一、原生代碼
NSURLSession里面用三個(gè)任務(wù) NSURLSessionDataTask、NSURLSessionDownloadTask、NSURLSessionUploadTask
.h
#import <Foundation/Foundation.h>
@protocol FileDownLoadDelegate <NSObject>
@optional
- (void)backDownprogress:(float)progress tag:(NSInteger)tag;
- (void)downSucceed:(NSURL*)url tag:(NSInteger)tag;
- (void)downError:(NSError*)error tag:(NSInteger)tag;
@end
@interface FileDownloadNetWorkNative : NSObject
@property (nonatomic, strong) NSURLSession* session;
@property (nonatomic, strong) NSURLSessionDownloadTask* downloadTask;
@property (nonatomic, strong) NSData* resumeData;
@property (nonatomic, weak) id<FileDownLoadDelegate> myDeleate;
@property (nonatomic, assign) NSInteger tag;//某個(gè)文件下載的的標(biāo)記
///單例
+(instancetype)shareManagerDownLoad;
///fileUrl:下載地址
-(void)downFile:(NSString*)fileUrl;
///暫?；蛘呃^續(xù)下載
-(void)suspendDownload;
///取消下載
-(void)cancelDownload;
@end
.m
#import "FileDownloadNetWorkNative.h"
#import <CommonCrypto/CommonDigest.h>
@interface FileDownloadNetWorkNative ()<NSURLSessionDelegate>
@property (nonatomic) BOOL mIsSuspend;
@end
@implementation FileDownloadNetWorkNative
//閃退或者強(qiáng)制退出 初始化該方法會(huì)走didCompleteWithError代理方法
+(instancetype)shareManagerDownLoad{
static FileDownloadNetWorkNative *shareManager = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
shareManager = [[self alloc] init];
});
return shareManager;
}
- (instancetype)init
{
self = [super init];
if (self) {
NSURLSessionConfiguration *config = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:@"com.lingxin.app2"];
// 允許蜂窩網(wǎng)絡(luò): 你可以做偏好設(shè)置
config.allowsCellularAccess = YES;
config.timeoutIntervalForRequest = 30;
// 創(chuàng)建一個(gè)下載線程
self.session = [NSURLSession sessionWithConfiguration:config
delegate:self
delegateQueue:[NSOperationQueue mainQueue]];
}
return self;
}
-(void)downFile:(NSString *)fileUrl{
if (!fileUrl || fileUrl.length == 0 || ![self checkIsUrlAtString:fileUrl]) {
NSLog(@"fileUrl 無效");
return ;
}
NSURL *url = [NSURL URLWithString:fileUrl];
NSURLSessionDownloadTask *downloadTask = nil;
NSData *resumeData = [self getResumeData:fileUrl];
if (resumeData.length>0) {//斷點(diǎn)續(xù)傳
downloadTask = [self.session downloadTaskWithResumeData:resumeData];
}else{//重新開始下載
downloadTask = [self.session downloadTaskWithURL:url];
}
self.downloadTask = downloadTask;
[downloadTask resume];
}
#pragma mark - NSURLSessionDelegate
/* 下載過程中調(diào)用，用于跟蹤下載進(jìn)度
* bytesWritten為單次下載大小
* totalBytesWritten為當(dāng)當(dāng)前一共下載大小
* totalBytesExpectedToWrite為文件大小
*/
//每次傳一個(gè)包 調(diào)用一次該函數(shù) 512M
-(void)URLSession:(nonnull NSURLSession *)session downloadTask:(nonnull NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite{
float dowProgeress = 1.0 * totalBytesWritten / totalBytesExpectedToWrite;
// NSLog(@"??????進(jìn)度：%f",dowProgeress);
if (self.myDeleate && [self.myDeleate respondsToSelector:@selector(backDownprogress:tag:)]) {
[self.myDeleate backDownprogress:dowProgeress tag:self.tag];
}
}
/*
2.下載完成之后調(diào)用該方法
*/
-(void)URLSession:(nonnull NSURLSession *)session downloadTask:(nonnull NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(nonnull NSURL *)location{
NSString *url = downloadTask.currentRequest.URL.absoluteString;
// 文件儲(chǔ)存路徑
NSString *storagePath = [self downLoadSuccessDataDiskTmpPath:url];
//創(chuàng)建文件管理器
