Loops in Objective C?

FROM : Nathan
DATE : Mon May 26 21:20:14 2008

so I have a .m file, here's the contents.

#import "RotationHandler.h"

@implementation RotationHandler
int z=1;
float rot;
- (IBAction)buttonRelease:(id)sender {
   do
   {
       rot=rot-0.5;
       [sliderRotation setFrameCenterRotation: rot];
       [printRotation setFloatValue: rot];
   }
   while(z=1);
}

@end

I won't bother showing you the other files in the project I know 
they're all in order. So I want the object receiving sliderRotation to 
rotate, in the above code I want it to rotate forever. If I remove the 
loop, each time I press the button it rotates -.5 degrees. But with 
the loop in there, I get the horrible spinning beachball of eternity 
when I press the button and the object that is supposed to rotate 
never moves. Do I have to use some special Objective C loop?