AFN参考资料
http://www.jianshu.com/p/c36159094e24

作者:要上班的斌哥
链接:http://www.jianshu.com/p/c36159094e24
來源:简书
著作权归作者所有。商业转载请联系作者获得授权,非商业转载请注明出处。

最近在写的一个项目里面涉及到资源包的下载操作,由于用户在使用过程中有可能会同时下载多个资源包,那么就需要对下载功能进行设计和封装。最开始使用的是使用AFN的下载方法来进行实现的,不过当时项目需求要求不是太高,所以没有处理一些特殊情况,比如任务数量的控制,优先级还有断点下载等等。就简单的在一个单例Manager里面添加了一个字典,将下载资源包的URL地址作为Key,对应的downloadTask作为Value,这样就可以在想要的地方获取到相应的下载进度了。

@property (nonatomic, strong, nonnull) NSMutableDictionary <NSString *, NSURLSessionDownloadTask *> *downloadTaskDict;

由于现在需要统一管理下载的资源,而且为了表示“用户至上”,比如节约流量需要使用断点下载,包括暂停和继续、应用重启时的断点下载;显示下载速度和比例等等。同时为了控制下载的速度也对最大下载数量进行了限制,默认3个等等。so.....

先说下原理

这里使用了AFN的下载方法来完成下载功能,只不过需要对其进行一些扩展。因此我将每个下载任务封装成了一个模型<FKNetworkingDownloadModel>,以下为部分属性定义:

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

NS_CLASS_AVAILABLE_IOS(7_0) @interface FKNetworkingProgressModel : NSObject 

/*
* data length of the bytes written.
*/
@property (nonatomic, assign) int64_t totalBytesWritten;
/*
* the total bytes of the resource data.
*/
@property (nonatomic, assign) int64_t totalBytesExpectedToWrite;
/*
* download speed.
*/
@property (nonatomic, assign) int64_t downloadSpeed;
/*
* download progress.
*/
@property (nonatomic, assign) float downloadProgress;
/*
* download left time
*/
@property (nonatomic, assign) int32_t downloadLeft; @end NS_CLASS_AVAILABLE_IOS(7_0) @interface FKNetworkingDownloadModel : NSObject /*
* resource URLString
*/
@property (nonatomic, copy) NSString *resourceURLString;
/*
* fileName default is resourceURLString last component
*/
@property (nonatomic, copy) NSString *fileName;
/**
* file directory
*/
@property (nonatomic, copy) NSString *fileDirectory;
/**
* file path
*/
@property (nonatomic, copy, nullable) NSString *filePath;
/**
* the plist file path, the plist file include information of the download task mission.
*/
@property (nonatomic, copy, nullable) NSString *plistFilePath;
/**
* record the download time when receive the data from the serverce, used to calculate download speed
*/
@property (nonatomic, strong) NSDate *downloadDate;
/**
* check the download state when a model alloc.
*/
//@property (nonatomic, assign) FKDownloadModelState modelState;
/**
* resume data, marked the position of the download mission.
*/
@property (nonatomic, strong, nullable) NSData *resumeData;
/*
* download task
*/
@property (nonatomic, strong, nullable) NSURLSessionDownloadTask *downloadTask;
/*
* progress
*/
@property (nonatomic, strong, nullable) FKNetworkingProgressModel *progressModel;
/**
* init method
*
* @param URLString resourceURLString
*
* @return
*/
-(instancetype)initWithResourceURLString:(NSString *)URLString; @end NS_ASSUME_NONNULL_END

这样可以将每一个下载的资源封装成一个Model,这样在使用管理类来控制下载的时候就会显得比较轻松。

在使用AFN之前需要补充说明一下NSURLSessionTask的一些知识:
抽象类(父类):NSURLSessionTask 包含了一些属性,其中使用到的属性包括:

//请求信息,包括URL地址等。
@property (nullable, readonly, copy) NSURLRequest *originalRequest;
@property (nullable, readonly, copy) NSURLRequest *currentRequest;
//响应信息,包括响应数据的长度和地址等等
@property (nullable, readonly, copy) NSURLResponse *response;
//下面两个属性是会使用到的,一个是已经接收到的数据长度和总共需要接受的数据长度,根据这个我们可以算出下载的进度信息
@property (readonly) int64_t countOfBytesReceived;
@property (readonly) int64_t countOfBytesExpectedToReceive;
//任务描述,我这里用model对应的URL地址来赋值
@property (nullable, copy) NSString *taskDescription;
//状态(取消、完成、进行中等)
@property (readonly) NSURLSessionTaskState state;

