error-handling - NSURLConnection没有调用didFailWithError。

Question

我试图编写一些代码来检查数据源的URL，然后使用该URL中的对象填充数组。它实际上运行良好，但是如果Web连接或地址有问题，我想用 bundle 文件中的数据填充数组。我遇到的问题是从未调用connection didFailWithError方法。我尝试传递一个简单的字符串，但未调用。我希望该应用程序仍能对使用ipod touch或处于飞行模式的人起作用。
connection didReceiveResponse运行正常。

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)连接:(NSURLConnection *)连接didReceiveResponse:(NSURLResponse *)响应{
listConnectFail =否；
NSLog(@“连接成功，从API填充”)；
}

我知道我可能没有看到这很愚蠢，但是我可以使用帮助来查看我没有看到的东西

提前致谢!

Answer 1

您如何确认您的代表未收到该消息？您检查日志了吗？

您的代码似乎假设NSURLConnection的init完成后会立即设置“listConnectFail”，而事实并非一定如此。

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

NSURLConnection文档指出，“代理将在加载过程中接收代理消息”。

但是，我不确定飞行模式，也许可以同步检测到此特定错误。