iOS 清除APP本地缓存

场景：最近项目需求迭代，需要加一个清除APP缓存的入口

缓存文件大小的获取（Swift5.0版本）：

/// 获取缓存大小
class func getCacheSize() -> Double {
        
        /// 本地沙盒目录下的缓存
        // 取出cache文件夹目录
        guard let cachePath = NSSearchPathForDirectoriesInDomains(.cachesDirectory, .userDomainMask, true).first else {
            return 0
        }

        // 取出文件夹下所有文件数组
        let fileArr = FileManager.default.subpaths(atPath: cachePath) ?? []
        
        guard fileArr.count > 0 else {
            return 0
        }
        
        //快速枚举出所有文件名 计算文件大小
        var size = 0
        for file in fileArr {
            
            // 把文件名拼接到路径中
            let path = cachePath + ("/\(file)")
            // 取出文件属性
            if let floder = try? FileManager.default.attributesOfItem(atPath: path) {
                // 用元组取出文件大小属性
                for (key, fileSize) in floder {
                    // 累加文件大小
                    if key == FileAttributeKey.size {
                        size += (fileSize as AnyObject).integerValue
                    }
                }
            }
        }
        
        let totalCache = Double(size) / 1024.00 / 1024.00
        return totalCache
}

清除缓存：

    /// 清除缓存
    class func clearCache(with completion: ((Double)->())?) {
        HUD.show()
        // 取出cache文件夹目录
        if let cachePath = NSSearchPathForDirectoriesInDomains(.cachesDirectory, .userDomainMask, true).first {
            let fileArr = FileManager.default.subpaths(atPath: cachePath) ?? []
            guard fileArr.count > 0 else {
                HUD.dismiss()
                completion?(0)
                return
            }
            // 遍历删除
            for file in fileArr {
                let path = (cachePath as NSString).appending("/\(file)")
                if FileManager.default.fileExists(atPath: path) {
                    do {
                        try FileManager.default.removeItem(atPath: path)
                    } catch {
                    }
                }
            }
            HUD.dismiss()
            let DoubleSize = CacheManager.getCacheSize()
            completion?(DoubleSize)
        } else {
            HUD.dismiss()
            completion?(0)
        }
    }