how to rotate shapes using the shape.transform property (uses CGAffineTransform)

C4WorkSpace.m

//
//  C4WorkSpace.m
//  rotate
//
//  Created by Travis Kirton on 12-04-04.
//  Copyright (c) 2012 POSTFL. All rights reserved.
//

#import "C4WorkSpace.h"

C4Shape *s1, *s2;

@implementation C4WorkSpace

-(void)setup {
    s1 = [C4Shape rect:CGRectMake(200, 200, 100, 100)];
    [self.canvas addShape:s1];
    
    s2 = [C4Shape rect:CGRectMake(500, 200, 100, 100)];
    s2.layer.anchorPoint = CGPointMake(0, 2);
    [self.canvas addShape:s2];
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    s1.animationDuration = 1.0f;
    s1.animationOptions = AUTOREVERSE | REPEAT;
    s1.transform = CGAffineTransformMakeRotation(PI);
    
    s2.animationDuration = 1.0f;
    s2.animationOptions = AUTOREVERSE | REPEAT;
    s2.transform = CGAffineTransformMakeRotation(PI);
}

@end