为 iOS 应用程序实现锁屏

Question

我正在开发一个需要“锁定屏幕”的应用，用户必须在其中输入密码才能访问存储在应用中的数据。

应用程序启动时和用户不活动几分钟后，应显示此锁定屏幕。

目前，我的故事板中有一个单独的 UIViewController，它没有连接到故事板中的任何其他视图。我知道我可以通过将 instantiateViewControllerWithIdentifier 发送到 [self storyboard] 来访问这个视图控制器。但是，这在应用委托中不起作用。

但我需要在应用代理尝试打开数据库之前从应用代理调用锁定屏幕。

什么是实现这个的好方法？

Answer 1

这可能是一个较晚的答案，但我必须为我的一位使用 Storyboard 的客户实施相同的要求。 You can download the full project from here。希望这可以帮助某人。

我创建了两个 Viewcontroller，一个是 MainView，另一个需要一个四位数的代码才能关闭。我在 MainView 和 BlockKeypadViewController 之间创建了一个模态 segue，并将其命名为“lockItSegue”。 在 MainView 上，我插入了一个调用“lockIt”方法的 RoundRectButton。 该方法只执行segue“lockItSegue”。

- (IBAction)lockIt:(id)sender 
{
    [self performSegueWithIdentifier:@"lockItSegue" sender:self];
}

在 BlockKeypadViewController.h 上，我创建了

//
//  BlockKeypadViewController.h
//  Consultablet
//
//  Created by EDGARD AGUIRRE ROZO on 22/03/13.
//  Copyright (c) 2013 Colombia Creative Software. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>

@interface BlockKeypadViewController : UIViewController
@property (strong, nonatomic) IBOutlet UILabel *wrongCodeLabel;//*codigoIncorrectoLabel;
@property (strong, nonatomic) IBOutlet UILabel *tryAgainLabel;//*trateNuevamenteLabel;

@property (strong, nonatomic) IBOutlet UILabel *digit1;//*caracter1;
@property (strong, nonatomic) IBOutlet UILabel *digit2;//*caracter2;
@property (strong, nonatomic) IBOutlet UILabel *digit3;//*caracter3;
@property (strong, nonatomic) IBOutlet UILabel *digit4;//*caracter4;
@property int counter;//contador;
@property int codeIn;//claveIngresado;
@property int unlockCode;//claveDesbloqueo;
-(void) calculate:(int)number;//calcular:(int)numero;
- (IBAction)one:(id)sender;//uno:(id)sender;
- (IBAction)two:(id)sender;//dos:(id)sender;
- (IBAction)three:(id)sender;//tres:(id)sender;
- (IBAction)four:(id)sender;//cuatro:(id)sender;
- (IBAction)five:(id)sender;//cinco:(id)sender;
- (IBAction)six:(id)sender;//seis:(id)sender;
- (IBAction)seven:(id)sender;//siete:(id)sender;
- (IBAction)eight:(id)sender;//ocho:(id)sender;
- (IBAction)nine:(id)sender;//nueve:(id)sender;
- (IBAction)zero:(id)sender;//cero:(id)sender;
- (IBAction)cancel:(id)sender;//cancel:(id)sender;
-(void)checkCode;//verificarClave;

@end

在 BlockKeypadViewController.m 上：

//
//  BlockKeypadViewController.m
//  Consultablet
//
//  Created by EDGARD AGUIRRE ROZO on 22/03/13.
//  Copyright (c) 2013 Colombia Creative Software. All rights reserved.
//

#import "BlockKeypadViewController.h"
@implementation UILabel (My2)
//- (void)setImage:(UIImage *)image forState:(UIControlState)state animated:(BOOL)animated
- (void)setHidden:(BOOL)hidden animated:(BOOL)animated
{
    //[self setImage:image forState:state];
    [self setHidden:hidden];
    if (animated)
    {
        CATransition *animation = [CATransition animation];
        [animation setType:kCATransitionFade];
        [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
        [animation setFillMode:kCAFillModeBoth];
        [animation setDuration:.3];
        [[self layer] addAnimation:animation forKey:@"UILabelSetAnimationKey"];
    }
}
- (void)setHidden:(BOOL)hidden animated:(BOOL)animated seconds:(int)seconds
{
    //[self setImage:image forState:state];
    [self setHidden:hidden];
    if (animated)
    {
        CATransition *animation = [CATransition animation];
        [animation setType:kCATransitionFade];
        [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
        [animation setFillMode:kCAFillModeBoth];
        [animation setDuration:seconds];
        [[self layer] addAnimation:animation forKey:@"UILabelSetAnimationKey"];
    }
}
@end
@interface BlockKeypadViewController ()

