Swift

一：加密（PBKDF2 , AES）

1，[UInt8]  : 

      将Data数据转换为[UInt8]（bytes字节数组）

//获取安全随机数

    static func getRandomSalt(length: Int) -> (Data, OSStatus){

        var data = Data(count: length)

        var local = data

        let result = local.withUnsafeMutableBytes { mutableBytes in

            SecRandomCopyBytes(kSecRandomDefault, data.count, mutableBytes)

        }

// (数据，结果)

        return (local,result)

    }

// Data -> [UInt8] 将Data数据转换为[UInt8]（bytes字节数组）

        let ivbytes = local.withUnsafeBytes {

            [UInt8](UnsafeBufferPointer(start: $0, count: local.count))

        }

 二 ，闭包使用

1，作网络请求参数：

/** POST NSDictionary-result */
    static func POST_DICT(urlStr:String,paramDic:NSDictionary?,headerDic:[String:String]? ,success:@escaping ((_ result:NSDictionary)->()) ,failure:@escaping ((_ err : NSError) -> ())){
        
        // Lute : 1234567890 https://cloudbackup.hwcloudtest.cn:18443/servicesupport/updateserver/data/COTA?ParamId=BTFCM530
//        let urlStr = "https://cloudbackup.hwcloudtest.cn:18443/servicesupport/updateserver/data/COTA?ParamId=BTFCM530"
        let url = NSURL.init(string: urlStr)
        let request : NSMutableURLRequest  = NSMutableURLRequest.init(url: url! as URL)
        request.httpMethod = "POST"
        // Header
        // > 字典形式统一设置Header
//        request.allHTTPHeaderFields = headerDic
        // > 逐条设置Header
//        request.setValue("1234567890", forHTTPHeaderField:"Device-ID")
        
        let session: URLSession = URLSession.shared
        let dataTask: URLSessionDataTask = session.dataTask(with: request as URLRequest) { (data, response, error) in
            
            if(error == nil){
                // 解析数据
                //（此处返回的数据是JSON格式的，因此使用NSJSONSerialization进行反序列化处理）
                var dict:NSDictionary? = nil
                do {
                    dict  = try (((JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.init(rawValue: 0)) as? NSDictionary)))
                } catch let err as NSError {
                    LogUtils.print(err)
                }
                LogUtils.print("session === %@",dict as Any)
                if dict != nil {
                    success(dict!)
                }else {
                    ToastUtils.show("版本检查异常")
                    let err = NSError.init(domain: "网络请求数据解析异常！", code: 10000, userInfo: nil)
                    failure(err as NSError)
                }                
            }else {
                ToastUtils.show("网络请求异常")
                failure(error! as NSError)
            }
        }
        // 执行任务
        dataTask.resume()
    }

 二 ， 属性变量参数

var selectedCallBack: ((_ selectPeripheral: CBPeripheral) -> ())?

convenience init(cancelCallBack: (() -> ())?, selectedCallBack: ((_ selectPeripheral: CBPeripheral) -> ())?) {
        self.init(frame: CGRect(x: 0 , y: 0,  UIScreen.main.bounds.width , height: UIScreen.main.bounds.height))
        addSubview(coverView)
        self.cancelCallBack = cancelCallBack
        self.selectedCallBack = selectedCallBack
        self.tableView.delegate = self
        self.tableView.dataSource = self
        tableView.tableFooterView = UIView(frame: CGRect(x: 0, y: 0,  0, height: 0.1))
    }

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        defer {
            tableView.deselectRow(at: indexPath, animated: true)
        }
        let device = dataSource[indexPath.row]
        if selectedCallBack != nil {
            selectedCallBack!(device)
        }
        dismiss()
    }

三， APPStore版本更新.

// 检查版本更新
    func checkAppVersion(){
        
        NetUtil.POST_DICT(urlStr: "http://itunes.apple.com/cn/lookup?id=1438415183", paramDic: nil, headerDic: nil, success: { (result) in
                let version = ((result["results"] as! NSArray)[0] as! NSDictionary).object(forKey: "version")
                LogUtils.print("APPStore version =",version!)
                let localVersion = (Bundle.main.infoDictionary! as NSDictionary)["CFBundleShortVersionString"] as! NSString
                LogUtils.print(localVersion)
                let result = localVersion.compare(version as! String, options: .numeric)
                if result == ComparisonResult.orderedAscending {
//                  localVersion  smaller
                    LogUtils.print("APPStore get a new Version!")
                    UserDefaults.standard.set(true, forKey: Const.APPSTORE_NEW_VERSION)
                }else {
                    UserDefaults.standard.set(false, forKey: Const.APPSTORE_NEW_VERSION)
            }
        }, failure: { (error) in
            LogUtils.print("NetUtil Post err =",error)
        })
    }

四， 多Target ,马甲开发。

     ========= 判断该控制器是否正在显示=======

 

+(BOOL)isCurrentViewControllerVisible:(UIViewController *)viewController
{
    return (viewController.isViewLoaded && viewController.view.window);
}

也可以将该方法定义在UIViewController的分类中, 方便多处调用

假如一个UIView对象当前正在显示，那么它的window属性肯定为非空值。

虽然官方文档未说明UIView未显示时window属性的取值，但是经过简单的测试，大部分情况下UIView未显示时，

window的值为空，因此依据此判断当前UIViewController是否正在显示。但是访问UIViewController的view属性时，

可能会引起view加载(假如此时还未加载)，这是不必要的，而且还可能引起无法预期的问题。因此在访问view属性之前，最好先检查isViewLoaded属性来避免上述问题。

六， 蓝牙 BLE

1，APP打开了蓝牙权限时，系统蓝牙打开提示框   是否开启key  : CBCentralManagerOptionShowPowerAlertKey