我正在开发一个需要"锁定屏幕"的应用程序，用户必须输入密码才能访问存储在应用程序中的数据。
每当应用程序启动时以及用户处于非活动状态几分钟后，都应显示此锁定屏幕。
目前，我的故事板中有一个单独的UIView控制器，它没有连接到故事板中的任何其他视图。我知道我可以通过向 [self storyboard] 发送实例化视图控制器与标识符来访问此视图控制器。无论这在应用程序委托中不起作用。
但我需要在应用委托尝试打开数据库之前从应用委托调用锁屏
。实现这一点的好方法是什么？
这可能是一个较晚的答案，但我不得不使用情节提要为我的一位客户实现相同的要求。您可以从此处下载完整项目。希望这可能会对某人有所帮助。
我创建了两个视图控制器，一个是 MainView，另一个需要四位数代码才能关闭。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RoundRectButton，它调用了"lockIt"方法。该方法只是执行 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
要在 appDelegate 的 HomeVC 上显示 lockVC，请使用以下命令：
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];
没有必要（我实际上不建议将其用于这只海豚）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）。然后从按钮操作调用[self performSegueWithIdentifier:@"lockItSegue" sender:self];在LockScreen的逻辑（BlockKeypadViewController.m）上（一旦用户输入了正确的代码），调用[self dismissViewControllerAnimated:YES completion:nil];