ios Objective-c 网络请求

通过链接获取页面请求到的数据

	NSString *urlString = @"http://www.baidu.com";

	urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
    
    NSURL *url = [NSURL URLWithString:urlString];
    
    NSURLRequest