Scaling & Rotating UIImageView through 2 finger swipe

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

NSArray *allTouches = [touches allObjects];

UITouch* t;
if([[event allTouches] count]==1){
if (CGRectContainsPoint([smallImage frame], [[allTouches objectAtIndex:0] locationInView:self.view])) {
t=[[[event allTouches] allObjects] objectAtIndex:0];
touch1=[t locationInView:nil];
}
}else{
t=[[[event allTouches] allObjects] objectAtIndex:0];
touch1=[t locationInView:nil];
t=[[[event allTouches] allObjects] objectAtIndex:1];
touch2=[t locationInView:nil];
}
}


- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

CGPoint currentTouch1;
CGPoint currentTouch2;
NSArray *allTouches = [touches allObjects];
UITouch* t;
float scale,rotation;

if([[event allTouches] count]==1){
t=[[[event allTouches] allObjects] objectAtIndex:0];
if (CGRectContainsPoint([smallImage frame], [[allTouches objectAtIndex:0] locationInView:self.view]))
{
touch2=[t locationInView:nil];
smallImage.center=CGPointMake(smallImage.center.x+touch2.x-touch1.x,smallImage.center.y+touch2.y-touch1.y);
touch1=touch2;
}
}
else if([[event allTouches] count]==2)
{
t=[[[event allTouches] allObjects] objectAtIndex:0];
currentTouch1=[t locationInView:nil];

t=[[[event allTouches] allObjects] objectAtIndex:1];
currentTouch2=[t locationInView:nil];


scale = [self distance:currentTouch1 toPoint:currentTouch2] / [self distance:touch1 toPoint:touch2];
rotation=atan2(currentTouch2.y-currentTouch1.y, currentTouch2.x-currentTouch1.x)-atan2(touch2.y-touch1.y,touch2.x-touch1.x);
if(isnan(scale)){
scale=1.0f;
}
NSLog(@"rotation %f",rotation);

NSLog(@"scale %f",scale);

if (CGRectContainsPoint([smallImage frame], [[allTouches objectAtIndex:0] locationInView:self.view]) &&
CGRectContainsPoint([smallImage frame], [[allTouches objectAtIndex:1] locationInView:self.view]))
{

smallImage.transform=CGAffineTransformScale(smallImage.transform, scale,scale);
smallImage.transform=CGAffineTransformRotate(smallImage.transform, rotation);
}
else // In case of scaling or rotating the background imageView
{
imageView.transform=CGAffineTransformScale(imageView.transform, scale,scale);
imageView.transform=CGAffineTransformRotate(imageView.transform, rotation);
}

touch1=currentTouch1;
touch2=currentTouch2;
}
}

-(double)distance:(CGPoint)point1 toPoint:(CGPoint)point2
{
return sqrt(fabs(point1.x - point2.x) + fabs(point1.y - point2.y));
}

Rotating an image with bounds & unchanged ratio

- (void)scaleAndRotateImage:(UIImage *)image
{
int kMaxResolution = 320; // Or whatever

CGImageRef imgRef = image.CGImage;

CGFloat width = CGImageGetWidth(imgRef);
CGFloat height = CGImageGetHeight(imgRef);

CGAffineTransform transform = CGAffineTransformIdentity;
CGRect bounds = CGRectMake(0, 0, width, height);
if (width > kMaxResolution || height > kMaxResolution) {
CGFloat ratio = width/height;
if (ratio > 1) {
bounds.size.width = kMaxResolution;
bounds.size.height = bounds.size.width / ratio;
}
else {
bounds.size.height = kMaxResolution;
bounds.size.width = bounds.size.height * ratio;
}
}

CGFloat scaleRatio = bounds.size.width / width;
CGSize imageSize = CGSizeMake(CGImageGetWidth(imgRef), CGImageGetHeight(imgRef));
CGFloat boundHeight;
UIImageOrientation orient = image.imageOrientation;
switch(orient) {

case UIImageOrientationUp: //EXIF = 1
transform = CGAffineTransformIdentity;
break;

case UIImageOrientationUpMirrored: //EXIF = 2
transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
break;

case UIImageOrientationDown: //EXIF = 3
transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;

case UIImageOrientationDownMirrored: //EXIF = 4
transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
break;

case UIImageOrientationLeftMirrored: //EXIF = 5
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, imageSize.width);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;

case UIImageOrientationLeft: //EXIF = 6
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(0.0, imageSize.width);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;

case UIImageOrientationRightMirrored: //EXIF = 7
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeScale(-1.0, 1.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;

case UIImageOrientationRight: //EXIF = 8
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, 0.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;

default:
[NSException raise:NSInternalInconsistencyException format:@"Invalid image orientation"];

}

UIGraphicsBeginImageContext(bounds.size);

CGContextRef context = UIGraphicsGetCurrentContext();

if (orient == UIImageOrientationRight || orient == UIImageOrientationLeft) {
CGContextScaleCTM(context, -scaleRatio, scaleRatio);
CGContextTranslateCTM(context, -height, 0);
}
else {
CGContextScaleCTM(context, scaleRatio, -scaleRatio);
CGContextTranslateCTM(context, 0, -height);
}

CGContextConcatCTM(context, transform);

CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, width, height), imgRef);
UIImage *imageCopy = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

[self setRotatedImage:imageCopy];
//return imageCopy;
}