iOS原生态网络请求

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    
    NSString *urlString=@“网址·······”;
    NSURL *url=[[NSURL alloc] initWithString:urlString];
    NSURLRequest *request=[[NSURLRequest alloc] initWithURL:url];
    
    NSURLConnection *connection=[NSURLConnection connectionWithRequest:request delegate:self];
    [connection start];

    return YES;
}

//NSURLConnectionDelegate的方法
//请求失败时回调
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
    NSLog(@"请求失败，原因：%@",error);
}



//NSURLConnectionDataDelegate的方法
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
    NSLog(@"收到响应");
}

//请求收到数据时的回调，当数据量很大时，会多次回调
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
    NSLog(@"收到数据");
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
    NSLog(@"请求完成");
}

以上是一个简单的网络请求，可接收数据，可接收error