iOS开发网络篇之TZHFileManager使用介绍,文件附件

作者: 少年你这是喜脉啊 | 来源:发表于2017-06-30 14:53 被阅读0次

iOS开发网络篇之TZHFileManager使用介绍,文件附件
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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 😁