我知道在 iOS 中，如果您让设备闲置 45 秒，屏幕会变暗，如果再闲置 15 秒，设备将自动锁定。

我们可以禁用自动锁定 [UIApplication sharedApplication].idleTimerDisabled = YES

但是，我确实想要这个功能，只是想让它更长一些，有什么方法(没有越狱)可以让我手动设置这个定时器吗？

谢谢

最佳答案

您可以通过监视用户与您的应用程序的交互(触摸事件)并在自定义空闲计时器到期时设置 [UIApplication sharedApplication].idleTimerDisabled = NO; 来在一定程度上实现这一点。

您可以了解有关监控事件的更多信息on this blog .不过，我在下面概述了 ARC 代码更新的步骤。

一些关于测试后可能发生的事情的背景知识。无论是否设置了 idleTimerDisabled = YES;，Apple 的内部空闲计时器都会运行。这意味着如果用户在设置 idleTimerDisabled = NO; 时没有与手机互动超过自动锁定设置(即 1 分钟)，设备将立即变暗并在之后完全关闭15 秒。所以我们可以做的是禁用 idleTimer，并手动创建一个新计时器，它会等待 x 分钟，然后再次启用 idleTimer。

这将有效地允许您增加自动锁定时间。我不认为你可以减少它(即用户有自动锁定从不，你想在一分钟后锁定设备)。

使用以下代码(假设您将自动锁定设置为 1 分钟)应用程序将保持唤醒状态 2 分钟，之后我们设置 idleTimerDisabled = NO; 将应用程序调暗 15 秒它会关闭。

1. 将以下两个文件添加到您的项目中(original source here) :

   ELCUIApplication.h

   //
   //  ELCUIApplication.h
   //
   //  Created by Brandon Trebitowski on 9/19/11.
   //  Copyright 2011 ELC Technologies. All rights reserved.
   //
   
   #import <Foundation/Foundation.h>
   
   // # of minutes before application times out
   #define kApplicationTimeoutInMinutes 2
   
   // Notification that gets sent when the timeout occurs
   #define kApplicationDidTimeoutNotification @"ApplicationDidTimeout"
   
   /**
    * This is a subclass of UIApplication with the sendEvent: method 
    * overridden in order to catch all touch events.
    */
   
   @interface ELCUIApplication : UIApplication {
       NSTimer *_idleTimer;
   }
   
   /**
    * Resets the idle timer to its initial state. This method gets called
    * every time there is a touch on the screen.  It should also be called
    * when the user correctly enters their pin to access the application.
    */
   - (void)resetIdleTimer;
   
   @end
   

   ELCUIApplication.m

   //
   //  ELCUIApplication.m
   //
   //  Created by Brandon Trebitowski on 9/19/11.
   //  Copyright 2011 ELC Technologies. All rights reserved.
   //
   
   #import "ELCUIApplication.h"
   
   @implementation ELCUIApplication
   
   - (void)sendEvent:(UIEvent *)event {
       [super sendEvent:event];
   
       // Fire up the timer upon first event
       if(!_idleTimer) {
           [self resetIdleTimer];
       }
   
       // Check to see if there was a touch event
       NSSet *allTouches = [event allTouches];
       if ([allTouches count] > 0) {
           UITouchPhase phase = ((UITouch *)[allTouches anyObject]).phase;
           if (phase == UITouchPhaseBegan) {
               [self resetIdleTimer];         
           }
       }
   }
   
   - (void)resetIdleTimer {
       if (_idleTimer) {
           [_idleTimer invalidate];
   //        [_idleTimer release];
       }
   
       // Schedule a timer to fire in kApplicationTimeoutInMinutes * 60
       float timeout = kApplicationTimeoutInMinutes * 60;
       _idleTimer = [NSTimer scheduledTimerWithTimeInterval:timeout
                                                     target:self 
                                                   selector:@selector(idleTimerExceeded) 
                                                   userInfo:nil 
                                                    repeats:NO];
   }
   
   - (void)idleTimerExceeded {
       /* Post a notification so anyone who subscribes to it can be notified when
        * the application times out */ 
       [[NSNotificationCenter defaultCenter]
        postNotificationName:kApplicationDidTimeoutNotification object:nil];
   }
   
   //- (void) dealloc {
   //  [_idleTimer release];
   //  [super dealloc];
   //}
   
   @end
   

2. 在您的 Supporting Files 文件夹中打开 main.m，更新以下内容:

   #import <UIKit/UIKit.h>
   #import "AppDelegate.h"
   
   int main(int argc, char *argv[])
   {
       @autoreleasepool {
           return UIApplicationMain(argc, argv,  @"ELCUIApplication", NSStringFromClass([AppDelegate class]));
       }
   }
   

3. 在 AppDelegate.m 中编辑 didFinishLaunchingWithOptions: 方法并添加 applicationDidTimeout: 方法。

   - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
   {
       // Override point for customization after application launch.
       [UIApplication sharedApplication].idleTimerDisabled = YES;
   
       [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidTimeout:)
                                                name:kApplicationDidTimeoutNotification object:nil];
       return YES;
   }
   
   - (void) applicationDidTimeout:(NSNotification *) notif {
       NSLog(@"applicationDidTimeout");
       [UIApplication sharedApplication].idleTimerDisabled = NO;
   }
   

关于ios - 如何为 iOS 手动设置设备的锁定时间，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21324060/