NSFileManager *manager = [NSFileManager defaultManager];
if ([manager fileExistsAtPath: storagePath]) {
//如果文件夾下有同名文件 則將其刪除
[manager removeItemAtPath:storagePath error:nil];
}
NSError *saveError;
// 把緩存文件移動(dòng)到指定的沙盒路徑
[manager moveItemAtURL:location toURL:[NSURL fileURLWithPath:storagePath] error:&saveError];
dispatch_async(dispatch_get_main_queue(), ^{
NSURL *url = [[NSURL alloc]initFileURLWithPath:storagePath];
if(self.myDeleate && [self.myDeleate respondsToSelector:@selector(downSucceed:tag:)])
[self.myDeleate downSucceed:url tag:self.tag];
});
NSString *resumeDataPath = [self resumeDataDiskTmpPath:url];
if ([manager fileExistsAtPath:resumeDataPath]) {//刪除磁盤中的緩存數(shù)據(jù)
[manager removeItemAtPath:resumeDataPath error:nil];
}
if ([manager fileExistsAtPath:location.path]) {
[manager removeItemAtPath:location.path error:nil];
}
}
/* 在任務(wù)下載完成、下載失敗
* 或者是應(yīng)用被殺掉后，重新啟動(dòng)應(yīng)用并創(chuàng)建相關(guān)identifier的Session時(shí)調(diào)用
*/
//下載失敗和完成都會(huì)調(diào)用，cancel時(shí)錯(cuò)誤為-999
-(void)URLSession:(nonnull NSURLSession *)session task:(nonnull NSURLSessionTask *)task didCompleteWithError:(nullable NSError *)error{
NSString *url = task.currentRequest.URL.absoluteString;
NSString *resumeDataPath = [self resumeDataDiskTmpPath:url];
if (error) {
if(error && self.myDeleate && [self.myDeleate respondsToSelector:@selector(downError:tag:)] && error.code != -999){//回調(diào)非取消時(shí)的錯(cuò)誤
[self.myDeleate downError:error tag:self.tag];
}
NSData *resumeData = [error.userInfo objectForKey:NSURLSessionDownloadTaskResumeData];
[resumeData writeToFile:resumeDataPath atomically:NO];
}else{//成功時(shí)調(diào)用
if (self.myDeleate && [self.myDeleate respondsToSelector:@selector(backDownprogress:tag:)]) {
[self.myDeleate backDownprogress:1 tag:self.tag];//解決后臺(tái)情況下下載完成后進(jìn)度條沒有更新的問題
}
}
}
/* 應(yīng)用在后臺(tái)，而且后臺(tái)所有下載任務(wù)完成后，
* 在所有其他NSURLSession和NSURLSessionDownloadTask委托方法執(zhí)行完后回調(diào)，
* 可以在該方法中做下載數(shù)據(jù)管理和UI刷新
*最好將handleEventsForBackgroundURLSession中completionHandler保存，在該方法中待所有載數(shù)據(jù)管理和UI刷新做完后，再調(diào)用completionHandler()
*/
- (void)URLSessionDidFinishEventsForBackgroundURLSession:(NSURLSession *)session{
// 調(diào)用在 -application:handleEventsForBackgroundURLSession: 中保存的 handler
NSLog(@"所有后臺(tái)任務(wù)已經(jīng)完成: %@",session.configuration.identifier);
}
/* 下載恢復(fù)時(shí)調(diào)用
* 在使用downloadTaskWithResumeData:方法獲取到對(duì)應(yīng)NSURLSessionDownloadTask，
* 并該task調(diào)用resume的時(shí)候調(diào)用
*/
- (void)URLSession:(NSURLSession *)session
downloadTask:(NSURLSessionDownloadTask *)downloadTask
didResumeAtOffset:(int64_t)fileOffset
expectedTotalBytes:(int64_t)expectedTotalBytes{
}
#pragma mark - private
//暫停下載
-(void)suspendDownload{
if (self.mIsSuspend) {
[self.downloadTask resume];
}else{
[self.downloadTask suspend];
}
self.mIsSuspend = !self.mIsSuspend;
}
//取消下載
-(void)cancelDownload{
__weak typeof(self) weakSelf = self;
[self.downloadTask cancelByProducingResumeData:^(NSData * _Nullable resumeData) {
// weakSelf.downloadTask = nil;
// [resumeData writeToFile:[self resumeDataDiskTmpPath:url] atomically:NO];
}];
}
//獲取resumedata數(shù)據(jù)
-(NSData *)getResumeData:(NSString *)url{
NSFileManager *fm = [NSFileManager defaultManager];
NSData *datas = [fm contentsAtPath:[self resumeDataDiskTmpPath:url]];
return datas;
}
//resumeData數(shù)據(jù)臨時(shí)路徑，在library中
