网络热恋之NSURLSession 

//
//  ViewController.m
//  NSURLSession代理简介

#import "ViewController.h"

@interface ViewController ()<NSURLSessionDataDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
}
//这是为了测试而建立的点击屏幕事件。
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    
    //代理 测试
    
    NSURL * url = [NSURL URLWithString:@"http://localhost/login.php?username=haha&password=123"];

    //创建自定义Session
    
    NSURLSession * session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc]init]];
    
    NSURLSessionTask * task = [session dataTaskWithURL:url];
    //开启任务
    [task resume];
    
}
#pragma mark - deleDate
//接受到服务器响应
-(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler
{
    //__FUNCTION__ c语言字符串用s
    NSLog(@"%s",__FUNCTION__);
    
    
    //允许服务器回传数据
    completionHandler(NSURLSessionResponseAllow);
    
}
//接受服务器回传的数据可能执行多次
-(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data{
    
    NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);
    
}
//请求成功或者失败
-(void)URLSession:(NSURLSession *)session didBecomeInvalidWithError:(NSError *)error{
    NSLog(@"%@",error);
}
@end

上面简单介绍了一下

然后我们来看一个demo

其中下载文件的地址，读者可以自己配置

  1 //
  2 //  ViewController.m
  3 //  NSURLSession大文件下载
  4 //
  5 //
  6 
  7 #import "ViewController.h"
  8 
  9 @interface ViewController ()<NSURLSessionDownloadDelegate>
 10 
 11 @property (nonatomic, strong) NSURLSessionDownloadTask * task;
 12 
 13 @property (nonatomic, strong) NSData * resumeData;
 14 
 15 @property (nonatomic, strong) NSURLSession * session;
 16 
 17 @end
 18 
 19 @implementation ViewController
 20 
 21 
 22 - (IBAction)start:(id)sender {
 23     
 24     NSURLSession * session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc] init]];
 25     
 26     self.session = session;
 27 
 28     self.task = [session downloadTaskWithURL:[NSURL URLWithString:[@"http://192.168.1.200/DOM解析.mp4"stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]];
 29     
 30     [self.task resume];
 31 }
 32 
 33 
 34 - (IBAction)pause:(id)sender {
 35     
 36     //暂停就是将任务挂起
 37     
 38     [self.task cancelByProducingResumeData:^(NSData * _Nullable resumeData) {
 39         
 40         //保存已下载的数据
 41         self.resumeData = resumeData;
 42     }];
 43 }
 44 
 45 - (IBAction)resume:(id)sender {
 46     
 47     //可以使用ResumeData创建任务
 48     
 49     self.task = [self.session downloadTaskWithResumeData:self.resumeData];
 50     
 51     //开启继续下载
 52     [self.task resume];
 53     
 54 }
 55 
 56 - (void)viewDidLoad {
 57     [super viewDidLoad];
 58     // Do any additional setup after loading the view, typically from a nib.
 59     
 60     NSLog(@"%@",NSSearchPathForDirectoriesInDomains(9, 1, 1));
 61 }
 62 
 63 
 64 /* 
 65  
 66  监测临时文件下载的数据大小，当每次写入临时文件时，就会调用一次
 67  
 68  bytesWritten 单次写入多少
 69  totalBytesWritten  已经写入了多少
 70  totalBytesExpectedToWrite 文件总大小
 71  
 72  */
 73 
 74 - (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
 75       didWriteData:(int64_t)bytesWritten
 76  totalBytesWritten:(int64_t)totalBytesWritten
 77 totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite {
 78     
 79     //打印下载百分比
 80     NSLog(@"%f",totalBytesWritten * 1.0 / totalBytesExpectedToWrite);
 81     
 82 }
 83 
 84 //下载完成
 85 
 86 - (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
 87 didFinishDownloadingToURL:(NSURL *)location {
 88     
 89     
 90     NSString * cachesPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:downloadTask.response.suggestedFilename];
 91     
 92     NSFileManager * mgr = [NSFileManager defaultManager];
 93     
 94     [mgr moveItemAtURL:location toURL:[NSURL fileURLWithPath:cachesPath] error:NULL];
 95     
 96 }
 97 
 98 - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {
 99     
100     NSLog(@"%@",error);
101 }
102 
103 - (void)didReceiveMemoryWarning {
104     [super didReceiveMemoryWarning];
105     // Dispose of any resources that can be recreated.
106 }
107 
108 @end

 

posted @ 2016-04-12 09:29  憧憬眼前的鱼  阅读(194)  评论(0)  编辑  收藏  举报