iOS开发网络篇之TZHFileManager使用介绍,文件附件下载、大文件下载、断点下载,下载至本地的本地文件查看,内存大小显示与删除

在项目里遇到附件的下载和本地查看功能,附件有可能是word pdf 图片 Excel表格 甚至是ppt 有点变态吧,大致就是点击下图的附件按钮然后查看附件:

screenshot.png

实现起来的具体思路就是文件的下载,和下载好的本地文件的查看两部分. 本人还是比较懒的,所以去著名的程序员单身交友网github上看看有没有好用的第三方框架,下了好几款,但是总结一下:都不太好用,所以就决定自己写一个顺手的.好了,废话不多说,下面具体的阐述我是怎么实现的:(demo已上传到github 点击查看: https://github.com/TZHui/TZHFileManager)

最重要的是首先创建一个TZHDownloadManager文件下载管理类.下面直接po代码,在.h文件中

import <Foundation/Foundation.h>

@interface TZHDownloadManager : NSObject

@property(nonatomic,strong)NSString *fileName;

+(instancetype)shared;

//异步下载的方法 进度的block
-(void)downloadAudioWithURL:(NSURL *)url andFormat:(NSString *)format progress:(void(^)(float progress))progressBlock complete:(void(^)(NSString *fileSavePath,NSError *error))completeBlock;

//判断是否正在下载
-(BOOL)isDownloadingAudioWithURL:(NSURL *)url;

//取消下载
-(void)cancelDownloadingAudioWithURL:(NSURL *)url andFormat:(NSString *)format complete:(void (^)())completeBlock;

//显示文件占内存大小
+(NSString *)getFileCacheSize;
//删除文件

+(void)deleteFileFromCache;

@end

在TZHDownloadManager.m文件中

import "TZHDownloadManager.h"

import "NSString+Hash.h"

@interface TZHDownloadManager ()<NSURLSessionDownloadDelegate>

@property (nonatomic, strong) NSURLSession *session;
@property(nonatomic,strong)NSString *fileForm;

@end
@implementation TZHDownloadManager{
//保存下载任务对应的进度block 和 完成的block
NSMutableDictionary *_progressBlocks;
NSMutableDictionary *_completeBlocks;
NSMutableDictionary *_downloadTasks;
}

static id _instance;

+(instancetype)shared{

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

    _instance = [[self alloc] init];
});
return _instance;

}

-(instancetype)init {
self = [super init];

if (self) {
    _progressBlocks = [NSMutableDictionary dictionary];
    _completeBlocks = [NSMutableDictionary dictionary];
    _downloadTasks = [NSMutableDictionary dictionary];
}
return self;

}

-(NSURLSession *)session {
if (!_session) {
NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];

    _session = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:[NSOperationQueue mainQueue]];
}
return _session;

}

-(BOOL)isDownloadingAudioWithURL:(NSURL *)url {

if (_completeBlocks[url]) {
    return YES;
}
return NO;

}

-(void)cancelDownloadingAudioWithURL:(NSURL *)url andFormat:(NSString *)format complete:(void (^)())completeBlock {

NSURLSessionDownloadTask *currentTask = _downloadTasks[url];

// 2.cancel
if (currentTask) {

    [currentTask cancelByProducingResumeData:^(NSData *_Nullable resumeData) {

        [resumeData writeToFile:[self getResumeDataPathWithURL:url andFormat:format] atomically:YES];

        //把取消成功的结果返回
        if (completeBlock) {
          completeBlock();
       }

       _progressBlocks[url] = nil;
       _completeBlocks[url] = nil;
       _downloadTasks[url] = nil;

    }];
}

}

//入口
-(void)downloadAudioWithURL:(NSURL *)url andFormat:(NSString *)format progress:(void (^)(float progress))progressBlock complete:(void (^)(NSString *fileSavePath, NSError *error))completeBlock {

NSFileManager *fileMan = [NSFileManager defaultManager];

NSLog(@"下载工具中打印格式%@",format);
_fileForm = format;
NSString *fileSavePath = [self getFileSavePathWithURL:url andFormat:format];
if ([fileMan fileExistsAtPath:fileSavePath]) {
    NSLog(@"文件已经存在");
    if (completeBlock) {
        completeBlock(fileSavePath, nil);
    }
    return;
}

if ([self isDownloadingAudioWithURL:url]) {
    NSLog(@"正在下载");
    return;
}

[_progressBlocks setObject:progressBlock forKey:url];
[_completeBlocks setObject:completeBlock forKey:url];

NSString *resumeDataPath = [self getResumeDataPathWithURL:url andFormat:format];

NSURLSessionDownloadTask *downloadTask;
if ([fileMan fileExistsAtPath:resumeDataPath]) {

    NSData *resumeData = [NSData dataWithContentsOfFile:resumeDataPath];
    downloadTask = [self.session downloadTaskWithResumeData:resumeData];
} else {
    downloadTask = [self.session downloadTaskWithURL:url];
}

[_downloadTasks setObject:downloadTask forKey:url];
//开启
[downloadTask resume];

}

-(NSString *)getResumeDataPathWithURL:(NSURL *)url andFormat:(NSString *)format{
NSString *tmpPath = NSTemporaryDirectory();

