How can I rotate an UIImageView by 20 degrees?

Solution 1:

If you want to turn right, the value must be greater than 0 if you want to rotate to the left indicates the value with the sign "-". For example -20.

CGFloat degrees = 20.0f; //the value in degrees
CGFloat radians = degrees * M_PI/180;
imageView.transform = CGAffineTransformMakeRotation(radians);

Swift 4:

let degrees: CGFloat = 20.0 //the value in degrees
let radians: CGFloat = degrees * (.pi / 180)
imageView.transform = CGAffineTransform(rotationAngle: radians)

Solution 2:

A transformation matrix is not incredibly difficult. It's quite simple, if you use the supplied functions:

imgView.transform = CGAffineTransformMakeRotation(.34906585);

(.34906585 is 20 degrees in radians)

Swift 5:

imgView.transform = CGAffineTransform(rotationAngle: .34906585)

Solution 3:

Swift version:

let degrees:CGFloat = 20
myImageView.transform = CGAffineTransformMakeRotation(degrees * CGFloat(M_PI/180) )

Solution 4:

Swift 4.0

imageView.transform = CGAffineTransform(rotationAngle: CGFloat(20.0 * Double.pi / 180))

Solution 5:

Here's an extension for Swift 3.

extension UIImageView {

    func rotate(degrees:CGFloat){
        self.transform = CGAffineTransform(rotationAngle: degrees * CGFloat(M_PI/180))
      }  
    }

Usage:

myImageView.rotate(degrees: 20)