iOS实现启动引导页与指纹解锁的方法详解
前言
应用程序启动时有些会有引导页,目的是用户第一次登录时对应用程序的一些简单了解介绍,一般就是几张轮播图片,当引用程序第一次进入时会跳到引导页,以后不再显示,这时就需要将不是第一次登录的标致flag保存到内存中,推荐用户偏好设置NSUserDefaults,第一直接去取值取这个flag取不到(因为是第一次登录)就跳引导页,然后在引导页进入登录页或者首页时将flag值保存到偏好设置中,以后再进来就可以取到不是第一登录的flag就直接跳过引导页.方式有两种:一种是直接切换UIWindow的根控制器本文是第一种,另一种是模态弹出,根据具体需求决定!
效果图:
引导页及指纹识别效果图1
引导页及指纹识别效果图2
以下直接上代码:
AppDelegate文件中
#import "AppDelegate.h" #import "GuidePagesViewController.h" #import "LoginViewController.h" @interface AppDelegate () @end @implementation AppDelegate - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds]; self.window.backgroundColor = [UIColor whiteColor]; NSUserDefaults * userDefault = [NSUserDefaults standardUserDefaults]; if (![userDefault boolForKey:@"isNotFirst"]) {//如果用户是第一次登录 self.window.rootViewController = [[GuidePagesViewController alloc]init]; }else{//否则直接进入登录页面 self.window.rootViewController = [[LoginViewController alloc]init]; } [self.window makeKeyAndVisible]; return YES; }
引导页控制器:GuidePagesViewController
// // GuidePagesViewController.m // 登录引导页开发 // // Created by hj on 2018/1/31. // Copyright © 2018年 hj. All rights reserved. // #import "GuidePagesViewController.h" #import "LoginViewController.h" #define ScreenWidth [UIScreen mainScreen].bounds.size.width #define ScreenHeight [UIScreen mainScreen].bounds.size.height @interface GuidePagesViewController ()<UIScrollViewDelegate> @property(nonatomic ,strong) UIScrollView * mainScrollV; @property(nonatomic ,strong) UIPageControl * pageControl; @property(nonatomic ,strong) NSMutableArray * images; @end @implementation GuidePagesViewController - (void)viewDidLoad { [super viewDidLoad]; [self.view addSubview:self.mainScrollV]; [self.view addSubview:self.pageControl]; } -(UIScrollView *)mainScrollV{ if (!_mainScrollV) { _mainScrollV = [[UIScrollView alloc]initWithFrame:self.view.bounds]; _mainScrollV.bounces = NO; _mainScrollV.pagingEnabled = YES; _mainScrollV.showsHorizontalScrollIndicator = NO; _mainScrollV.delegate = self; _mainScrollV.contentSize = CGSizeMake(self.images.count * ScreenWidth, ScreenHeight); [self addSubImageViews]; } return _mainScrollV; } -(NSMutableArray *)images{ if (!_images) { _images = [NSMutableArray array]; NSArray * imageNames = @[@"u1",@"u2",@"u3",@"u4"]; for (NSString * name in imageNames) { [self.images addObject:[UIImage imageNamed:name]]; } } return _images; } - (void)addSubImageViews{ for (int i = 0; i < self.images.count; i++) { UIImageView * imageV = [[UIImageView alloc]initWithFrame:CGRectMake(i * ScreenWidth, 0, ScreenWidth, ScreenHeight)]; imageV.image = self.images[i]; [_mainScrollV addSubview:imageV]; if (i == self.images.count - 1){//最后一张图片时添加点击进入按钮 imageV.userInteractionEnabled = YES; UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom]; btn.frame = CGRectMake(ScreenWidth * 0.5 - 80, ScreenHeight * 0.7, 160, 40); [btn setTitle:@"点击一下,你就知道" forState:UIControlStateNormal]; [btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; btn.backgroundColor = [UIColor redColor]; btn.layer.cornerRadius = 20; btn.layer.borderWidth = 1; btn.layer.borderColor = [UIColor redColor].CGColor; [btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside]; [imageV addSubview:btn]; } } } //点击按钮保存第一次登录的标记到本地并且跳入登录界面 - (void)btnClick{ //保存标记到本地 NSUserDefaults * userDef = [NSUserDefaults standardUserDefaults]; [userDef setBool:YES forKey:@"isNotFirst"]; [userDef synchronize]; //切换视图控制器 [UIApplication sharedApplication].keyWindow.rootViewController = [[LoginViewController alloc]init]; } -(UIPageControl *)pageControl{ if (!_pageControl) { _pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(ScreenWidth/self.images.count, ScreenHeight * 15/16.0, ScreenWidth/2, ScreenHeight/16.0)]; //设置总页数 _pageControl.numberOfPages = self.images.count; //设置分页指示器颜色 _pageControl.pageIndicatorTintColor = [UIColor blueColor]; //设置当前指示器颜色 _pageControl.currentPageIndicatorTintColor = [UIColor redColor]; _pageControl.enabled = NO; } return _pageControl; } #pragma mark UIScrollViewDelegate -(void)scrollViewDidScroll:(UIScrollView *)scrollView{ self.pageControl.currentPage = (NSInteger)self.mainScrollV.contentOffset.x/ScreenWidth; } @end
