NSURLConnection没有调用didFailWithError。

Question

我正在尝试编写一些代码来检查数据源的URL，然后用该URL中的对象填充一个数组。它实际上工作得很好，但如果web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connection didFailWithError方法从未被调用过。我尝试传递一个简单的字符串，但它不调用。我希望这个应用程序仍然适用于使用ipod touch或处于飞行模式的人。

connection didReceiveResponse工作正常，没有问题。

这就是我要做的。

- (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]); }

-(空)连接：(NSURLConnection*)连接错误：(NSError*)错误{

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

• (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)返回{ listConnectFail = NO；NSLog(@“连接成功，接口填充中”)；}

我知道这可能是我没有看到的愚蠢的事情，但我可以利用帮助来看到我没有看到的东西

提前感谢！

Answer 1

您是如何确认您的代表没有收到消息的？你查过日志了吗？

您的代码似乎假定'listConnectFail‘将在NSURLConnection的初始化完成后立即设置，但事实并非如此。

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

NSURLConnection文档声明“在加载过程中，委派将收到委派消息”。

但是，我不确定飞行模式，也许这个特殊的错误可以同步检测到。