iOS实现启动引导页与指纹解锁的方法详解

#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;
}

//
// 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

//
// 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