仿ios支付宝解锁功能（一）

指纹解锁

创建项目，Fingerlock，使用xcode7.3，开发语言swift。

创建一个运行如下的项目，运行如下：

在thirditem的界面添加安全设置按钮，点击进入安全设置列表，如图：

  

现在分析指纹解锁：

指纹解锁机制： 调用手机端录入指纹，使用home键验证用户指纹是否正确

代码：

import LocalAuthentication let context = LAContext() if #available(iOS 9.0, *) { context.evaluatePolicy(LAPolicy.DeviceOwnerAuthentication, localizedReason: "通过Home键验证已有手机指纹") { (sucess, authentcationError) in if sucess == true { //解锁成功 }else { //解锁失败 } } } else { print("failed") // Fallback on earlier versions }判断手机是否支持指纹解锁： let ctx = LAContext() if ctx.canEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, error: nil) == false{ //手机不支持指纹解锁 }需要指纹解锁，还需用到数据存储，我这里简单使用NSUserDefaults来处理数据，代码：

建立Userinfo的类：

//设置指纹解锁 func setLockWithFingerPrintOn(isOn: Bool) -> Bool { let userDefaults = NSUserDefaults.standardUserDefaults() let device : String = UIDevice.currentDevice().systemVersion let dou:Double = (device as NSString).doubleValue var newIsOn = isOn if dou <= 8 { newIsOn = false } let ctx = LAContext() if ctx.canEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, error: nil) == false{ newIsOn = false } userDefaults.setBool(newIsOn, forKey: "fingerPrint") userDefaults.synchronize() return newIsOn } //读取指纹是否解锁 func isLockWithfingerPrint() -> Bool { let device : String = UIDevice.currentDevice().systemVersion let dou:Double = (device as NSString).doubleValue if dou <= 8 { return false } let ctx = LAContext() if ctx.canEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, error: nil) == false{ return false } let userDefaults = NSUserDefaults.standardUserDefaults() if userDefaults.objectForKey("fingerPrint") == nil { userDefaults.setBool(false, forKey: "fingerPrint") userDefaults.synchronize() return false }else{ //开启指纹解锁功能 return userDefaults.boolForKey("fingerPrint") } } 在Fingersettingcell的代码： import UIKit class FingersettingCell: UITableViewCell { typealias SwitchChose = (UISwitch) -> () var choseclickwithswitch : SwitchChose? @IBOutlet weak var title: UILabel! @IBOutlet weak var issetting: UISwitch! override func awakeFromNib() { super.awakeFromNib() // Initialization code } func cellForModel(model : FingersettingModel) -> () { title.text = model.title issetting.on = model.isok } @IBAction func clickchose(sender: UISwitch) { if choseclickwithswitch != nil { choseclickwithswitch!(sender) } } override func setSelected(selected: Bool, animated: Bool) { super.setSelected(selected, animated: animated) // Configure the view for the selected state } } 在FingersettingController的代码：

import UIKit import LocalAuthentication class FingersettingController: UITableViewController { let dataarray : [FingersettingModel] = { let m1 = FingersettingModel.init(dict: [:]) m1.title = "指纹解锁" m1.isok = UserInfo.isLockWithfingerPrint() let m2 = FingersettingModel.init(dict: [:]) m2.title = "支付解锁" return [m1,m2] }() override func viewDidLoad() { super.viewDidLoad() self.tableView.registerNib(UINib.init(nibName: "FingersettingCell", bundle: NSBundle.mainBundle()), forCellReuseIdentifier: "FingersettingCellID") } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } // MARK: - Table view data source override func numberOfSectionsInTableView(tableView: UITableView) -> Int { return 1 } override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return dataarray.count } override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCellWithIdentifier("FingersettingCellID", forIndexPath: indexPath) as! FingersettingCell switch indexPath.row { case 0: cell.choseclickwithswitch = { swit in let isOn = UserInfo.setLockWithFingerPrintOn(swit.on) swit.on = isOn //不支持指纹解锁 if swit.on == true && isOn == false { print("手机不支持指纹功能或是您未设置指纹") return } //当手势解锁是开启状态时 if swit.on { //开启验证解锁 添加验证解锁代码 let context = LAContext() // var msg = "" if #available(iOS 9.0, *) { context.evaluatePolicy(LAPolicy.DeviceOwnerAuthentication, localizedReason: "通过Home键验证已有手机指纹") { (sucess, authentcationError) in if sucess == true { UserInfo.setLockWithFingerPrintOn(true) }else { UserInfo.setLockWithFingerPrintOn(false) } } } else { UserInfo.setLockWithFingerPrintOn(false) } } } break case 1: break default: break } cell.cellForModel(dataarray[indexPath.row]) return cell } }