Notes

//
// ViewController.m
// _DownloadAsync
//
// Created by STU 10 on 10/04/17.
// Copyright (c) 2017 STU 10. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController


-(void) btnDownloadClicked:(UIButton *) sender{
NSString *urlAsString=@"http://www.apple.com";
NSURL *url=[NSURL URLWithString:urlAsString];
NSURLRequest *urlRequest=[NSURLRequest requestWithURL:url];
NSOperationQueue *queue=[[NSOperationQueue alloc] init];
[NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
if([data length]>0&& connectionError ==nil){
NSString *html=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"%@",html);
}else if([data length]==0 && connectionError==nil){
NSLog(@"Nothing was downloaded.");
}else if(connectionError != nil){
NSLog(@"%@",connectionError);
}
}];
}

- (void)viewDidLoad {
[super viewDidLoad];
[self.btnDownload addTarget:self action:@selector(btnDownloadClicked:) forControlEvents:UIControlEventTouchUpInside];
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end