//
//  GCDPage.m
//  BaseProject
//
//  Created by WindShan on 2016/12/9.
//  Copyright © 2016年 WindShan. All rights reserved.
//

#import "GCDPage.h"

@interface GCDPage ()

@end

@implementation GCDPage

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        //子线程异步执行下载任务，防止主线程卡顿
        
        NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];
        NSError *error;
        NSString *htmlData = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];
        
        if (htmlData != nil)
        {
            //异步返回主线程，根据获取的数据，更新UI
            dispatch_async(dispatch_get_main_queue(), ^{
                NSLog(@"根据更新UI界面");
            });
        } else {
            NSLog(@"error when download:%@",error);
        }
    });
}

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

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end