ios - 翻转图像以显示 iOS

Question

基本的新手问题。

我希望将多张图片放入 Collection View 中。如何使用 swift 在 Xcode 中翻转图像以显示图像的背面？感谢大家的帮助。

Answer 1

我不确定您究竟想要实现什么，但我正在使用此功能水平旋转图像并在过渡期间更改图像。希望对您有所帮助。

private func flipImageView(imageView: UIImageView, toImage: UIImage, duration: NSTimeInterval, delay: NSTimeInterval = 0)
{
    let t = duration / 2

    UIView.animateWithDuration(t, delay: delay, options: .CurveEaseIn, animations: { () -> Void in

        // Rotate view by 90 degrees
        let p = CATransform3DMakeRotation(CGFloat(GLKMathDegreesToRadians(90)), 0.0, 1.0, 0.0)
        imageView.layer.transform = p

    }, completion: { (Bool) -> Void in

        // New image
        imageView.image = toImage

        // Rotate view to initial position
        // We have to start from 270 degrees otherwise the image will be flipped (mirrored) around Y axis
        let p = CATransform3DMakeRotation(CGFloat(GLKMathDegreesToRadians(270)), 0.0, 1.0, 0.0)
        imageView.layer.transform = p

        UIView.animateWithDuration(t, delay: 0, options: .CurveEaseOut, animations: { () -> Void in

            // Back to initial position
            let p = CATransform3DMakeRotation(CGFloat(GLKMathDegreesToRadians(0)), 0.0, 1.0, 0.0)
            imageView.layer.transform = p

        }, completion: { (Bool) -> Void in
        })
    })
}

不要忘记导入 GLKit。