Image rotate and scale - iphone

Question

I need to rotate and scale a UIImageView image with the help of UISlider.
There are three condition when UISlider value is in its middle position then the original image will be its original position.
Second case, When slider value is maximum then image will rotate with 45 degree add bit scale.
Third case, when slider value is in its minimum position then image will rotate 45 degree in opposite direction and also bit scale.
I used this code but did not get desired result.
-(IBAction)sliderMoved:(id)sender
{
UIImage *image = [UIImage imageNamed:#"landscape.jpg"];
photoImage.transform = CGAffineTransformMakeRotation(slider.value * 2*M_PI_2 / slider.maximumValue);
CGFloat scale=0.5;
NSLog(#"sliderVlaue=%f",slider.value);
if ((slider.value) >(0.75)) {
scale =(.25+ slider.value);
} else {
scale =(0.75 +slider.value);
}
CGAffineTransform currentTransform = photoImage.transform;
CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale);
[photoImage setTransform:newTransform];
}

Answer 1

you can try this code
CGFloat Angle=(((int)slider.value*M_PI)/180);
transform=CGAffineTransformScale(transform, photoImage.scale, photoImage.scale);
transform= CGAffineTransformRotate(transform,Angle);
photoImage.transform = transform;

Answer 2

You can use this code for image rotation
imageview.transform = CGAffineTransformMakeRotation(M_PI);
For scaling an image
-(IBAction)grow
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
[UIView setAnimationRepeatCount:1];
[UIView setAnimationRepeatAutoreverses:YES];
CGRect b = grower.bounds;
b.size.height = 200;
b.size.width = 200;
grower.bounds = b;
[UIView commitAnimations];
}

Answer 3

I tried my self with the help of given hints and able to way out from my problem. here is the code`
in you h file declare UIImageView *photoImage;
UIView *canvas;
CAShapeLayer *_marque;
And in view did load
if (!_marque) {
_marque = [CAShapeLayer layer] ;
_marque.fillColor = [[UIColor clearColor] CGColor];
_marque.strokeColor = [[UIColor grayColor] CGColor];
_marque.lineWidth = 1.0f;
_marque.lineJoin = kCALineJoinRound;
_marque.lineDashPattern = [NSArray arrayWithObjects:[NSNumber numberWithInt:10],[NSNumber numberWithInt:5], nil];
_marque.bounds = CGRectMake(photoImage.frame.origin.x, photoImage.frame.origin.y, 0, 0);
_marque.position = CGPointMake(photoImage.frame.origin.x + canvas.frame.origin.x, photoImage.frame.origin.y + canvas.frame.origin.y);
}
[[self.view layer] addSublayer:_marque];
- (IBAction) sliderMoved:(id)sender
{
CGFloat scale=0;
NSLog(#"sliderVlaue=%f",slider.value);
if ((slider.value) >(0.77)) {
scale =(.5+ slider.value);
photoImage.transform = CGAffineTransformMakeRotation(((4*slider.value)*(M_PI/180)));
CGAffineTransform currentTransform = photoImage.transform;
CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale-.25, scale-.25);
[photoImage setTransform:newTransform];
NSLog(#"max=%f",scale);
}else if(slider.value< 0.77 && slider.value >.73){
photoImage.transform=CGAffineTransformIdentity;
photoImage.frame=imageframe;
scale =(0.5 +slider.value);
NSLog(#"mid=%f",scale);
}
else{
scale =(.77 +(1.0-slider.value));
photoImage.transform = CGAffineTransformMakeRotation((((-4)*(slider.value))*(M_PI/180)));
CGAffineTransform currentTransform = photoImage.transform;
CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale);
[photoImage setTransform:newTransform];
NSLog(#"min=%f",scale);
}
//_lastScale = 1;
[self showOverlayWithFrame:photoImage.frame];
}
-(void)showOverlayWithFrame:(CGRect)frame {
if (![_marque actionForKey:#"linePhase"]) {
CABasicAnimation *dashAnimation;
dashAnimation = [CABasicAnimation animationWithKeyPath:#"lineDashPhase"];
[dashAnimation setFromValue:[NSNumber numberWithFloat:0.0f]];
[dashAnimation setToValue:[NSNumber numberWithFloat:15.0f]];
[dashAnimation setDuration:0.5f];
[dashAnimation setRepeatCount:HUGE_VALF];
[_marque addAnimation:dashAnimation forKey:#"linePhase"];
}
_marque.bounds = CGRectMake(frame.origin.x, frame.origin.y, 0, 0);
_marque.position = CGPointMake(frame.origin.x + canvas.frame.origin.x, frame.origin.y + canvas.frame.origin.y);
CGMutablePathRef path = CGPathCreateMutable();
CGPathAddRect(path, NULL, frame);
[_marque setPath:path];
CGPathRelease(path);
_marque.hidden = NO;
}

Answer 4

You can do it with the following code:
- (void)viewDidLoad
{
[super viewDidLoad];
imgToRotate = [[UIImageView alloc]initWithFrame:CGRectMake(48, 208, 240, 240)];
imgToRotate.image = [UIImage imageNamed:#"rtm.jpeg"];
[self.view addSubview:imgToRotate];
}
- (IBAction)slideToRotateScale:(UISlider *)sender
{
sender.maximumValue = 1.0;
sender.minimumValue = -1.0;
imgToRotate.transform = CGAffineTransformRotate(CGAffineTransformMakeScale(fabsf(sender.value), fabs(sender.value)), sender.value*M_PI/4);
}