iOS网络请求，iOS 9新增加了Session请求

//
//  ViewController.m
//  UI_15_session(iOS9网络请求)
//
//  Created by lanou3g on 15/11/13.
//  Copyright © 2015年 lirui. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()<NSURLSessionDataDelegate>
@property(nonatomic,strong)NSMutableData *mutableData;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
#pragma mark session block 网络请求
- (IBAction)session_blockButtonDidClicked:(id)sender {

NSString *baseString = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";
//转化为URL
NSURL *baseURL = [NSURL URLWithString:baseString];

//根据 baseURL 创建网络请求对象
NSMutableURLRequest *requset = [NSMutableURLRequest requestWithURL:baseURL];
//设置参数：1.POST 2.参数体（body）
[requset setHTTPMethod:@"POST"];
//2.body参数
NSString *bodyString = @"date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
NSData *badyData = [bodyString dataUsingEncoding:NSUTF8StringEncoding];
//设置 body（POST参数）
[requset setHTTPBody:badyData];

//iOS 9 提供了 NSURLSession 来代替  NSURLConnection
//首先，创建一个 NSURLSession 对象（如果要使用block来完成网络请求，这个对象可以使用 NSURLSession 自带的单例对象）
NSURLSession *session = [NSURLSession sharedSession];

// session发送网络请求对象

NSURLSessionTask *task = [session dataTaskWithRequest:requset completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
NSLog(@"%@",dict);
}];
//开始网络请求任务
[task resume];

}

#pragma mark session 代理 实现网络请求
- (IBAction)session_delegateButtonDidClicked:(id)sender {

NSString *baseString = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";
NSURL *baseURL = [NSURL URLWithString:baseString];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:baseURL];

[request setHTTPMethod:@"POST"];
NSString *bodyString = @"date=20131129&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
NSData *bodyData = [bodyString dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:bodyData];

//创建 session
//默认的 session 配置，从网络读取数据
NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
//需要遵守 NSURLSessionDataDelegate
NSURLSession *session = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:nil];

//利用 session 发送网络请求
NSURLSessionTask *task = [session dataTaskWithRequest:request];

//初始化接收数据的容器
self.mutableData = [NSMutableData data];

//开始任务
[task resume];

}

#pragma mark 1.收到服务器相应
//-(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler {
//
//    NSLog(@"1");
//
//}

#pragma mark 2.服务器开始传输数据（一点一点返回，这个代理方法会被反复调用，返回 NSData 数据）
-(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {

NSLog(@"2");
[self.mutableData appendData:data];

}
#pragma mark 3.客户端接收数据完成的时候
-(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask willCacheResponse:(NSCachedURLResponse *)proposedResponse completionHandler:(void (^)(NSCachedURLResponse * _Nullable))completionHandler {

NSLog(@"3");

NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:self.mutableData options:NSJSONReadingMutableContainers error:nil];
NSLog(@"%@",dict);
}

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

@end