验证方法：

1.从网络下载文件资源

2.将Zip 资源解压到Documents

3.将数据归档，并解档

 

NSString *filename = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];

 NSString *path = [filename stringByAppendingPathComponent:@"123"];   

 UIImageView *imgview = [[UIImageView alloc] initWithImage:[UIImage imageWithContentsOfFile:path]];