同时父类也提供了几个方法

- (void)cancel;//取消下载任务
- (void)suspend;//挂起(这个一般用于程序在运行中的时候暂停下载任务)
- (void)resume;//恢复下载任务

理论上说,如果不做应用重启后的断点下载,通过上面的步骤已经可以完成大部分的下载操作了,但是在程序重启时并不能够获取到对应的已下载的进度(downloadTask会将下载的资源放入tmp路径下面,以'CFNetworking'开头),那这个时候执行下载任务那么会重新下载。考虑到用户的流量,就必须在重启后的进行断点下载,因此我们需要使用到子类NSURLSessionDownloadTask的一个方法

- (void)cancelByProducingResumeData:(void (^)(NSData * __nullable resumeData))completionHandler;

这个方法可以讲当前的task已下载的数据使用一个data保存起来, 然后使用NSURLSession的方法可以根据这个data从服务器获取后续的数据

- (NSURLSessionDownloadTask *)downloadTaskWithResumeData:(NSData *)resumeData;

断点下载的原理大概就是这样,接下来是考虑管理类的设计和封装。

管理类的设计和封装

思路:使用单例来管理下载任务,同时可以指定最大的下载数和单任务和多任务模式的切换。关于下载的控制(开始、暂停、恢复和断点下载)都可以通过AFN相应的方法来实现

ANF里面关于下载有几个方法,在<AFURLSessionManager>类里面可以找到
//这个方法是经常用到的一个,生成一个NSURLRequest,然后根据这个请求开始下载任务可以追踪到下载的进度,需要设置下载完成后的文件移动到的位置,最后是完成后的回调信息
-(NSURLSessionDownloadTask *)downloadTaskWithRequest:(NSURLRequest *)request
progress:(nullable void (^)(NSProgress *downloadProgress)) downloadProgressBlock
destination:(nullable NSURL * (^)(NSURL *targetPath, NSURLResponse *response))destination
completionHandler:(nullable void (^)(NSURLResponse *response, NSURL * _Nullable filePath, NSError * _Nullable error))completionHandler; //该方法根据一个resumeData来进行断点下载,我这里断点下载的实现就是根据这个来的,resumeData已经在模型里面了。
在下载cancel或者suspend的时候只需要将model的resumeData赋值,然后写入本地plist文件,下次下载的时候根据plist信息获取下载的一些信息就OK了
-(NSURLSessionDownloadTask *)downloadTaskWithResumeData:(NSData *)resumeData
progress:(nullable void (^)(NSProgress *downloadProgress)) downloadProgressBlock
destination:(nullable NSURL * (^)(NSURL *targetPath, NSURLResponse *response))destination
completionHandler:(nullable void (^)(NSURLResponse *response, NSURL * _Nullable filePath, NSError * _Nullable error))completionHandler;

下面附上一头文件中的一些代码

#import <Foundation/Foundation.h>
#import "AFNetworking.h"
#import "FKNetworkingDownloadModel.h" NS_ASSUME_NONNULL_BEGIN NS_CLASS_AVAILABLE_IOS(7_0) @interface FKNetworkingManager : NSObject /**
* download root file path. default is '~/cache/forkid.networking.manager1.0'
*/
@property (nonatomic, copy, readonly) NSString *downloadDirectory; /**
* contains the models whose is downloading.
*/
@property (nonatomic, strong, readonly) NSMutableArray <__kindof FKNetworkingDownloadModel *> *downloadingModels; /**
* contains the models whose is waiting for download.
*/
@property (nonatomic, strong, readonly) NSMutableArray <__kindof FKNetworkingDownloadModel *> *waitingModels; /**
* max download mission number.
*/
@property (nonatomic, assign) NSInteger maxDownloadCount; /**
* first in and fisrt out.
*/
@property (nonatomic, assign) BOOL resumeTaskFIFO; /**
* ignore maxDownloadCount. manager will resume all downloadTask.
*/
@property (nonatomic, assign, getter=isBatchDownload) BOOL batchDownload; /**
* singleton
*/
+(FKNetworkingManager *)shareManager; /**
===============> Description of download start <=============
= when you wanna download a file from serverce, you can use next methods as you need.
= there have some methods such as start, resume, cancel and so on.
= We add the 'cancel' method to pause a task instead of suspend, because we need to resume the task when the App restart.
= all methods will use a download model who is subclass of the 'FKNetworkingDownloadModel' for convenience.
= and every model use a URL string as the primary key to mark a download mission or task.
===============> Description of download end. <=============
*/ /**
* this method used to start a download mission with a download model, notice that the download model can't be nil, or the download mission will not execute.
*
* @param downloadModel download model
* @param progress progress of the download, track to refresh UI and ...
* @param completionHandler you can doing something after download mission completed, such as refresh your UI and move the file and so on.
*/
-(void)fk_startDownloadWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel
progress:(void (^)(FKNetworkingDownloadModel *downloadModel))progress
completionHandler:(void (^)(FKNetworkingDownloadModel *downloadModel, NSError * _Nullable error))completionHandler; /**
* resume a download task with a download model, it will use the download model's 'resumeData'
*
* @param downloadModel download model
*/
-(void)fk_resumeDownloadWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel; /**
* suspend or cancel a download task
*
* @param downloadModel download model
*/
-(void)fk_cancelDownloadTaskWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel; /**
* check the resourece has been downloaded or not from the download model resourceURL.
*
* @param downloadModel download model
*
* @return YES or NO.
*/
-(BOOL)fk_hasDownloadedFileWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel; /**
* delete local file if exist.
*
* @param downloadModel download model.
*/
-(void)fk_deleteDownloadedFileWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel; /**
* delete all downloaded files.
*/
-(void)fk_deleteAllDownloadedFiles; /**
* get a download model, which is downloading with a URLString. if there is not exist a model, will return nil.
*
* @param URLString URLString.
*
* @return download model
*/
-(nullable FKNetworkingDownloadModel *)fk_getDownloadingModelWithURLString:(NSString *)URLString; /**
* get download progress information. such as download speed, progress and so on.
*
* @param downloadModel download model.
*
* @return progress model.
*/
-(nullable FKNetworkingProgressModel *)fk_getDownloadProgressModelWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel;
@end
NS_ASSUME_NONNULL_END

