iOS 多个文件下载和管理（二）

向右看齐 2022-06-09 13:22 242阅读 0赞

在前面第一章 [点击打开链接][Link 1] 的时候，介绍了NSURLSessionDownloadTask

这一章节就讲，在一章节的基础上，进一步封装，能管理每个任务

BackgroundDownloadTool  相关代码，看第一章节：[点击打开链接][Link 1] ，这里就不说了

使用：主要演示了，两个任务

#import "ViewController.h"
    #import "DownloadManagement.h"
    
    @interface ViewController () {
        DownloadManagement *DM;
    }
    
    @property (weak, nonatomic) IBOutlet UILabel *label;
    @property (weak, nonatomic) IBOutlet UILabel *label2;
    
    @end
    
    @implementation ViewController
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        DM = [DownloadManagement sharedInstance];
        
        [DM downloadFromURL:@"http://baobab.wdjcdn.com/1455888619273255747085_x264.mp4" fileName:@"test.mp4" identifier: @"one" Progress:^(CGFloat progress, NSError *err) {
            self.label.text = [NSString stringWithFormat:@"%f",progress];
    
        } complement:^(NSString *path) {
            self.label.text = @"100%";
            
        }];
        
        [DM downloadFromURL:@"http://baobab.wdjcdn.com/1455888619273255747085_x264.mp4" fileName:@"test2.mp4" identifier: @"two" Progress:^(CGFloat progress, NSError *err) {
            self.label2.text = [NSString stringWithFormat:@"%f",progress];
    
        } complement:^(NSString *path) {
            self.label2.text = @"100%";
            
        }];
        
    }
    
    - (IBAction)start:(id)sender {
        [DM startOrContinueDownload:@"one"];
    }
    
    - (IBAction)stop:(id)sender {
        [DM pauseDownload:@"one"];
    }
    
    - (IBAction)cancel:(id)sender {
        [DM cancelDownload:@"one"];
    }
    
    - (IBAction)start2:(id)sender {
        [DM startOrContinueDownload:@"two"];
    }
    
    - (IBAction)stop2:(id)sender {
        [DM pauseDownload:@"two"];
    }
    
    - (IBAction)cancel2:(id)sender {
        [DM cancelDownload:@"two"];
    }
    
    - (IBAction)allStart:(id)sender {
        [DM startOrContinueAllTasks];
    }
    
    - (IBAction)allStop:(id)sender {
        [DM pauseAllTasks];
    }
    
    - (IBAction)allCancel:(id)sender {
        [DM cancelAllTasks];
    }
    
    - (IBAction)delete:(id)sender {
        [DM removeDownloadFile:@"one"];
    }
    
    - (IBAction)delete2:(id)sender {
        [DM removeDownloadFile:@"two"];
    }
    
    - (IBAction)delteAll:(id)sender {
        [DM removeAllDownloadFile];
    }
    
    - (IBAction)deleteCache1:(id)sender {
        [DM removeCacheDownloadFile:@"one"];
    }
    
    - (IBAction)deleteCache2:(id)sender {
        [DM removeCacheDownloadFile:@"two"];
    }
    
    - (IBAction)deleteAllCache:(id)sender {
        [DM removeAllCacheDownloadFile];
    }

主要代码：

DownloadManagement.h

#import <Foundation/Foundation.h>
    #import <UIKit/UIKit.h>
    
    @interface DownloadManagement : NSObject
    @property (nonatomic, copy) void (^backgroundSessionCompletionHandler)();
    
    +(DownloadManagement *)sharedInstance;
    
    -(void)startOrContinueDownload:(NSString *)identifier;//开始或继续某个任务
    - (void)startOrContinueAllTasks;//开始或继续所有任务
    
    -(void)pauseDownload:(NSString *)identifier;//暂停某个任务
    - (void)pauseAllTasks;//暂停所有任务
    
    -(void)cancelDownload:(NSString *)identifier;//取消某个任务
    - (void)cancelAllTasks;//取消所有任务
    
    -(void)removeDownloadFile:(NSString *)identifier;//移除已下载好的某个文件
    -(void)removeAllDownloadFile;//移除已下载好的所有文件
    
    -(void)removeCacheDownloadFile:(NSString *)identifier;//移除缓存的某个文件
    -(void)removeAllCacheDownloadFile;//移除缓存的所有文件
    