@end

@implementation BlockKeypadViewController
@synthesize digit1,digit2,digit3,digit4,counter,codeIn,unlockCode,wrongCodeLabel,tryAgainLabel;

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.counter = 1;
    self.codeIn=0;

    self.unlockCode=1234;
    NSLog(@"Unlock Code %d",self.unlockCode);

    [digit1 setHidden:YES animated:YES];
    [digit2 setHidden:YES animated:YES];
    [digit3 setHidden:YES animated:YES];
    [digit4 setHidden:YES animated:YES];
}
-(void)checkCode
{
    if(self.codeIn==self.unlockCode)
    {
        [self dismissViewControllerAnimated:YES completion:nil];
    }
    else
    {
        [wrongCodeLabel setHidden:NO animated:YES seconds:.1];
        [tryAgainLabel setHidden:NO animated:YES seconds:.1];
        [self.digit1 setHidden:YES animated:YES];
        [self.digit2 setHidden:YES animated:YES];
        [self.digit3 setHidden:YES animated:YES];
        [self.digit4 setHidden:YES animated:YES];
        self.codeIn = 0;

        NSLog(@"Wrong Code");
    }
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}
-(void) calculate:(int)number
{
    if(self.counter==1)
    {
        [wrongCodeLabel setHidden:YES animated:YES seconds:.2];
        [tryAgainLabel setHidden:YES animated:YES seconds:.2];
        [self.digit1 setHidden:NO animated:YES];
        self.codeIn = number*1000;
    }
    if(self.counter==2)
    {
        [self.digit2 setHidden:NO animated:YES];
        self.codeIn = self.codeIn+number*100;
    }
    if(self.counter==3)
    {
        [self.digit3 setHidden:NO animated:YES];
        self.codeIn = self.codeIn+number*10;
    }
    if(self.counter==4)
    {
        [self.digit4 setHidden:NO animated:YES];
        self.codeIn = self.codeIn+number;
        [self performSelector:@selector(checkCode) withObject:nil afterDelay:0.2];
    }
    if(self.counter<4)
    {
        self.counter++;
    }
    else
    {
        self.counter=1;
    }
}
- (IBAction)one:(id)sender
{
    [self calculate:1];
}
- (IBAction)two:(id)sender
{
    [self calculate:2];
}
- (IBAction)three:(id)sender
{
    [self calculate:3];
}
- (IBAction)four:(id)sender
{
    [self calculate:4];
}
- (IBAction)five:(id)sender
{
    [self calculate:5];
}
- (IBAction)six:(id)sender
{
   [self calculate:6];
}
- (IBAction)seven:(id)sender
{
    [self calculate:7];
}
- (IBAction)eight:(id)sender
{
    [self calculate:8];
}
- (IBAction)nine:(id)sender
{
    [self calculate:9];
}
- (IBAction)zero:(id)sender
{
    [self calculate:0];
}
- (IBAction)cancel:(id)sender
{
    [self.digit1 setHidden:YES animated:YES];
    [self.digit2 setHidden:YES animated:YES];
    [self.digit3 setHidden:YES animated:YES];
    [self.digit4 setHidden:YES animated:YES];
    self.codeIn = 0;
    self.counter = 1;
}


@end

Answer 2

要从 appDelegate 在 HomeVC 上显示 lockVC，请使用：

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
HomeVC *hvc = [storyboard instantiateViewControllerWithIdentifier:@"HomeVC"];
self.window.rootViewController = hvc;
[self.window makeKeyAndVisible];

LockVC *lvc = [storyboard instantiateViewControllerWithIdentifier:@"LockVC"] 
[self.window.rootViewController presentViewController:lvc animated:YES completion:nil];

Answer 3

没有必要（我实际上不建议将它用于这只海豚）使用AppDelegate 来实现这个或任何LockScreen 解决方案。您应该创建一个从RootViewController 到LockScreen 的segue，并根据需要命名（例如lockItSegue）。然后从按钮动作调用[self performSegueWithIdentifier:@"lockItSegue" sender:self]; 在LockScreen的逻辑（BlockKeypadViewController.m）上（一旦用户输入正确的代码），调用[self dismissViewControllerAnimated:YES completion:nil];