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2回目に画像を回転しようとすると、アプリにバグが発生する理由がわかりません

-(UIImage *)rotateImage:(UIImage *)image{
    // calculate the size of the rotated view's containing box for our drawing space
    CGSize rotatedSize = image.size;

    // Create the bitmap context
    UIGraphicsBeginImageContext(rotatedSize);
    CGContextRef bitmap = UIGraphicsGetCurrentContext();

    // Move the origin to the middle of the image so we will rotate and scale around the center.
    CGContextTranslateCTM(bitmap, rotatedSize.width/2, rotatedSize.height/2);

    //   // Rotate the image context
    CGContextRotateCTM(bitmap, DegreesToRadians(90));

    // Now, draw the rotated/scaled image into the context
    CGContextScaleCTM(bitmap, 1.0, -1.0);
    CGContextDrawImage(bitmap, CGRectMake(-image.size.width / 2, -image.size.height / 2, image.size.width, image.size.height), image.CGImage);

    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;

}

そして、私はこの関数を次のように呼び出します:

 NSLog(@"%f %f",rotatedOriginImage.size.width,rotatedOriginImage.size.height);
    rotatedOriginImage = [self rotateImage:rotatedOriginImage];

初めてログに記録します:

2012-07-11 17:22:50.825 meshtiles[3330:707] 600.000000 600.000000

しかし、2回目では:

2012-07-11 17:22:55.253 meshtiles[3330:707] *** -[UIImage size]: message sent to deallocated instance 0x8452560

この場合のサポートがあれば、助けてください

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