定义完上述的方法后,在实现文件中实现相应的方法即可,因为采用AFN,所以我们不用写太多的步骤,只需要关心流程控制,和线程控制就行了。

下面是部分的实现代码:

#import "FKNetworkingManager.h"
#import "NSObject+FKAdd.h" NSString *const FKNetworkingManagerFileName = @"forkid.networking.manager1.0"; @interface FKNetworkingManager () /**
* AFNetworking manager.
*/
@property (nonatomic, strong) AFHTTPSessionManager *AFManager; /**
* download root directory.
*/
@property (nonatomic, copy) NSString *downloadDirectory; /**
* fileManager to manage download files
*/
@property (nonatomic, strong) NSFileManager *fileManager; /*
* the models for waiting for download, the elements should be FKDownloadModel and it's subClasses
*/
@property (nonatomic, strong) NSMutableArray <__kindof FKNetworkingDownloadModel *> *waitingModels; /*
* the models whose being downloaded, the elements should be FKDownloadModel and it's subClasses
*/
@property (nonatomic, strong) NSMutableArray <__kindof FKNetworkingDownloadModel *> *downloadingModels; /*
* key-values dictionary of the downloadModels, format as '<NSString *key, FKDownloadModel *model>' to make constraints
* used to find a downloadModel from this container,
* when the program will terminate, container will be clear
*/
@property (nonatomic, strong) NSMutableDictionary <NSString *, __kindof FKNetworkingDownloadModel *> *downloadModelsDict; @end NSInteger const fk_timeInterval = 5; @implementation FKNetworkingManager #pragma mark - download methods -(void)fk_startDownloadWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel
progress:(void (^)(FKNetworkingDownloadModel * _Nonnull))progress
completionHandler:(void (^)(FKNetworkingDownloadModel * _Nonnull, NSError * _Nullable))completionHandler{ NSString *fileName = [downloadModel.fileName componentsSeparatedByString:@"."].firstObject;
downloadModel.fileDirectory = [self.downloadDirectory stringByAppendingPathComponent:fileName];
downloadModel.filePath = [[self.downloadDirectory stringByAppendingPathComponent:fileName] stringByAppendingPathComponent:downloadModel.fileName];
downloadModel.plistFilePath = [downloadModel.fileDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist", fileName]]; if (![self canBeStartDownloadTaskWithDownloadModel:downloadModel]) return; downloadModel.resumeData = [NSData dataWithContentsOfFile:downloadModel.plistFilePath]; if (downloadModel.resumeData.length == 0) {
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:downloadModel.resourceURLString]];
downloadModel.downloadTask = [self.AFManager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) { [self setValuesForDownloadModel:downloadModel withProgress:downloadProgress.fractionCompleted];
progress(downloadModel); } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) { return [NSURL fileURLWithPath:downloadModel.filePath]; } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
if (error) {
[self fk_cancelDownloadTaskWithDownloadModel:downloadModel];
completionHandler(downloadModel, error);
}else{
[self.downloadModelsDict removeObjectForKey:downloadModel.resourceURLString];
completionHandler(downloadModel, nil);
[self deletePlistFileWithDownloadModel:downloadModel];
}
}]; }else{ downloadModel.progressModel.totalBytesWritten = [self getResumeByteWithDownloadModel:downloadModel];
downloadModel.downloadTask = [self.AFManager downloadTaskWithResumeData:downloadModel.resumeData progress:^(NSProgress * _Nonnull downloadProgress) { [self setValuesForDownloadModel:downloadModel withProgress:[self.AFManager downloadProgressForTask:downloadModel.downloadTask].fractionCompleted];
progress(downloadModel); } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
return [NSURL fileURLWithPath:downloadModel.filePath];
} completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
if (error) {
[self fk_cancelDownloadTaskWithDownloadModel:downloadModel];
completionHandler(downloadModel, error);
}else{
[self.downloadModelsDict removeObjectForKey:downloadModel.resourceURLString];
