旋转动画xcode iphone

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ViewController.h

#import <UIKit/UIKit.h>

 @interface ViewController : UIViewController
 {
         IBOutlet UIImageView *theImageView;
         IBOutlet UIButton    *theButton;
         NSTimer              *theTimer;
         float        angle;
         BOOL         runStop;
     }


 @property (atomic,retain) IBOutlet UIImageView *theImageView;
 @property (atomic,retain) IBOutlet UIButton    *theButton;

 -(IBACtion)runRoulette:(id)sender;

 @end

ViewController.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize theButton,theImageView;


- (void)viewDidLoad
{
    angle = 0;
    runStop = falSE;
    [super viewDidLoad];
    // Do any additional setup after loading the view,typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void)rotateRoulette
{
    theImageView.center = CGPointMake(self.theImageView.center.x,self.theImageView.center.y);
    theImageView.transform=CGAffineTransformMakeRotation (anglE);
    angle+=0.001;
}


-(IBACtion)runRoulette:(id)sender
{
    if(!runStop)
    {
        theTimer = [NSTimer scheduledTimerWithTimeInterval:1.0/600.0 target:self SELEctor:@SELEctor(rotateRoulettE) userInfo:nil repeats:YES];
    }
    else
    {
        [theTimer invalidate];
        theTimer = nil;
    }
    runStop = !runStop;
}
@end