iOS實現啟動引導頁與指紋解鎖的方法詳解

發布時間：2020-08-20 13:16:57 來源：腳本之家閱讀：320 作者：Lovely_Juanjuan 欄目：移動開發

前言

應用程序啟動時有些會有引導頁,目的是用戶第一次登錄時對應用程序的一些簡單了解介紹,一般就是幾張輪播圖片,當引用程序第一次進入時會跳到引導頁,以后不再顯示,這時就需要將不是第一次登錄的標致flag保存到內存中,推薦用戶偏好設置NSUserDefaults,第一直接去取值取這個flag取不到(因為是第一次登錄)就跳引導頁,然后在引導頁進入登錄頁或者首頁時將flag值保存到偏好設置中,以后再進來就可以取到不是第一登錄的flag就直接跳過引導頁.方式有兩種:一種是直接切換UIWindow的根控制器本文是第一種,另一種是模態彈出,根據具體需求決定!

效果圖:

引導頁及指紋識別效果圖1

iOS實現啟動引導頁與指紋解鎖的方法詳解

引導頁及指紋識別效果圖2

以下直接上代碼:

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"]) {//如果用戶是第一次登錄
  self.window.rootViewController = [[GuidePagesViewController alloc]init];
 }else{//否則直接進入登錄頁面
  self.window.rootViewController = [[LoginViewController alloc]init];
 }
 [self.window makeKeyAndVisible];
 return YES;
}

引導頁控制器:GuidePagesViewController

//
// GuidePagesViewController.m
// 登錄引導頁開發
//
// 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){//最后一張圖片時添加點擊進入按鈕
   imageV.userInteractionEnabled = YES;
   UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];
   btn.frame = CGRectMake(ScreenWidth * 0.5 - 80, ScreenHeight * 0.7, 160, 40);
   [btn setTitle:@"點擊一下,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];
  }
 }
}
//點擊按鈕保存第一次登錄的標記到本地并且跳入登錄界面
- (void)btnClick{
 //保存標記到本地
 NSUserDefaults * userDef = [NSUserDefaults standardUserDefaults];
 [userDef setBool:YES forKey:@"isNotFirst"];
 [userDef synchronize];
 //切換視圖控制器
 [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)];
  //設置總頁數
  _pageControl.numberOfPages = self.images.count;
  //設置分頁指示器顏色
  _pageControl.pageIndicatorTintColor = [UIColor blueColor];
  //設置當前指示器顏色
  _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

指紋解鎖很簡單,導入頭文件#import "LocalAuthentication/LocalAuthentication.h",驗證手機系統是否支持指紋解鎖 iOS 8以后才行,驗證本手機是否開啟了指紋識別,是否錄入了指紋等

指紋登錄驗證:LoginViewController

//
// LoginViewController.m
// 指紋驗證
//
// 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以后才支持指紋
  return;
 } 
 UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];
 btn.frame = CGRectMake(0, 0, 160, 50);
 btn.center = self.view.center;
 [btn setTitle:@"點擊一下,指紋登錄" 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
{
 //創建LAContext
 LAContext* context = [[LAContext alloc] init];
 NSError* error = nil;
 if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
  //支持指紋驗證
  [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"請驗證已有指紋" reply:^(BOOL success, NSError *error) {
   if (success) {
    //驗證成功，主線程處理UI
    NSLog(@"成功啦");
    
    //用戶選擇輸入密碼，切換主線程處理
    dispatch_async(dispatch_get_main_queue(), ^{
     [self showMessage:@"指紋登錄成功!"];
    });
   }
   else
   {
    NSLog(@"%@",error.localizedDescription);
    switch (error.code) {
     case LAErrorSystemCancel:
     {
       [self showMessage:@"系統取消授權，如其他APP切入"];
      //系統取消授權，如其他APP切入
      break;
     }
     case LAErrorUserCancel:
     {
      //用戶取消驗證Touch ID
      [self showMessage:@"用戶取消驗證Touch ID"];
      break;
     }
     case LAErrorAuthenticationFailed:
     {
      //授權失敗
      [self showMessage:@"授權失敗"];
      break;
     }
     case LAErrorPasscodeNotSet:
     {
      //系統未設置密碼
      [self showMessage:@"系統未設置密碼"];
      break;
     }
     case LAErrorBiometryNotAvailable:
     {
      //設備Touch ID不可用，例如未打開
      [self showMessage:@"設備Touch ID不可用，例如未打開"];
      break;
     }
     case LAErrorBiometryNotEnrolled:
     {
      //設備Touch ID不可用，用戶未錄入
      [self showMessage:@"設備Touch ID不可用，用戶未錄入"];
      break;
     }
     case LAErrorUserFallback:
     {
      [[NSOperationQueue mainQueue] addOperationWithBlock:^{
       //用戶選擇輸入密碼，切換主線程處理
       [self showMessage:@"用戶選擇輸入密碼，切換主線程處理"];
       
      }];
      break;
     }
     default:
     {
      [[NSOperationQueue mainQueue] addOperationWithBlock:^{
       //其他情況，切換主線程處理
       [self showMessage:@"其他情況，切換主線程處理"];
      }];
      break;
     }
    }
   }
  }];
 }
 else
 {
  //不支持指紋識別，LOG出錯誤詳情
  NSLog(@"不支持指紋識別");
  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:@"確定", nil];
 [alert show];
}
@end

總結

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