NSURLConnection不调用didFailWithError。

Question

我正在尝试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，但如果网络连接或地址有问题，我想用捆绑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，但它不会调用。我希望应用程序仍可以用于正在使用iPod touch或处于飞行模式的用户。

connection didReceiveResponse正在工作没有问题。

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的*）连接didFailWithError：（NSError *）错误{

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

- （无效）连接：（NSURLConnection的*）连接didReceiveResponse：（NSURLResponse *）响应{listIdctFail = NO; NSLog（@“连接成功，从API填充”）; }

我知道这可能是一些愚蠢的事，我没有看到，但我可以使用帮助，看看有什么我不事先

谢谢！

Answer 1

你是如何确认你的代表没有收到消息的？你检查了日志吗？

您的代码似乎认为'listConnectFail'将在NSURLConnection的init完成后立即设置，但不一定如此。

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

NSURLConnection文档指出'代理将在加载过程中接收委托消息。'

但是，我不确定飞机模式，也许这个特定的错误可以同步检测到。