UIImage 3Transform swift - ios

Question

how could i transform image to look like one from the image ?
just want to reach how that transformation works
for rotating im using an extention of UIImage, but thats all a got for now, just new in swift
public func imageRotatedByDegrees(degrees: CGFloat, flip: Bool) -> UIImage {
let radiansToDegrees: (CGFloat) -> CGFloat = {
return $0 * (180.0 / CGFloat(M_PI))
}
let degreesToRadians: (CGFloat) -> CGFloat = {
return $0 / 180.0 * CGFloat(M_PI)
}
// calculate the size of the rotated view's containing box for our drawing space
let rotatedViewBox = UIView(frame: CGRect(origin: CGPointZero, size: size))
let t = CGAffineTransformMakeRotation(degreesToRadians(degrees));
rotatedViewBox.transform = t
let rotatedSize = rotatedViewBox.frame.size
// Create the bitmap context
UIGraphicsBeginImageContext(rotatedSize)
let bitmap = UIGraphicsGetCurrentContext()
// Move the origin to the middle of the image so we will rotate and scale around the center.
CGContextTranslateCTM(bitmap, rotatedSize.width / 2.0, rotatedSize.height / 2.0);
// // Rotate the image context
CGContextRotateCTM(bitmap, degreesToRadians(degrees));
// Now, draw the rotated/scaled image into the context
var yFlip: CGFloat
if(flip){
yFlip = CGFloat(-1.0)
} else {
yFlip = CGFloat(1.0)
}
CGContextScaleCTM(bitmap, yFlip, -1.0)
CGContextDrawImage(bitmap, CGRectMake(-size.width / 2, -size.height / 2, size.width, size.height), CGImage)
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage
}

Answer 1

You would need to use Core Animation with CATransform3D, and tweak the transform to give an impression of depth. What you do is to apply a small negative value (-1/200 is a good starting point) to the M34 component of the transformation matrix. You could ether do that to the layer of each of your views, or use a CATransformLayer on a super layer and then add the other images as sublayers of the transform layer.
This is tricky, fussy stuff. I haven't messed with it in a while so I don't remember the fine details any more, but that should be enough to get you started. I suggest searching on "iOS perspective", "M34" and "CATransformLayer" to find out more.