Theos - How to call instance methods from a different class

Question

Basically what I'm trying to do is call the attemptDeviceUnlockWithPassword method from SBDeviceLockScreenViewController's lockScreenView method. What is the proper way to call an instance method from a different class?

%hook SBLockScreenViewController

-(void)lockScreenView:(id)view didScrollToPage:(int)page
{
    if (page==0)
    {
    //call attemptDeviceUnlockWithPassword:@"0000" appRequested:NO
    }
    %orig;
}

%end

%hook SBDeviceLockController

- (BOOL)attemptDeviceUnlockWithPassword:(NSString *)passcode appRequested:(BOOL)requested
{

    return %orig;

}

%end

I think you need to learn the basics of objective-c first, try the tag's wiki. — Jonathan., Mar 26 '14 at 02:53

score 2 · Answer 1 · answered Mar 26 '14 at 10:55

In order to be able to call an instance method you need an instance of a class. You can see from the SBDeviceLockController header that there is a class method +(id)sharedController. This method will return an instance which you can call instance methods on.

There are quite a few classes in SpringBoard that follow this pattern of having a class method return the a singleton instance (this is called the Singleton pattern).

You need to learn more about the basics of Objective-C before doing tweak development, try just creating a simple app. The Apple documentation is pretty good (try starting here), and there are many other resources on the internet (such as the Stanford CS193P course).

Theos - How to call instance methods from a different class

1 Answers1