ios - Call event every random number -

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im trying work out how event every random number. using following random number between 50 + 100

int x = (arc4random() % 50) + 50;

i want call selector based on returned value so.

[_hero schedule:@selector(randomanimation) interval:x];

im trying work out in head how rerun schedule after random time new random time.

in _hero class randomanimation method : 

-(void) randomanimation {      // animation stuff here      //      int x = (arc4random() % 50) + 50;     [self scheduleonce:@selector(randomanimation) delay:x];   }

and fire sequence 

[_hero randomanimation];

edit : if dont want expose randomanimation method, fire animation when object added scene :

-(void) onenter {     [super onenter];     [self randomanimation]; }

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