-(NSString *)resumeDataDiskTmpPath:(NSString *)url{
NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) firstObject];
NSString *tmpPath = [NSString stringWithFormat:@"%@/resumeDataTmpFile",libraryPath];
NSFileManager *manager = [NSFileManager defaultManager];
BOOL isDir = NO;
// 判斷storePath路徑下文件是否存在，以及storePath路徑是否是存在的目錄
BOOL exist = [manager fileExistsAtPath:tmpPath isDirectory:&isDir];
if (!(isDir == YES && exist == YES)) {
[manager createDirectoryAtPath:tmpPath withIntermediateDirectories:YES attributes:nil error:nil];
}
NSString *filePath = [tmpPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.tmp",[self md5:url]]];//resumeDataTmpFile/
return filePath;
}
//下載成功的數(shù)據(jù)存儲(chǔ)路徑，在document中
-(NSString *)downLoadSuccessDataDiskTmpPath:(NSString *)url{
NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES) firstObject];
NSString *storePath = [NSString stringWithFormat:@"%@/downLoadSuccessFile",documentPath];
NSFileManager *manager = [NSFileManager defaultManager];
BOOL isDir = NO;
// 判斷storePath路徑下文件是否存在，以及storePath路徑是否是存在的目錄
BOOL exist = [manager fileExistsAtPath:storePath isDirectory:&isDir];
if (!(isDir == YES && exist == YES)) {
[manager createDirectoryAtPath:storePath withIntermediateDirectories:YES attributes:nil error:nil];
}
NSString *filePath = [storePath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.mp4",[self md5:url]]];//downLoadSuccessFile/
return filePath;
}
//用url獲取文件名稱 (MD5加密)
- (NSString *)md5:(NSString *)string{
const char *cStr = [string UTF8String];
unsigned char digest[CC_MD5_DIGEST_LENGTH];
CC_MD5(cStr, (CC_LONG)strlen(cStr), digest);
NSMutableString *result = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {
[result appendFormat:@"%02X", digest[i]];
}
return result;
}
- (BOOL)checkIsUrlAtString:(NSString *)url {
NSString *pattern = @"http(s)?://([\\w-]+\\.)+[\\w-]+(/[\\w- ./?%&=]*)?";
NSRegularExpression *regex = [[NSRegularExpression alloc] initWithPattern:pattern options:0 error:nil];
NSArray *regexArray = [regex matchesInString:url options:0 range:NSMakeRange(0, url.length)];
if (regexArray.count > 0) {
return YES;
}else {
return NO;
}
}
- (void)dealloc
{
[self.session invalidateAndCancel];
self.session = nil;
[self.downloadTask cancel];
self.downloadTask = nil;
}
/**
AppDelegate 中要實(shí)現(xiàn)- (void)application:(UIApplication *)application handleEventsForBackgroundURLSession:(NSString *)identifier completionHandler:(void (^)(void))completionHandler//在應(yīng)用處于后臺(tái)，且后臺(tái)下載的所有任務(wù)完成后才會(huì)調(diào)用
在后臺(tái)情況下才會(huì)執(zhí)行-(void)URLSession:(nonnull NSURLSession *)session downloadTask:(nonnull NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(nonnull NSURL *)location方法，-(void)URLSession:(nonnull NSURLSession *)session task:(nonnull NSURLSessionTask *)task didCompleteWithError:(nullable NSError *)error方法，- (void)URLSessionDidFinishEventsForBackgroundURLSession:(NSURLSession *)session方法
*/
@end
二、AFNetworking
.h
#import <Foundation/Foundation.h>
#import <AFNetworking.h>
typedef void (^FileDownLoadSuccessBlock)(NSURL *fileUrlPath ,NSURLResponse * response );
typedef void (^FileDownLoadFailBlock)(NSError* error ,NSInteger statusCode);
typedef void (^FileDownLoadProgress)(CGFloat progress);
@interface FileDownLoadNetwork : NSObject
///單例
+(instancetype)shareManagerDownLoad;
//下載文件
