objective-c - NSURLConnection 委托(delegate)方法未被调用

Question

我正在尝试使用 NSURLConnection 的委托(delegate)方法。当前未调用以下方法:

- (void)connectionDidFinishLoading:(NSURLConnection *)connection;

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge;
//I also want to be able to use self-signed https urls

- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace;
//I also want to be able to use self-signed https urls

我目前正在使用同步调用，但异步似乎更好，因为在我完成代码库后，我将把它实现到一个 iPhone 应用程序中，我不能让我的 ui 卡住。

用下面的方法responseData = [NSMutableData dataWithData:[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error]];

我取回了我需要的数据，但是使用异步我似乎必须使用委托(delegate)方法来取回数据。我尝试使用 @interface myClass : NSObject<NSURLConnectionDelegate> 添加委托(delegate)

我按如下方式调用我的方法:

-(void)grabData{
    NSArray* array = [NSArray arrayWithObjects:@"auth.login",@"user",@"pass", nil];
    NSData* packed_array = [array messagePack];

    NSURL* url = [NSURL URLWithString:@"https://192.168.1.115:3790/"];
    NSMutableURLRequest* request = [[[NSMutableURLRequest alloc]initWithURL:url]retain];
    [request setHTTPMethod:@"POST"];
    [request setValue:@"RPC Server" forHTTPHeaderField:@"Host"];
    [request setValue:@"binary/message-pack" forHTTPHeaderField:@"Content-Type"];
    [request setValue:[NSString stringWithFormat:@"%d",[packed_array length]] forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody:packed_array];

    //NSHTTPURLResponse *response = nil;
    NSError *error = nil;

    NSLog(@"connecting");
    NSURLConnection* connection = [[[NSURLConnection alloc]initWithRequest:request delegate:self]retain];
    if (connection) {
        NSLog(@"connection exists");
        self.responseData = [[NSMutableData data]retain];
    }
    else {
        NSLog(@"Connection doesn't exist?");
    }
    NSLog(@"response data: %@",[responseData messagePackParse]);
    NSLog(@"error: %@",error);
}

我尝试了以下操作:

NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection start];

Answer 1

我继续搜索相关问题，找到this answer most helpful .它引导我使用以下方法。首先，我在我的接口(interface)中声明了一个名为 finished 的 BOOL 属性，并在我的实现中添加了以下方法，这导致我的委托(delegate)方法被调用。

while(!finished) {
    [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
}