iphone怎么检测屏幕是否被点亮 （用UIApplication的Delegate）

本文转载至  http://gaohaijun.blog.163.com/blog/static/176698271201161524857373/ 

 

 

问题：那位能说一下怎么能检测到iphone的屏幕现在是否在被点亮的状态，还是被关闭的黑屏状态，
要用那个api ，给点提示 谢谢了。

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1. - (void)didTurnOnDisplay;
2. - (void)didTurnOffDisplay;

没有测试，但是相信可以。

刚刚测试，假如是子类化UIApplication是无法接受到这个方法的。用Objc Runtime的method_exchangeImplementations(method, method)就可以。

以下代码：

UIApplication方面：

 

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1. @interface UIApplication (_)
3. - (void)handleDidTurnOnDisplay;
4. - (void)handleDidTurnOffDisplay;
6. @end
8. @implementation UIApplication (_)
10. - (void)handleDidTurnOnDisplay
11. {
12.     NSLog(@"Did turn on display.");
13.     //[self handleDidTurnOnDisplay];
14.     
15. }
17. - (void)handleDidTurnOffDisplay
18. {
19.     NSLog(@"Did turn off display.");
20.     //[self handleDidTurnOffDisplay];
21. }
23. @end

UIApplicationDelegate:

 

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1. - (void)applicationDidFinishLaunching:(UIApplication *)application {    
2.     
3.     Method m1 = class_getInstanceMethod([UIApplication class], @selector(didTurnOnDisplay));
4.     Method m2 = class_getInstanceMethod([UIApplication class], @selector(didTurnOffDisplay));
5.     
6.     Method m3 = class_getInstanceMethod([UIApplication class], @selector(handleDidTurnOnDisplay));
7.     Method m4 = class_getInstanceMethod([UIApplication class], @selector(handleDidTurnOffDisplay));
8.     
9.     method_exchangeImplementations(m1, m3);
10.     method_exchangeImplementations(m2, m4);
11.     
12.     [window makeKeyAndVisible];
13. }
15. - (void)applicationWillResignActive:(UIApplication *)application
16. {
17.     NSLog(@"Application will resign active.");
18. }
20. - (void)applicationDidBecomeActive:(UIApplication *)application
21. {
22.     NSLog(@"Application did become active.");
23. }

以上代码在打开后关闭屏幕再打开的条件下输出：

引用

2009-08-17 19:05:37.770 *[380:207] Application did become active.
2009-08-17 19:06:36.370 *[380:207] Did turn off display.
2009-08-17 19:06:36.452 *[380:207] Application will resign active.
2009-08-17 19:06:43.310 *[380:207] Did turn on display.
2009-08-17 19:06:43.415 *[380:207] Application did become active. 

可见这个是方法在delegate的willResignActive和didBecomeActive之前调用。

 

其实屏幕在变黑时, 会通知程序
- (void)applicationWillResignActive:(UIApplication *)application;

而解锁后变亮会触发
- (void)applicationDidBecomeActive:(UIApplication *)application;