CODEWITHSUNDEEP
iosswiftcgaffinetransform
SwiftyJD
SwiftyJD

Reputation: 5441

CGAffineTransformConCat/ CGAffineTransformMakeScale in Swift 3

I'm trying to update a part of a function for swift 3:

  let newLabelOffset = CGFloat(direction.rawValue) * originalFrame.size.height/2

    newLabel.transform = CGAffineTransformConCat(
      CGAffineTransformMakeScale(1,0)
      CGAffineTransformMakeTranslation(0,newLabelOffset)
    )

I've heard that the new way of using CGAffineTransformConCat is concatenating(_:) but not entirely sure how to set it up based on the 2 above transforms.

Upvotes: 4

Views: 5301

Answers (2)

Bernard
Bernard

Reputation: 89

In swift, Function is overloadable. All matrix transform which contains translation, scale, rotate implemented by function CGAffineTransform() using different parameters.

init(rotationAngle: CGFloat)  // rotate
init(scaleX: CGFloat, y: CGFloat) // scale
init(translationX: CGFloat, y: CGFloat) // translation
func concatenating(CGAffineTransform) -> CGAffineTransform // matrix multiplication

Even, you can totally define transform matrix by using init(a: CGFloat, b: CGFloat, c: CGFloat, d: CGFloat, tx: CGFloat, ty: CGFloat), the construct of matrix is:

enter image description here

More: Apple developer documentation of CGAffineTransform

Upvotes: 0

Jože Ws
Jože Ws

Reputation: 1814

Init transforms,

let trans1 = CGAffineTransform(scaleX: 0, y: 0)
let trans2 = CGAffineTransform(translationX: 0,y: 1)

Concatenate,

trans1.concatenating(trans2)

Upvotes: 13

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