Ios 如何使用NSLog显示NSURLSession的输出？

我希望使用NSLog显示URl的输出

ViewController.h

@interface ViewController : UIViewController{
NSURLSession *session;
NSString *londonWeatherUrl;
NSURLRequest *request;
}

ViewController.m

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

londonWeatherUrl = @"http://api.openweathermap.org/data/2.5/weather?q=London,uk&appid=2de143494c0b295cca9337e1e96b00e0";

request = [NSURLRequest requestWithURL:
                         [NSURL URLWithString:londonWeatherUrl]];


[[session dataTaskWithURL:[NSURL URLWithString:londonWeatherUrl]
        completionHandler:^(NSData *data,
                            NSURLResponse *response,
                            NSError *error) {}] resume];

session = [NSURLSession sharedSession];
NSLog(@"%@",);  // what goes here ?
}

有人能告诉我在NSLog中需要什么，以便该URL的输出显示在日志中吗。

---

对不起，我是目标C的初学者。

您可以处理响应呼叫：

 - (void)viewDidLoad {
  [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

londonWeatherUrl = @"http://api.openweathermap.org/data/2.5/weather?q=London,uk&appid=2de143494c0b295cca9337e1e96b00e0";

request = [NSURLRequest requestWithURL:
                     [NSURL URLWithString:londonWeatherUrl]];


[[session dataTaskWithURL:[NSURL URLWithString:londonWeatherUrl]
    completionHandler:^(NSData *data,
                          NSURLResponse *response,
                          NSError *error) {
        // handle response
        NSLog(@"%@", response);

 }] resume];
}

---

这是您的回复代码

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

londonWeatherUrl = @"http://api.openweathermap.org/data/2.5/weather?q=London,uk&appid=2de143494c0b295cca9337e1e96b00e0";

request = [NSURLRequest requestWithURL:
                         [NSURL URLWithString:londonWeatherUrl]];


    [[session dataTaskWithURL:[NSURL URLWithString:londonWeatherUrl]
            completionHandler:^(NSData *data,
                                NSURLResponse *response,
                                NSError *error) {

        NSError* error;
        NSDictionary *jsonDictionary = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error]; //Provide your NSData here to convert to dictionary

        //NSArray *responses = [json objectForKey:@"YOUR KEY"]; //Provide your key if contain array or else directly use as dictionary

        NSLog(@"Data dictionary: %@", jsonDictionary);
        NSLog(@"NSURLResponse: %@", response);

}] resume];

session = [NSURLSession sharedSession];    

} 

---

“Url的输出”-你的意思是“响应”@Sandr-是的，响应

NSLog

将转到该完成处理程序（介于

{

和

}

之间）。您的

数据

是完成处理程序的一个参数。您可以以十六进制格式显示该数据，或者必须首先解析它（JSON、UIImage等）。如何访问completionHandler块之外的响应？