NSString *fileName = [NSString stringWithFormat:@"%@%@",[url.absoluteString md5String],format];
return [tmpPath stringByAppendingPathComponent:fileName];

}

-(NSString *)getFileSavePathWithURL:(NSURL *)url andFormat:(NSString *)format{

NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];

NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *TZHCachePath = [cachePath stringByAppendingPathComponent:@"TZHDownloadFile"];
[fileManager createDirectoryAtPath:TZHCachePath withIntermediateDirectories:YES attributes:nil error:nil];

NSString *fileName = [NSString stringWithFormat:@"%@%@",[url.absoluteString md5String],format];
_fileName = fileName;
return [TZHCachePath stringByAppendingPathComponent:fileName];
}

// sessionDelegate 代理方法

-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location {

NSFileManager *fileMan = [NSFileManager defaultManager];

NSURL *currentURL = downloadTask.currentRequest.URL;
[fileMan copyItemAtPath:location.path toPath:[self getFileSavePathWithURL:currentURL andFormat:_fileForm] error:NULL];

if (_completeBlocks[currentURL]) {
    void (^tmpCompBlock)(NSString *filePath, NSError *error) = _completeBlocks[currentURL];
    tmpCompBlock([self getFileSavePathWithURL:currentURL andFormat:_fileForm], nil);
}

_progressBlocks[currentURL] = nil;
_completeBlocks[currentURL] = nil;
_downloadTasks[currentURL] = nil;

}

-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite {

float progress = totalBytesWritten * 1.0 / totalBytesExpectedToWrite;

NSURL *url = downloadTask.currentRequest.URL;
if (_progressBlocks[url]) {

   void (^tmpProBlock)(float) = _progressBlocks[url];
   tmpProBlock(progress);
}

}

+(NSString *)getFileCacheSize{

NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];

NSString *TZHCachePath = [cachePath stringByAppendingPathComponent:@"TZHDownloadFile"];

NSArray *subPathArr = [[NSFileManager defaultManager] subpathsAtPath:TZHCachePath];

NSString *filePath  = nil;
NSInteger totleSize = 0;

for (NSString *subPath in subPathArr){

    filePath =[TZHCachePath stringByAppendingPathComponent:subPath];

    BOOL isDirectory = NO;

    BOOL isExist = [[NSFileManager defaultManager] fileExistsAtPath:filePath isDirectory:&isDirectory];

    if (!isExist || isDirectory || [filePath containsString:@".DS"]){

        continue;
    }
    
    NSDictionary *dict = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:nil];

    NSInteger size = [dict[@"NSFileSize"] integerValue];

    totleSize += size;
}

NSString *totleStr = nil;

if (totleSize > 1000 * 1000){
    totleStr = [NSString stringWithFormat:@"%.2fM",totleSize / 1000.00f /1000.00f];

}else if (totleSize > 1000){
    totleStr = [NSString stringWithFormat:@"%.2fKB",totleSize / 1000.00f ];

}else{
   totleStr = [NSString stringWithFormat:@"%.2fB",totleSize / 1.00f];
}

return totleStr;

}

+(void)deleteFileFromCache{

NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
NSString *TZHCachePath = [cachePath stringByAppendingPathComponent:@"TZHDownloadFile"];

NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *array = [fileManager contentsOfDirectoryAtPath:TZHCachePath error:nil];

for(NSString *fileName in array){

    [fileManager removeItemAtPath:[TZHCachePath stringByAppendingPathComponent:fileName] error:nil];
}

}
@end

下载的管理类写好之后 只需要在需要调用的地方调用相应的接口方法就可以了,

//异步下载的方法 进度的block
-(void)downloadAudioWithURL:(NSURL *)url andFormat:(NSString *)format progress:(void(^)(float progress))progressBlock complete:(void(^)(NSString *fileSavePath,NSError *error))completeBlock;

//判断是否正在下载
-(BOOL)isDownloadingAudioWithURL:(NSURL *)url;

//取消下载

  • (void)cancelDownloadingAudioWithURL:(NSURL *)url andFormat:(NSString *)format complete:(void (^)())completeBlock;

//显示文件占内存大小

  • (NSString *)getFileCacheSize;
    //删除文件

+(void)deleteFileFromCache;

实现了下载功能之后,需要做的就是如何把下载在本地沙盒文件给显示出来了,楼主试过很多方法 有苹果自备的api 但是都不好用,最后使用UIWebView来实现的,这个在之前的文章里已经说过了实现原理了 有兴趣的老铁可以点击底下的这个链接,查看实现的详细过程

http://www.jianshu.com/p/ee96475018ee

以下po出最终的实现效果:

动图.gif

之前在github上没有找到合适的框架,所以自己封装了一个文件下载与查看的框架 放到了github上供大家下载,有详细的demo 使用直接把TZHFileManager 拖进项目的资源路径下即可,集成也相当简单,只需要两步,demo里已做了详细的说明,有兴趣的老铁可以下载下来看看,欢迎给我提建议 QQ:734754688

github地址: https://github.com/TZHui/TZHFileManager

原创不易啊 !觉得好用 喜欢的话记得给我打星呀 😁

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