail){
        phoneListJSON =[NSData dataWithContentsOfURL:integerPhoneListURL];
        [self performSelectorOnMainThread:@selector(fetchedData:) withObject:phoneListJSON waitUntilDone:YES];


    } else {
        //This will tell us if there is an error loading the file
        NSLog(@"File not found on web init from file");
        phoneListJSON =[NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"contactlist" ofType:@"json"]];
        [self performSelectorOnMainThread:@selector(fetchedData:) withObject:phoneListJSON waitUntilDone:YES];
    }



//Initialize the filtered list with array of customer objects. Based on original data
filteredList = [[NSMutableArray alloc] init];

for (NSDictionary *dict in phoneListOriginal) {
    contact *single = [[contact alloc] init];
    single.fName = [dict objectForKey:@"fName"];
    single.lName = [dict objectForKey:@"lName"];
    single.extension = [dict objectForKey:@"extension"];
    single.title = [dict objectForKey:@"title"];
    single.department = [dict objectForKey:@"department"];
    single.cellNumber = [dict objectForKey:@"cellNumber"];
    //NSLog(@"%@", single.lName);
    [filteredList addObject:single];
}


NSLog(@"Array filteredLIst contains %d records",[filteredList count]); }

-（无效）连接：（NSURLConnection *）连接didFailWithError：（NSError *）错误{

listConnectFail = YES; 
NSLog(@"Connection Failed, pulling from file"); }

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { listConnectFail = NO; NSLog(@"连接成功，从 API 填充"); }

我知道这可能是我没有看到的愚蠢的东西，但我可以使用帮助来查看我没有看到的东西

提前致谢！

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1 回答 1

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您如何确认您的代表没有收到消息？你检查过日志吗？

您的代码似乎假定 NSURLConnection 的初始化完成后将立即设置“listConnectFail”，但情况并非如此。

[[NSURLConnection alloc] initWithRequest:listURLRequest delegate:self];
if (!listConnectFail){...}

NSURLConnection 文档指出“随着负载的进行，委托将接收委托消息。”

但是，我不确定飞行模式，也许可以同步检测到这个特定的错误。

于 2012-04-10T20:03:56.853 回答