[英]How do I rotate an image on the iPhone?
如何在iPhone编程中旋转图像?
可以在以下位置找到Allen Brunson出色的旋转和图像UIImage类别: http : //www.platinumball.net/blog/2010/01/31/iphone-uiimage-rotation-and-scaling/
image.transform = CGAffineTransformMakeRotation(3.142);
将其旋转180度。
//If someone needs in swift 3
func rotateImageClockWise(theImage: UIImage,imageView:UIImageView) -> UIImage {
var orient: UIImageOrientation!
let imgOrientation = theImage.imageOrientation
UIView.transition(with: imageView, duration: 0.2, options: .transitionCrossDissolve, animations: {() -> Void in
switch imgOrientation {
case .left:
orient = .up
case .right:
orient = .down
case .up:
orient = .right
case .down:
orient = .left
case .upMirrored:
orient = .rightMirrored
case .downMirrored:
orient = .leftMirrored
case .leftMirrored:
orient = .upMirrored
case .rightMirrored:
orient = .downMirrored
}
}, completion: { _ in })
let rotatedImage = UIImage(cgImage: theImage.cgImage!, scale: 1.0, orientation: orient)
return rotatedImage
}
//Just call the method like this :
rotateImageClockWise(theImage: UIImage,imageView:UIImageView)
You can rotate a view using a CCGAffineTransform. 您可以使用CCGAffineTransform旋转视图。 You can create a rotation matrix by specifying the degrees in radians you want to rotate, then setting the rotation matrix to be the .transform property of your view. 您可以通过指定要旋转的弧度数来创建旋转矩阵,然后将旋转矩阵设置为视图的.transform属性。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.