An implementation in which iOS monitors whether a user touches a screen

A recent requirement in the project is that the user is prompted for 8 seconds if the user does not interact with the screen.

After Google and practice to find a way to achieve the following steps:

1. Let appdelegate inherit uiapplication rather than Uiresponser.

2. Overloaded Sendevent method.

-(void) Sendevent: (Uievent *) event
{
    Super sendevent:event];//here must not be missed, otherwise the app will not start successfully.
    
    nsset *alltouches = [Event Alltouches];
    if ([alltouches count] > 0)
    {
        Uitouchphase phase = ((Uitouch *) [alltouches Anyobject]). Phase;
        if (phase = = Uitouchphasebegan)
            NSLog (@ "Send event");
    }

3. In order to allow the appdelegate of the inherited uiapplication to work, it is necessary to main.m

Uiapplicationmain

Change to:

Uiapplicationmain (argc, argv, Nsstringfromclass ([Appdelegate class]), Nsstringfromclass ([Appdelegate class]);