iOS 多线程编程<十七、NSURLSession的基本用法>

来源：互联网发布：矩阵 w什么意思编辑：程序博客网时间：2024/05/20 08:27
苹果推出NSURLSession是为了代替NSURLConnection

看一下NSURLSession的基本用法：代码如下

<span style="font-size:10px;">////  ViewController.m//  NSURLSession////  Created by fe on 2016/11/7.//  Copyright © 2016年 fe. All rights reserved.//#import "ViewController.h"@interface ViewController ()<NSURLSessionDataDelegate>@end@implementation ViewController- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    [self sessionDelegate];}- (void)get1{    //1:创建URLSession    NSURLSession *session = [NSURLSession sharedSession];        //2:根据会话对象来创建task    /*     第一个参数：请求对象     第二个参数：data：响应体     response：响应头     error：错误信息     */    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.baidu.com"]];    NSURLSessionDataTask *dataTask  =  [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {        NSLog(@"%@---%@",error,[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]);            }];        [dataTask resume];}- (void)get2{    //1:创建URLSession    NSURLSession *session = [NSURLSession sharedSession];        //2:根据会话对象来创建task    /*     第一个参数：请求对象     第二个参数：data：响应体     response：响应头     error：错误信息     */    NSURL *url = [NSURL URLWithString:@"https://www.baidu.com"];    NSURLSessionDataTask *dataTask  =  [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {            }];                                            [dataTask resume];}- (void)sessionDelegate{    //1:创建session，并设置代理    /*     第一个参数：配置信息     第三个参数：控制代理方法在哪个线程调用     */    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]];    //2:创建task    NSURLSessionTask *dataTask = [session dataTaskWithURL:[NSURL URLWithString:@"https://www.baidu.com"]];    //3:启动    [dataTask resume];}#pragma mark - NSURLSessionDataDelegate -- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTaskdidReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler;{    /*     NSURLSessionResponseCancel = 0   取消（默认）     NSURLSessionResponseAllow = 1    允许接受数据     NSURLSessionResponseBecomeDownload = 2     NSURLSessionResponseBecomeStream     */    //请求策略，如果不设置请求策略，默认为NSURLSessionResponseCancel，则接收不到数据    completionHandler(NSURLSessionResponseAllow);}- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask    didReceiveData:(NSData *)data;{    }- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error{    }@end</span>
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