Question

我知道在iOS中，如果你让你的设备闲置45秒，屏幕会变暗，如果再闲置15秒，设备将自动锁定。

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

然而，我确实想要这个功能，只是想让它更长，有没有任何方法（没有越狱），我可以手动设置这个计时器？

感谢

Answer 1

您可以通过监控用户与您的应用的互动（触摸事件）并在自定义空闲计时器到期时设置[UIApplication sharedApplication].idleTimerDisabled = NO;来实现此目的。

您可以详细了解监控事件on this blog。但是，我已经通过ARC的代码更新概述了以下步骤。

有关测试后可能发生的事情的一些背景知识。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;时没有通过自动锁定设置（即1分钟）与电话进行交互，则设备将立即调暗一半并在15秒后完全关闭。所以我们可以做的是禁用idleTimer，并手动创建一个新的计时器，在再次启用idleTimer之前等待x分钟。

这样可以有效地增加自动锁定时间。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），应用程序将保持清醒2分钟，之后我们将应用程序设置idleTimerDisabled = NO; 15秒，然后关闭。

将以下两个文件添加到项目(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

在您的支持文件文件夹中打开 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]));
    }
}

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;
}

如何为iOS手动设置设备的锁定时间

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