iOS 多个文件下载和管理 （二）

在前面第一章 点击打开链接 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 ，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