ios - iPhone Objective-c 检测屏幕锁定

Question

我刚开始使用 Objective-c 制作 iPhone 应用程序

我想制作在 iPhone 屏幕锁定时发送通知的应用程序(按下锁定按钮)我怎样才能制作这个应用程序？

我正在尝试使用“applicationWillSuspend”实现它，但是

/*----------------------------------------*/
- (void)applicationWillSuspend
{
     NSLog(@"WillSuspend");
}
/*----------------------------------------*/

此代码无效

我不确定何时调用 applicationWillSuspend

请给我一些知识

#import "AppDelegate.h"
#import <notify.h>

@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    // iOS8 Notification permit
    if ([UIApplication
         instancesRespondToSelector:@selector(registerUserNotificationSettings:)]) {
        [[UIApplication sharedApplication]
         registerUserNotificationSettings:[UIUserNotificationSettings
                                           settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeSound
                                           categories:nil]];
    }
    return YES;

    int notify_token;
    notify_register_dispatch("com.apple.springboard.lockstate",
                             &notify_token,
                             dispatch_get_main_queue(),
                             ^(int token)
                             {
                                 uint64_t state = UINT64_MAX;
                                 notify_get_state(token, &state);
                                 if(state == 0) {
                                     NSLog(@"unlock device");
                                 } else {
                                     NSLog(@"lock device");
                                 }
                             }
                             );

}

Answer 1

在应用委托(delegate)中导入这个 #import <notify.h>

把这段代码写在didFinishLaunchingWithOptions

int notify_token;
    notify_register_dispatch("com.apple.springboard.lockstate",
                         &notify_token,
                         dispatch_get_main_queue(),
                         ^(int token)
                         {
                             uint64_t state = UINT64_MAX;
                             notify_get_state(token, &state);
                             if(state == 0) {
                                 NSLog(@"unlock device");
                             } else {
                                 NSLog(@"lock device");
                             }
                         }
                         );

因此，一旦您的 iPhone 被锁定，您将获得“锁定设备”作为日志。所以你可以在那个 block 中编写你的代码。这会对您有所帮助。