completionHandler(downloadModel, nil);
[self deletePlistFileWithDownloadModel:downloadModel];
}
}];
} if (![self.fileManager fileExistsAtPath:self.downloadDirectory]) {
[self.fileManager createDirectoryAtPath:self.downloadDirectory withIntermediateDirectories:YES attributes:nil error:nil];
} [self createFolderAtPath:[self.downloadDirectory stringByAppendingPathComponent:fileName]];
[self fk_resumeDownloadWithDownloadModel:downloadModel];
} -(void)fk_resumeDownloadWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel{
if (downloadModel.downloadTask) {
downloadModel.downloadDate = [NSDate date];
[downloadModel.downloadTask resume];
self.downloadModelsDict[downloadModel.resourceURLString] = downloadModel;
[self.downloadingModels addObject:downloadModel];
}
} -(void)fk_cancelDownloadTaskWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel{
if (!downloadModel) return;
NSURLSessionTaskState state = downloadModel.downloadTask.state;
if (state == NSURLSessionTaskStateRunning) {
[downloadModel.downloadTask cancelByProducingResumeData:^(NSData * _Nullable resumeData) {
downloadModel.resumeData = resumeData;
@synchronized (self) {
BOOL isSuc = [downloadModel.resumeData writeToFile:downloadModel.plistFilePath atomically:YES];
[self saveTotalBytesExpectedToWriteWithDownloadModel:downloadModel];
if (isSuc) {
downloadModel.resumeData = nil;
[self.downloadModelsDict removeObjectForKey:downloadModel.resourceURLString];
[self.downloadingModels removeObject:downloadModel];
}
}
}];
}
} -(void)fk_deleteDownloadedFileWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel{
if ([self.fileManager fileExistsAtPath:downloadModel.fileDirectory]) {
[self.fileManager removeItemAtPath:downloadModel.fileDirectory error:nil];
}
} -(void)fk_deleteAllDownloadedFiles{
if ([self.fileManager fileExistsAtPath:self.downloadDirectory]) {
[self.fileManager removeItemAtPath:self.downloadDirectory error:nil];
}
} -(BOOL)fk_hasDownloadedFileWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel{
if ([self.fileManager fileExistsAtPath:downloadModel.filePath]) {
NSLog(@"已下载的文件...");
return YES;
}
return NO;
} -(FKNetworkingDownloadModel *)fk_getDownloadingModelWithURLString:(NSString *)URLString{
return self.downloadModelsDict[URLString];
} -(FKNetworkingProgressModel *)fk_getDownloadProgressModelWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel{
FKNetworkingProgressModel *progressModel = downloadModel.progressModel;
progressModel.downloadProgress = [self.AFManager downloadProgressForTask:downloadModel.downloadTask].fractionCompleted;
return progressModel;
} #pragma mark - private methods
-(BOOL)canBeStartDownloadTaskWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel{
if (!downloadModel) return NO;
if (downloadModel.downloadTask && downloadModel.downloadTask.state == NSURLSessionTaskStateRunning) return NO;
if ([self fk_hasDownloadedFileWithDownloadModel:downloadModel]) return NO;
return YES;
} -(void)setValuesForDownloadModel:(FKNetworkingDownloadModel *)downloadModel withProgress:(double)progress{
NSTimeInterval interval = -1 * [downloadModel.downloadDate timeIntervalSinceNow];
downloadModel.progressModel.totalBytesWritten = downloadModel.downloadTask.countOfBytesReceived;
downloadModel.progressModel.totalBytesExpectedToWrite = downloadModel.downloadTask.countOfBytesExpectedToReceive;
downloadModel.progressModel.downloadProgress = progress;
downloadModel.progressModel.downloadSpeed = (int64_t)((downloadModel.progressModel.totalBytesWritten - [self getResumeByteWithDownloadModel:downloadModel]) / interval);
if (downloadModel.progressModel.downloadSpeed != 0) {
int64_t remainingContentLength = downloadModel.progressModel.totalBytesExpectedToWrite - downloadModel.progressModel.totalBytesWritten;
int currentLeftTime = (int)(remainingContentLength / downloadModel.progressModel.downloadSpeed);
downloadModel.progressModel.downloadLeft = currentLeftTime;