-(NSURLSessionDownloadTask *)downloadFileWithFileUrl:(NSString *)requestUrl progress:(FileDownLoadProgress)progressBlock success:(FileDownLoadSuccessBlock)successBlock failure:(FileDownLoadFailBlock)failBlock;
///根據(jù)url取消下載
-(void)cancelDownloadTaskWithUrl:(NSString *)url;
///根據(jù)task取消下載
-(void)cancelDownloadTask:(NSURLSessionDownloadTask *)task;
///取消所有的下載任務(wù)
- (void)cancelAllCurrentDownLoadTasks;
@end
.m
#import "FileDownLoadNetwork.h"
#import <CommonCrypto/CommonDigest.h>
@interface FileDownLoadNetwork()
/** */
@property (nonatomic,strong) AFURLSessionManager *manager;
/** 為了解決后臺(tái)情況下下載完成后，進(jìn)度條不能及時(shí)更新的問題 ，如果AF的版本是3.0.0-3.1.0則不用使用該字典，這些版本在后臺(tái)下載完成后，progress的block能夠回調(diào)，3.2.0以上的版本在后臺(tái)下載完成后，progress的block不回調(diào)，不能及時(shí)更新進(jìn)度條，所以要使用該字典解決*/
@property (nonatomic,strong) NSMutableDictionary *blockDic;
/** */
//@property (nonatomic,assign) BOOL progressBlockTag;
@end
@implementation FileDownLoadNetwork
- (NSMutableDictionary *)blockDic{
if (!_blockDic) {
_blockDic = [[NSMutableDictionary alloc]init];
}
return _blockDic;
}
+(instancetype)shareManagerDownLoad{
static FileDownLoadNetwork *shareManager = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
shareManager = [[self alloc] init];
});
return shareManager;
}
/**
后臺(tái)下載
下載完成之后殺死app，再創(chuàng)建任務(wù)時(shí)taskIdentifier為1
未下載完成就殺死app，再創(chuàng)建任務(wù)時(shí)taskIdentifier在上個(gè)taskIdentifier的基礎(chǔ)上增加，比如殺死前taskIdentifier的最大值為3，那么創(chuàng)建時(shí)taskIdentifier為4
默認(rèn)下載
只要?dú)⑺繿pp，再創(chuàng)建任務(wù)時(shí)taskIdentifier為1
*/
- (instancetype)init{
self = [super init];
if (self) {
// 配置（可以后臺(tái)下載）
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:@"com.lingxin.app"];
configuration.timeoutIntervalForRequest = 30;
// 是否允許蜂窩網(wǎng)絡(luò)
configuration.allowsCellularAccess = YES;
self.manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
NSLog(@"??????????????????????????????初始化單例");
NSURLSessionDownloadTask *task;
// 下載完成，取消，下載失敗的通知
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(downloadData:)
name:AFNetworkingTaskDidCompleteNotification
object:task];
}
return self;
}
- (NSURLSessionDownloadTask *)downloadFileWithFileUrl:(NSString *)requestUrl progress:(FileDownLoadProgress)progressBlock success:(FileDownLoadSuccessBlock)successBlock failure:(FileDownLoadFailBlock)failBlock{
[self.blockDic setObject:progressBlock forKey:requestUrl];
NSURLSessionDownloadTask *downloadTask = nil;
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:requestUrl]];
NSData *resumeData = [self getResumeData:requestUrl];
NSLog(@"本地存儲(chǔ)的需要續(xù)傳的數(shù)據(jù)長(zhǎng)度為： %ld",resumeData.length);
if (resumeData.length>0) {//斷點(diǎn)續(xù)傳
NSLog(@"斷點(diǎn)續(xù)傳下載");
downloadTask = [self.manager downloadTaskWithResumeData:resumeData progress:^(NSProgress * _Nonnull downloadProgress) {
if (progressBlock) {
progressBlock(1.0 * downloadProgress.completedUnitCount / downloadProgress.totalUnitCount);
NSLog(@"jhl斷點(diǎn)續(xù)傳任務(wù)進(jìn)度：%F",(1.0 * downloadProgress.completedUnitCount / downloadProgress.totalUnitCount));
}
} destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
// targetPath:緩存路徑，在沙盒里的library/cache中，下載成功后targetPath下的緩存數(shù)據(jù)會(huì)被刪除，下載的文件進(jìn)入到了返回的存儲(chǔ)路徑下
return [NSURL fileURLWithPath:[self downLoadSuccessDataDiskTmpPath:requestUrl]];//返回文件存儲(chǔ)路徑
} completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
// filePath：文件存儲(chǔ)路徑
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*)response;
if ([httpResponse statusCode] == 404) {
[[NSFileManager defaultManager] removeItemAtURL:filePath error:nil];
}
if (error) {////取消也會(huì)報(bào)錯(cuò) statusCode為206 error的code為-999
if (failBlock) {
failBlock(error,[httpResponse statusCode]);
}
}else{
if (successBlock) {
successBlock(filePath,response);
}
}
}];
}else{//從頭開始下載
NSLog(@"重新開始下載");
downloadTask = [self.manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) {
if (progressBlock) {
progressBlock(1.0 * downloadProgress.completedUnitCount / downloadProgress.totalUnitCount);
}
NSLog(@"jhl新任務(wù)進(jìn)度：%F",(1.0 * downloadProgress.completedUnitCount / downloadProgress.totalUnitCount));
} destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
return [NSURL fileURLWithPath:[self downLoadSuccessDataDiskTmpPath:requestUrl]];
} completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*)response;
if ([httpResponse statusCode] == 404) {
[[NSFileManager defaultManager] removeItemAtURL:filePath error:nil];
}
if (error) {
if (failBlock) {//取消也會(huì)報(bào)錯(cuò) statusCode為206 error的code為-999
failBlock(error,[httpResponse statusCode]);
}
}else{
if (successBlock) {
successBlock(filePath,response);
}
}
}];
}
[downloadTask resume];
return downloadTask;
}
/**
什么時(shí)候收到通知
1.下載成功時(shí)，此時(shí)error為nil
2.下載失敗時(shí)，如果是取消了，錯(cuò)誤code為-999，如果是網(wǎng)絡(luò)原因，錯(cuò)誤code為-1001
3.任務(wù)還未下載完成，app強(qiáng)制退出或者閃退后，再次進(jìn)入app初始化season時(shí)，此時(shí)收到通知，保存app強(qiáng)制退出或者閃退時(shí)系統(tǒng)幫忙存儲(chǔ)的resumedata，以便斷點(diǎn)續(xù)傳時(shí)使用。
app殺死后系統(tǒng)幫忙存儲(chǔ)resumeData條件：
配置必須使用backgroundSessionConfigurationWithIdentifier:方法
*/
-(void)downloadData:(NSNotification *)notify{
if ([notify.object isKindOfClass:[ NSURLSessionDownloadTask class]]) {
NSURLSessionDownloadTask *task = notify.object;
NSString *url = [task.currentRequest.URL absoluteString];
NSError *error = [notify.userInfo objectForKey:AFNetworkingTaskDidCompleteErrorKey] ;
NSString *resumeDataPath = [self resumeDataDiskTmpPath:url];
NSLog(@"通知里的??????：%@",error);
if (error) {
// code為-1是The request timed out
if (error.code == -1001) {//網(wǎng)絡(luò)原因
}else if (error.code == -999){//取消時(shí)的錯(cuò)誤
NSData *resumeData = [error.userInfo objectForKey:@"NSURLSessionDownloadTaskResumeData"];
// 存儲(chǔ)強(qiáng)制退出或者閃退后系統(tǒng)幫忙存儲(chǔ)的resumedata數(shù)據(jù)
[resumeData writeToFile:resumeDataPath atomically:NO];
}
}else{//下載成功
FileDownLoadProgress progressBlock = [self.blockDic objectForKey:url];
if (progressBlock) {
NSLog(@"??????????：%@",[self.blockDic allValues]);
progressBlock(1.0);//更新進(jìn)度
[self.blockDic removeObjectForKey:url];
}
NSFileManager *manager = [NSFileManager defaultManager];
if ([manager fileExistsAtPath:resumeDataPath]) {
// 移除緩存文件，只有app取消，閃退，強(qiáng)制退出時(shí)resumeDataPath路徑下的文件才會(huì)存在
[manager removeItemAtPath:resumeDataPath error:nil];
NSLog(@"緩沖的resumeData文件已經(jīng)被移除");
}
}
}
}
//獲取resumedata數(shù)據(jù)
-(NSData *)getResumeData:(NSString *)url{
NSFileManager *fm = [NSFileManager defaultManager];
NSData *datas = [fm contentsAtPath:[self resumeDataDiskTmpPath:url]];
return datas;
}
//resumeData數(shù)據(jù)臨時(shí)路徑，在library中
-(NSString *)resumeDataDiskTmpPath:(NSString *)url{
NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) firstObject];
