不积跬步,无以至千里
不积小流,无以成江海

具体目录参考iOS-沙盒机制存放文件

• 计算单个文件的�大小

-(float)fileSizeAtPath:(NSString *)path{
    NSFileManager *fileManager=[NSFileManager defaultManager];
    if([fileManager fileExistsAtPath:path]){
        long long size=[fileManager attributesOfItemAtPath:path error:nil].fileSize;
        return size/1024.0/1024.0;
    }
    return 0;
}

• 目录文件的大小

-(float)folderSizeAtPath:(NSString *)path{
    NSFileManager *fileManager=[NSFileManager defaultManager];
    float folderSize;
    if ([fileManager fileExistsAtPath:path]) {
        NSArray *childerFiles=[fileManager subpathsAtPath:path];
        for (NSString *fileName in childerFiles) {
            NSString *absolutePath=[path stringByAppendingPathComponent:fileName];
            folderSize +=[self fileSizeAtPath:absolutePath];
    }
    //SDWebImage框架自身计算缓存的实现
    folderSize+=[[SDImageCache sharedImageCache] getSize]/1024.0/1024.0;
    return folderSize;
    }
    return 0;
}

• 缓存的清理

-(void)clearCache:(NSString *)path{

    //NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
    //NSString *path = [paths lastObject];
  
    NSFileManager *fileManager=[NSFileManager defaultManager];
    if ([fileManager fileExistsAtPath:path]) {
        NSArray *childerFiles=[fileManager subpathsAtPath:path];
        for (NSString *fileName in childerFiles) {
        //删除所有文件
        NSError *error;
        NSString *absolutePath=[path stringByAppendingPathComponent:fileName];
        [fileManager removeItemAtPath:absolutePath error:&error];
        }
    }
    //一般有用到SDWebImage可以用
    //#import "SDImageCache.h"
    [[SDImageCache sharedImageCache] cleanDisk];

}