IOS下载资源zip到本地然后读取

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思路是

1.ios下载服务器上的zip资源包（图片，声音等经过zip压缩的资源包）到本地

2.解压zip到程序目录

3.从程序目录加载资源文件

一、下载zip资源

-(NSString*)DownloadTextFile:(NSString*)fileUrl   fileName:(NSString*)_fileName
{
    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask,YES);//使用C函数NSSearchPathForDirectoriesInDomains来获得沙盒中目录的全路径。
    NSString *ourDocumentPath =[documentPaths objectAtIndex:0];
    NSString *sandboxPath = NSHomeDirectory();
    NSString *documentPath = [sandboxPath  stringByAppendingPathComponent:@"TestDownImgZip.app"];//将Documents添加到sandbox路径上//TestDownImgZip.app
    NSString *FileName=[documentPath stringByAppendingPathComponent:_fileName];//fileName就是保存文件的文件名
    NSFileManager *fileManager = [NSFileManager defaultManager];
    // Copy the database sql file from the resourcepath to the documentpath
    if ([fileManager fileExistsAtPath:FileName])
    {
        return FileName;
    }else
    {
        NSURL *url = [NSURL URLWithString:fileUrl];
        NSData *data = [NSData dataWithContentsOfURL:url];
        [data writeToFile:FileName atomically:YES];//将NSData类型对象data写入文件，文件名为FileName
    }
    return FileName;
}

2.解压zip包

- (void)OpenZip:(NSString*)zipPath  unzipto:(NSString*)_unzipto
{
    ZipArchive* zip = [[ZipArchive alloc] init];
    if( [zip UnzipOpenFile:zipPath] )
    {
        BOOL ret = [zip UnzipFileTo:_unzipto overWrite:YES];
        if( NO==ret )
        {
            NSLog(@"error");
        }
        [zip UnzipCloseFile];
    }
    [zip release];
    
}

3.调去函数

- (IBAction)ShowImg:(id)sender {
    NSString *filePath = [self DownloadTextFile:@"http://www.xtox.net/img.zip" fileName:@"img.zip"];
    NSLog(filePath);
    
    NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask,YES);//使用C函数NSSearchPathForDirectoriesInDomains来获得沙盒中目录的全路径。
    NSString *ourDocumentPath =[documentPaths objectAtIndex:0];
    NSString *sandboxPath = NSHomeDirectory();
    NSString *documentPath = [sandboxPath  stringByAppendingPathComponent:@"TestDownImgZip.app"];//将Documents添加到sandbox路径上//TestDownImgZip.app

    [self OpenZip:filePath unzipto:documentPath];
    self.imgView.image = [UIImage imageNamed:@"img/1.png"];
}