指纹解锁很简单,导入头文件#import "LocalAuthentication/LocalAuthentication.h",验证手机系统是否支持指纹解锁 iOS 8以后才行,验证本手机是否开启了指纹识别,是否录入了指纹等
指纹登录验证:LoginViewController
// // LoginViewController.m // 指纹验证 // // Created by hj on 2018/1/31. // Copyright © 2018年 hj. All rights reserved. // #import "LoginViewController.h" #import "LocalAuthentication/LocalAuthentication.h" @interface LoginViewController () @end @implementation LoginViewController - (void)viewDidLoad { [super viewDidLoad]; if ([UIDevice currentDevice].systemVersion.floatValue < 8.0) {//8.0以后才支持指纹 return; } UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom]; btn.frame = CGRectMake(0, 0, 160, 50); btn.center = self.view.center; [btn setTitle:@"点击一下,指纹登录" forState:0]; [btn setTitleColor:[UIColor redColor] forState:0]; btn.backgroundColor = [UIColor yellowColor]; btn.layer.borderColor = [UIColor orangeColor].CGColor; btn.layer.borderWidth = 2; btn.layer.cornerRadius = 20; [btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:btn]; } - (void)btnClick{ [self fingerprintVerification]; } - (void)fingerprintVerification { //创建LAContext LAContext* context = [[LAContext alloc] init]; NSError* error = nil; if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) { //支持指纹验证 [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"请验证已有指纹" reply:^(BOOL success, NSError *error) { if (success) { //验证成功,主线程处理UI NSLog(@"成功啦"); //用户选择输入密码,切换主线程处理 dispatch_async(dispatch_get_main_queue(), ^{ [self showMessage:@"指纹登录成功!"]; }); } else { NSLog(@"%@",error.localizedDescription); switch (error.code) { case LAErrorSystemCancel: { [self showMessage:@"系统取消授权,如其他APP切入"]; //系统取消授权,如其他APP切入 break; } case LAErrorUserCancel: { //用户取消验证Touch ID [self showMessage:@"用户取消验证Touch ID"]; break; } case LAErrorAuthenticationFailed: { //授权失败 [self showMessage:@"授权失败"]; break; } case LAErrorPasscodeNotSet: { //系统未设置密码 [self showMessage:@"系统未设置密码"]; break; } case LAErrorBiometryNotAvailable: { //设备Touch ID不可用,例如未打开 [self showMessage:@"设备Touch ID不可用,例如未打开"]; break; } case LAErrorBiometryNotEnrolled: { //设备Touch ID不可用,用户未录入 [self showMessage:@"设备Touch ID不可用,用户未录入"]; break; } case LAErrorUserFallback: { [[NSOperationQueue mainQueue] addOperationWithBlock:^{ //用户选择输入密码,切换主线程处理 [self showMessage:@"用户选择输入密码,切换主线程处理"]; }]; break; } default: { [[NSOperationQueue mainQueue] addOperationWithBlock:^{ //其他情况,切换主线程处理 [self showMessage:@"其他情况,切换主线程处理"]; }]; break; } } } }]; } else { //不支持指纹识别,LOG出错误详情 NSLog(@"不支持指纹识别"); switch (error.code) { case LAErrorBiometryNotEnrolled: { NSLog(@"TouchID is not enrolled"); [self showMessage:@"TouchID is not enrolled"]; break; } case LAErrorPasscodeNotSet: { NSLog(@"A passcode has not been set"); [self showMessage:@"A passcode has not been set"]; break; } default: { NSLog(@"TouchID not available"); [self showMessage:@"TouchID not available"]; break; } } NSLog(@"error : %@",error.localizedDescription); } } -(void)showMessage:(NSString *)msg{ UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"提示" message:msg delegate:nil cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil]; [alert show]; } @end
总结
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