iOS 7開發之NSURLSession vs NSURLConnection

通過一個簡單的聯網獲取JSON數據並將其解析 

舉個例子 獲取倫敦的天氣數據

NSString*londonWeatherUrl =@"http://api.openweathermap.org/data/2.5/weather?q=London,uk"; 

//這裏是使用NSURLConnection聯網的方法

NSURLRequest*request = [NSURLRequestrequestWithURL:[NSURLURLWithString:londonWeatherUrl]];

[NSURLConnectionsendAsynchronousRequest:requestqueue:[NSOperationQueuemainQueue]completionHandler:^(NSURLResponse*response,

NSData*data,

NSError*connectionError) {// handle response

}] 

//通過NSURLSession聯網的方法

NSURLSession*session = [NSURLSession sharedSession];
[[session dataTaskWithURL:[NSURLURLWithString:londonWeatherUrl]

completionHandler:^(NSData*data,NSURLResponse*response,

NSError*error) {

// handle response

}] resume]; 

// Use AFNetworking

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

AFJSONRequestOperation *operation =
[AFJSONRequestOperation JSONRequestOperationWithRequest:request

success:^(NSURLRequest *request,NSHTTPURLResponse *response,

id JSON) {// handle response

} failure:nil];[operation start];