iOS-显示获取缓存的大小的方法和清除缓存方法

获取缓存的方法：

- (float)filePath {
    
    NSString * cachPath = [ NSSearchPathForDirectoriesInDomains ( NSCachesDirectory , NSUserDomainMask , YES ) firstObject ];
    return [ self folderSizeAtPath:cachPath];
}

//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];
        
    }
    
    //SDWebImage框架自身计算缓存的实现
    folderSize += [[SDImageCache sharedImageCache] getSize];
    
    return folderSize/(1024.0*1024.0);
    
}

- (long long) fileSizeAtPath:(NSString*) filePath{
    
    NSFileManager* manager = [NSFileManager defaultManager];
    
    if ([manager fileExistsAtPath:filePath]){
        
        return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
        
    }
    
    return 0;
    
}

清除缓存的方法：

- (void)clearCacheDidSelected {
    
    WEAK(weakSelf)
    
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:SF(@"缓存大小为%@,确定要清理缓存吗？",self.cacheStr) preferredStyle:UIAlertControllerStyleAlert];
    
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
    UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
        weakSelf.cacheStr = @"0.00M";
        [weakSelf.sourceArr removeObjectAtIndex:1];
        [weakSelf.sourceArr insertObject:weakSelf.cacheStr atIndex:1];
        [weakSelf.tableView reloadData];
        [weakSelf clearCache];
        
        
    }];
    
    [alertController addAction:cancelAction];
    [alertController addAction:confirmAction];
    
    [self presentViewController:alertController animated:YES completion:nil];
}

- (void)clearCache {
    
    NSString * cachPath = [ NSSearchPathForDirectoriesInDomains ( NSCachesDirectory , NSUserDomainMask , YES ) firstObject ];
    
    NSFileManager *fileManager=[NSFileManager defaultManager];
    
    if ([fileManager fileExistsAtPath:cachPath]) {
        
        NSArray *childerFiles=[fileManager subpathsAtPath:cachPath];
        
        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=[cachPath stringByAppendingPathComponent:fileName];
            [fileManager removeItemAtPath:absolutePath error:nil];
        }
    }
    
    [[SDImageCache sharedImageCache] clearMemory];
}

方法的调用：
//获取缓存的
NSString *cacheStr = [NSString stringWithFormat:@"%.2fM",[self filePath]];
//清除缓存
[self clearCacheDidSelected];

pch