swift 获取缓存和删除缓存功能

swift 获取和删除缓存的功能，其实就是String的扩展功能使用如下的两个方法就可以实现

获取缓存和删除缓存的方法

在String中写入扩展

// 获取缓存
static func getCacheSize() -> String {
        let cachePath = NSSearchPathForDirectoriesInDomains(.cachesDirectory, .userDomainMask, true).first
        let fileArr = FileManager.default.subpaths(atPath: cachePath!)
        var size = 0
        for file in fileArr! {
            let path = cachePath! + "/\(file)"
            let floder = try! FileManager.default.attributesOfItem(atPath: path)
            for (key, fileSize) in floder {
                if key == FileAttributeKey.size {
                    size += (fileSize as AnyObject).integerValue
                }
                
            }
        }
        let totalCache = Double(size) / 1024.00 / 1024.00
        return String(format: "%.2f", totalCache)
    }
//删除缓存
    static func clearCache() {
        let cachePath = NSSearchPathForDirectoriesInDomains(.cachesDirectory, .userDomainMask, true).first
        let fileArr = FileManager.default.subpaths(atPath: cachePath!)
        for file in fileArr! {
            let path = cachePath! + "/\(file)"
            if FileManager.default.fileExists(atPath: path) {
                do {
                    try FileManager.default.removeItem(atPath: path)
                }catch {
                    
                }
            }
        }
    }