计算缓存大小和清理缓存

@interface BDFileManagerTool : NSFileManager

/** 计算单个文件大小*/
+ (float)fileSizeAtPath:(NSString *)path;

/** 计算目录大小 */
+(float)folderSizeAtPath:(NSString *)path;

/** 清除缓存*/
+(void)clearCache:(NSString *)path;

@end

#import "BDFileManagerTool.h"
#import "SDWebImageManager.h"


@implementation BDFileManagerTool

/**
 *  计算单个文件的大小
 *
 *  @param path 文件的路径
 *
 *  @return 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;
}

/**
 *  计算目录大小
 *
 *  @param path 目录的路径
 *
 *  @return 目录的大小
 */

+(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 +=[BDFileManagerTool 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;
}

/**
 *  清楚缓存
 *
 *  @param path 缓存的路径
 */
+(void)clearCache:(NSString *)path{
    NSFileManager *fileManager=[NSFileManager defaultManager];
    if ([fileManager fileExistsAtPath:path]) {
        NSArray *childerFiles=[fileManager subpathsAtPath:path];
        for (NSString *fileName in childerFiles) {
            //如有需要，加入条件，过滤掉不想删除的文件
            NSString *absolutePath=[path stringByAppendingPathComponent:fileName];
            [fileManager removeItemAtPath:absolutePath error:nil];
        }
    }
    [[SDImageCache sharedImageCache] clearDisk];
    
    [YZTools toastMake:@"清除缓存成功" isPush:NO];
}

@end

//获取大小
- (void)getFileData {
    CGFloat fileSize = [BDFileManagerTool folderSizeAtPath:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]];
    NSLog(@"fileSize------%.2f",fileSize);
}

//清理缓存
- (void)clearCache {
  [BDFileManagerTool clearCache:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]];  
}