[IOS] a small example of NSURLConnection

[IOS] a small example of NSURLConnection

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NSURLSession can be used after iOS7, but NSURLConnection is used for both iOS6 and iOS6.

@interface ViewController() 
 
  @property (nonatomic,strong) NSMutableData *receivedData;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]                                                cachePolicy:NSURLRequestUseProtocolCachePolicy                                            timeoutInterval:10.0];    NSURLConnection *theConncetion=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];    if (theConncetion) {        _receivedData = [NSMutableData data];    }}-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {    [_receivedData appendData:data];    NSLog(@"Downloading...");}-(void)connectionDidFinishLoading:(NSURLConnection *)connection {    NSLog(@"Finished");}@end
 

You can also directly use Block to send an asynchronous request:

    [NSURLConnection sendAsynchronousRequest:theRequest queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {        NSLog(@"Finished");    }];