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如何在 iPhone 编程中旋转图像？

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4 回答 4

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可以在这里找到 Allen Brunson 的出色旋转和图像 UIImage 类别： http ://www.platinumball.net/blog/2010/01/31/iphone-uiimage-rotation-and-scaling/

于 2009-11-15T11:23:32.677 回答
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image.transform = CGAffineTransformMakeRotation(3.142);

将其旋转 180 度。

于 2011-10-30T15:44:13.807 回答
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您可以使用 CCGAffineTransform 旋转视图。您可以通过指定要旋转的弧度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。

于 2009-06-09T13:36:18.847 回答
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//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)
于 2017-08-24T13:24:47.670 回答