I am putting my answer in a similar format to this answer.

Here is the original label:

Rotate 90 degrees clockwise:

yourLabelName.transform = CGAffineTransform(rotationAngle: CGFloat.pi / 2)

Rotate 180 degrees:

yourLabelName.transform = CGAffineTransform(rotationAngle: CGFloat.pi)

Rotate 90 degrees counterclockwise:

yourLabelName.transform = CGAffineTransform(rotationAngle: -CGFloat.pi / 2)

Do the same thing to rotate a button. Thankfully the touch events also get rotated so the button is still clickable in its new bounds without having to do anything extra.

yourButtonName.transform = CGAffineTransform(rotationAngle: CGFloat.pi / 2)

Notes:

Documentation for CGAffineTransform

The basic format is CGAffineTransform(rotationAngle: CGFloat) where rotationAngle is in radians, not degrees.

There are 2π radians in a full circle (360 degrees). Swift includes the useful constant CGFloat.pi.

• CGFloat.pi = π = 180 degrees
• CGFloat.pi / 2 = π/2 = 90 degrees

Auto Layout:

Auto layout does not work with rotated views. (See Frame vs Bounds for an explanation why.) This problem can be solved by creating a custom view. This answer shows how to do it for a UITextView, but it is the same basic concept for a label or button. (Note that you will have to remove the CGAffineTransformScale line in that answer since you don't need to mirror the text.)

Related

• How to do transforms on a CALayer?
• How to apply multiple transforms in Swift
• CTM transforms vs Affine Transforms in iOS (for translate, rotate, scale)

If you do this a lot, you'll wan't to make an extension. Also this will allow you to rotate your view 0-360 degrees.

extension UIView {    func rotate(degrees: CGFloat) {        rotate(radians: CGFloat.pi * degrees / 180.0)    }    func rotate(radians: CGFloat) {        self.transform = CGAffineTransform(rotationAngle: radians)    }}

Then you can simply call rotate on your views

myView.rotate(degrees: 90)

swift

Rotate 90 degrees clockwise:

    var rotateLabel: UILabel = UILabel(frame: CGRectMake(100, 0, 28, 159))        rotateLabel.textAlignment = .Right        rotateLabel.text = "Hello!"        self.view.addSubview(rotateLabel)        rotateLabel.transform = CGAffineTransformMakeRotation(CGFloat(M_PI_2))        rotateLabel.frame = CGRectMake(100, 0, 28, 159)

Rotate 90 degrees counterclockwise:

    var rotateLabel: UILabel = UILabel(frame: CGRectMake(100, 0, 28, 159))        rotateLabel.textAlignment = .Right        rotateLabel.text = "Hello!"        self.view.addSubview(rotateLabel)        rotateLabel.transform = CGAffineTransformMakeRotation(CGFloat(-M_PI_2))        rotateLabel.frame = CGRectMake(100, 0, 28, 159)