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  • iOS 清理缓存功能的实现第二种方法

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    /**
     *  清理缓存第二种方法
     *
     *  @param sender <#sender description#>
     */
    - (void)clearCache:(id)sender
    {
        //彻底清除缓存第一种方法
        UIButton * button = sender;
        [button setTitle:@"清理完毕" forState:UIControlStateNormal];
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
        NSString *path = [paths lastObject];
         
        NSString *str = [NSString stringWithFormat:@"缓存已清除%.1fM", [self folderSizeAtPath:path]];
        NSLog(@"%@",str);
        NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:path];
        for (NSString *p in files) {
            NSError *error;
            NSString *Path = [path stringByAppendingPathComponent:p];
            if ([[NSFileManager defaultManager] fileExistsAtPath:Path]) {
                [[NSFileManager defaultManager] removeItemAtPath:Path error:&error];
            }
        }
    }
    /**
     *  计算单个文件大小
     */
    - (long long) fileSizeAtPath:(NSString*) filePath{
        NSFileManager* manager = [NSFileManager defaultManager];
        if ([manager fileExistsAtPath:filePath]){
            return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
        }
        return 0;
    }
     
    /**
     *  计算目录大小  遍历文件夹获得文件夹大小,返回多少M
     */
    - (float ) folderSizeAtPath:(NSString*) folderPath{
        NSFileManager* manager = [NSFileManager defaultManager];
        if (![manager fileExistsAtPath:folderPath]) return 0;
        NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];
        NSString* fileName;
        long long folderSize = 0;
        while ((fileName = [childFilesEnumerator nextObject]) != nil){
            NSString* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
            folderSize += [self fileSizeAtPath:fileAbsolutePath];
        }
        return folderSize/(1024.0*1024.0);
    }
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  • 原文地址:https://www.cnblogs.com/bugismyalllife/p/4884308.html
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