    - (void)downloadFromURL:(NSString *)urlStr fileName:(NSString *)fileName identifier:(NSString *)identifier Progress:(void (^)(CGFloat progress, NSError *err))downloadProgressBlock complement:(void (^)(NSString *path))completeBlock;
    
    @end

DownloadManagement.m

#import "DownloadManagement.h"
    #import "BackgroundDownloadTool.h"
    
    @interface DownloadManagement ()
    @property(nonatomic,strong)NSMutableDictionary *taskDic;
    @end
    
    @implementation DownloadManagement
    -(NSMutableDictionary *)taskDic {
        if (!_taskDic) {
            _taskDic = [NSMutableDictionary dictionary];
        }
        return _taskDic;
    }
    
    -(instancetype)init{
        if (self = [super init]) {
           
        }
        return self;
    }
    
    +(DownloadManagement *)sharedInstance {
        static dispatch_once_t pred = 0;
        __strong static id internet = nil;
        dispatch_once(&pred, ^{
            internet = [[self alloc] init];
        });
        return internet;
    }
    
    - (void)downloadFromURL:(NSString *)urlStr fileName:(NSString *)fileName identifier:(NSString *)identifier Progress:(void (^)(CGFloat progress, NSError *err))downloadProgressBlock complement:(void (^)(NSString *path))completeBlock {
        if (![self.taskDic.allKeys containsObject:identifier]) {
            BackgroundDownloadTool *tool = [BackgroundDownloadTool new];
            tool.backgroundSessionCompletionHandler = self.backgroundSessionCompletionHandler;
            tool.urlStr = urlStr;
            tool.fileName = fileName;
            tool.identifier = identifier;
            [tool downloadProgress:^(CGFloat progress, NSError *err) {
                downloadProgressBlock(progress,err);
            } complement:^(NSString *path) {
                //[self.taskDic removeObjectForKey:identifier];
                completeBlock(path);
            }];
            [self.taskDic setObject:tool forKey:identifier];
        }
    }
    
    -(void)startOrContinueDownload:(NSString *)identifier {
        BackgroundDownloadTool *tool = self.taskDic[identifier];
        if (tool) {
            [tool startOrContinueDownload];
        }
    }
    
    - (void)startOrContinueAllTasks {
        [self.taskDic enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, BackgroundDownloadTool  *_Nonnull obj, BOOL * _Nonnull stop) {
            [obj startOrContinueDownload];
        }];
    }
    
    -(void)pauseDownload:(NSString *)identifier {
        BackgroundDownloadTool *tool = self.taskDic[identifier];
        if (tool) {
            [tool pauseDownload];
        }
    }
    
    - (void)pauseAllTasks {
        [self.taskDic enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, BackgroundDownloadTool  *_Nonnull obj, BOOL * _Nonnull stop) {
            [obj pauseDownload];
        }];
    }
    
    -(void)cancelDownload:(NSString *)identifier {
        BackgroundDownloadTool *tool = self.taskDic[identifier];
        if (tool) {
            [tool cancelDownload];
        }
    }
    
    - (void)cancelAllTasks {
        [self.taskDic enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, BackgroundDownloadTool  *_Nonnull obj, BOOL * _Nonnull stop) {
            [obj cancelDownload];
        }];
    }
    
    -(void)removeDownloadFile:(NSString *)identifier {
        BackgroundDownloadTool *tool = self.taskDic[identifier];
        if (tool) {
            [tool removeDownloadFile];
        }
    }
    
    -(void)removeAllDownloadFile {
        [self.taskDic enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, BackgroundDownloadTool  *_Nonnull obj, BOOL * _Nonnull stop) {
            [obj removeDownloadFile];
        }];
    }
    
    -(void)removeCacheDownloadFile:(NSString *)identifier {
        BackgroundDownloadTool *tool = self.taskDic[identifier];
        if (tool) {
            [tool removeCacheDownloadFile];
        }
    }
    
    -(void)removeAllCacheDownloadFile {
        [self.taskDic enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, BackgroundDownloadTool  *_Nonnull obj, BOOL * _Nonnull stop) {
            [obj removeCacheDownloadFile];
        }];
    }
    
    @end

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[Link 1]: http://blog.csdn.net/dashenid/article/details/77853511