iOS清除缓存的方法

//获取所有缓存大小
- (double)getCachesSize {
    //1.自定义的缓存 2.sd 的缓存
    NSUInteger sdFileSize = [[SDImageCache sharedImageCache] getSize];
    
    //先获取 系统 Library/Caches 路径
    NSString *caches = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] ;
    NSString *myCachesPath = [caches stringByAppendingPathComponent:@"LWXCarsCaches"];
    //遍历 自定义缓存文件夹
    //目录枚举器 ，里面存放着  文件夹中的所有文件名
    NSDirectoryEnumerator *enumrator = [[NSFileManager defaultManager] enumeratorAtPath:myCachesPath];
    
    NSUInteger mySize = 0;
    //遍历枚举器
    for (NSString *fileName in enumrator) {
        //文件路径
        NSString *filePath = [myCachesPath stringByAppendingPathComponent:fileName];
        NSDictionary *fileDict = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:nil];
        //获取大小
        mySize += fileDict.fileSize;//字节大小
    }
    //1M == 1024KB == 1024*1024bytes
    return (mySize+sdFileSize)/1024.0/1024.0;
}

//点击 操作表单的按钮
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
    if (buttonIndex == actionSheet.destructiveButtonIndex) {
        //删除
        //1.删除sd
        [[SDImageCache sharedImageCache] clearMemory];//清除内存缓存
        //2.清除 磁盘缓存
        [[SDImageCache sharedImageCache] clearDisk];
        
        //清除自己的缓存
        NSString *caches = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] ;
        NSString *myCachesPath = [caches stringByAppendingPathComponent:@"LWXCarsCaches"];
        //删除
        [[NSFileManager defaultManager] removeItemAtPath:myCachesPath error:nil];
        
    }
}
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- (IBAction)clearBtn:(id)sender {
     //清理缓存...
    UIAlertController *sheet = [UIAlertController alertControllerWithTitle:@"清除缓存" message:[NSString stringWithFormat:@"总共有%.5fM缓存",[self getCacheSize]] preferredStyle:UIAlertControllerStyleActionSheet];
    __weak typeof(self)weakSelf = self;
    [sheet addAction:[UIAlertAction actionWithTitle:@"删除" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action)
    {
    [[SDImageCache sharedImageCache] clearMemory];
    [[SDImageCache sharedImageCache] clearDisk];
    //
    NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches/MyCaches"];
    [[NSFileManager defaultManager] removeItemAtPath:myCachePath error:nil];
     self.dataLab.text = [NSString stringWithFormat:@"%.5fM",[weakSelf getCacheSize]];
    }]];
    [self presentViewController:sheet animated:YES completion:nil];
    //NSLog(@"%@",[NSString stringWithFormat:@"%.5fM",[self getCacheSize]]);
    //stringWithFormat:@"%dM", 0];
}

#pragma mark - 计算缓存大小

- (CGFloat)getCacheSize {
    NSUInteger imageCacheSize = [[SDImageCache sharedImageCache]  getSize];
    NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches/MyCaches"];
    NSDirectoryEnumerator *enumerator = [[NSFileManager defaultManager] enumeratorAtPath:myCachePath];
    __block NSUInteger count = 0;
    for (NSString *fileName in enumerator) {
        NSString *path = [myCachePath stringByAppendingPathComponent:fileName];
    NSDictionary *fileDict = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];
        count += fileDict.fileSize;
    }
    CGFloat totalSize = ((CGFloat)imageCacheSize+count)/1024/1024;
    return totalSize; //返回M
}
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-(void)clearCache{
    dispatch_async(
                   dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                       NSString *cachPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES) objectAtIndex:0];
                       NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:cachPath];
                       NSLog(@"files :%ld",[files count]); // 文件夹的数量
                       for (NSString *p in files) {
                           NSError *error;
                           NSString *path1 = [cachPath stringByAppendingPathComponent:p];
                           if ([[NSFileManager defaultManager] fileExistsAtPath:path1]) {
                               [[NSFileManager defaultManager] removeItemAtPath:path1 error:&error];
                           }
                       }
                   });
}