NSString *tmpPath = [NSString stringWithFormat:@"%@/resumeDataTmpFile",libraryPath];
NSFileManager *manager = [NSFileManager defaultManager];
BOOL isDir = NO;
// 判斷storePath路徑下文件是否存在，以及storePath路徑是否是存在的目錄
BOOL exist = [manager fileExistsAtPath:tmpPath isDirectory:&isDir];
if (!(isDir == YES && exist == YES)) {
[manager createDirectoryAtPath:tmpPath withIntermediateDirectories:YES attributes:nil error:nil];
}
NSString *filePath = [tmpPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.tmp",[self md5:url]]];//resumeDataTmpFile/
return filePath;
}
//下載成功的數(shù)據(jù)存儲(chǔ)路徑，在document中
-(NSString *)downLoadSuccessDataDiskTmpPath:(NSString *)url{
NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES) firstObject];
NSString *storePath = [NSString stringWithFormat:@"%@/downLoadSuccessFile",documentPath];
NSFileManager *manager = [NSFileManager defaultManager];
BOOL isDir = NO;
// 判斷storePath路徑下文件是否存在，以及storePath路徑是否是存在的目錄
BOOL exist = [manager fileExistsAtPath:storePath isDirectory:&isDir];
if (!(isDir == YES && exist == YES)) {
[manager createDirectoryAtPath:storePath withIntermediateDirectories:YES attributes:nil error:nil];
}
NSString *filePath = [storePath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.mp4",[self md5:url]]];//downLoadSuccessFile/
return filePath;
}
//用url獲取文件名稱 (MD5加密)
- (NSString *)md5:(NSString *)string{
const char *cStr = [string UTF8String];
unsigned char digest[CC_MD5_DIGEST_LENGTH];
CC_MD5(cStr, (CC_LONG)strlen(cStr), digest);
NSMutableString *result = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {
[result appendFormat:@"%02X", digest[i]];
}
return result;
}
//根據(jù)url取消下載
-(void)cancelDownloadTaskWithUrl:(NSString *)url{
for (NSURLSessionDownloadTask *task in self.manager.downloadTasks) {
if ([task.currentRequest.URL.absoluteString isEqualToString:url]) {
if (task.state == NSURLSessionTaskStateRunning) {
[task cancelByProducingResumeData:^(NSData * _Nullable resumeData) {
}];
}
}
}
}
//根據(jù)task取消下載
-(void)cancelDownloadTask:(NSURLSessionDownloadTask *)task{
if (task.state == NSURLSessionTaskStateRunning) {
[task cancelByProducingResumeData:^(NSData * _Nullable resumeData) {
// 這里也可以存儲(chǔ)resumeData，通知方法downloadData：中也可以存儲(chǔ)
}];
}
}
//停止當(dāng)前所有的下載任務(wù)
- (void)cancelAllCurrentDownLoadTasks{
if ([[self.manager downloadTasks] count] == 0) {
return;
}
for (NSURLSessionDownloadTask *task in [self.manager downloadTasks]) {
if (task.state == NSURLSessionTaskStateRunning) {
[task cancelByProducingResumeData:^(NSData * _Nullable resumeData) {
}];
}
}
}
- (void)dealloc{
[[NSNotificationCenter defaultCenter]removeObserver:self];
}
//獲取當(dāng)前時(shí)間 下載id標(biāo)識(shí)用
- (NSString *)currentDateStr{
NSDate *currentDate = [NSDate date];//獲取當(dāng)前時(shí)間，日期
NSTimeInterval timeInterval = [currentDate timeIntervalSince1970];
return [NSString stringWithFormat:@"%.f",timeInterval];
}
/**
AppDelegate 中要實(shí)現(xiàn)- (void)application:(UIApplication *)application handleEventsForBackgroundURLSession:(NSString *)identifier completionHandler:(void (^)(void))completionHandler//在應(yīng)用處于后臺(tái)，且后臺(tái)下載的所有任務(wù)完成后才會(huì)調(diào)用
app才能在后臺(tái)情況下，執(zhí)行通知和block代碼塊，不實(shí)現(xiàn)的話，當(dāng)app進(jìn)入前臺(tái)時(shí)才能執(zhí)行通知和block代碼塊
*/
@end
demo：https://github.com/jiahonglingkaixinmeiyitian/download.git
