NSURLConnection 与 NSData + GCD

使用 NSURLConnection 和 NSData + GCD 进行网络请求

objective-c
NSURL *url = [NSURL URLWithString:@"https://api.example.com/data"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

objective-c
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    // 在接收到服务器的响应后，我们可以初始化一个 NSMutableData 对象来存储响应数据
    self.mutableData = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    // 在接收到服务器返回的数据后，我们可以将数据追加到之前创建的 NSMutableData 对象中
    [self.mutableData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    // 在接收完所有数据后，我们可以对数据进行解析或者展示在界面上
    NSDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:self.mutableData options:kNilOptions error:nil];
    NSLog(@"Received JSON data: %@", jsonData);
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    // 在请求失败时，我们可以根据错误信息进行处理
    NSLog(@"Connection failed with error: %@", error.localizedDescription);
}

objective-c
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    // 在后台线程中进行网络请求
    NSURL *url = [NSURL URLWithString:@"https://api.example.com/data"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    
    // 在主线程中更新界面
    dispatch_async(dispatch_get_main_queue(), ^{
        // 在这里处理响应数据
        NSDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:nil];
        NSLog(@"Received JSON data: %@", jsonData);
    });
});