}
} -(int64_t)getResumeByteWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel{
int64_t resumeBytes = 0;
NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:downloadModel.plistFilePath];
if (dict) {
resumeBytes = [dict[@"NSURLSessionResumeBytesReceived"] longLongValue];
}
return resumeBytes;
} -(NSString *)getTmpFileNameWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel{
NSString *fileName = nil;
NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:downloadModel.plistFilePath];
if (dict) {
fileName = dict[@"NSURLSessionResumeInfoTempFileName"];
}
return fileName;
} -(void)createFolderAtPath:(NSString *)path{
if ([self.fileManager fileExistsAtPath:path]) return;
[self.fileManager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
} -(void)deletePlistFileWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel{
if (downloadModel.downloadTask.countOfBytesReceived == downloadModel.downloadTask.countOfBytesExpectedToReceive) {
[self.fileManager removeItemAtPath:downloadModel.plistFilePath error:nil];
[self removeTotalBytesExpectedToWriteWhenDownloadFinishedWithDownloadModel:downloadModel];
}
} -(NSString *)managerPlistFilePath{
return [self.downloadDirectory stringByAppendingPathComponent:@"ForKidManager.plist"];
} -(nullable NSMutableDictionary <NSString *, NSString *> *)managerPlistDict{
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithContentsOfFile:[self managerPlistFilePath]];
return dict;
} -(void)saveTotalBytesExpectedToWriteWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel{
NSMutableDictionary <NSString *, NSString *> *dict = [self managerPlistDict];
[dict setValue:[NSString stringWithFormat:@"%lld", downloadModel.downloadTask.countOfBytesExpectedToReceive] forKey:downloadModel.resourceURLString];
[dict writeToFile:[self managerPlistFilePath] atomically:YES];
} -(void)removeTotalBytesExpectedToWriteWhenDownloadFinishedWithDownloadModel:(FKNetworkingDownloadModel *)downloadModel{
NSMutableDictionary <NSString *, NSString *> *dict = [self managerPlistDict];
[dict removeObjectForKey:downloadModel.resourceURLString];
[dict writeToFile:[self managerPlistFilePath] atomically:YES];
} #pragma mark - share instance
+(FKNetworkingManager *)shareManager{
static FKNetworkingManager *manager = nil;
static dispatch_once_t sigletonOnceToken;
dispatch_once(&sigletonOnceToken, ^{
manager = [[self alloc] init];
});
return manager;
} - (instancetype)init{
self = [super init];
if (self) {
_AFManager = [[AFHTTPSessionManager alloc]init];
_AFManager.requestSerializer.timeoutInterval = 5;
_AFManager.requestSerializer.cachePolicy = NSURLRequestReloadIgnoringLocalCacheData;//NSURLRequestUseProtocolCachePolicy;
NSSet *typeSet = [NSSet setWithObjects:@"application/json", @"text/plain", @"text/javascript", @"text/json", @"text/html", nil];
_AFManager.responseSerializer.acceptableContentTypes = typeSet;
_AFManager.securityPolicy.allowInvalidCertificates = YES; _maxDownloadCount = 1;
_resumeTaskFIFO = YES;
_batchDownload = NO;
_fileManager = [NSFileManager defaultManager];
_waitingModels = [[NSMutableArray alloc] initWithCapacity:1];
_downloadingModels = [[NSMutableArray alloc] initWithCapacity:1];
_downloadModelsDict = [[NSMutableDictionary alloc] initWithCapacity:1]; _downloadDirectory = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).firstObject stringByAppendingPathComponent:FKNetworkingManagerFileName];
[_fileManager createDirectoryAtPath:_downloadDirectory withIntermediateDirectories:YES attributes:nil error:nil]; NSDictionary <NSString *, NSString *> *plistDict = [[NSDictionary alloc] init];
NSString *managerPlistFilePath = [_downloadDirectory stringByAppendingPathComponent:@"ForKidManager.plist"];
[plistDict writeToFile:managerPlistFilePath atomically:YES];
}
return self;
} @end

转自:http://www.jianshu.com/p/f311f7057faa

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