Why does this code cause the compiler to report "Unused Variable" in Xcode"

Question

NSTimer *valor = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(update) userInfo:nil repeats:YES];

Answer 1

You need to use valor somewhere else. Since it is a timer, you'd probably want to retain it somehow such as setting a property to it:

self.timer = valor;