快速，旋转 ImageView 并将旋转 ImageView 设置为 uibutton

Question

我想单击按钮并用动画旋转其图像。动画完成后，我想为按钮设置新的旋转图像。然而，由于某种原因，旋转图像未设置为正常状态的按钮。它设置为突出显示状态。我有 bool 值 isPriceOrdered ，根据这个 bool 值我设置向上或向下箭头。这是一个代码:

   UIView.animateWithDuration(0.3, animations: {
             self.buttonimage.imageView!.transform = CGAffineTransformMakeRotation(CGFloat(M_PI))
        }, completion: {
            (success) in
            if self.isPriceOrderAsc == true {
                self.isPriceOrderAsc = false
                let rotatedimage = UIImage(CGImage: (self.buttonimage.imageView!.image!.CGImage)!, scale: CGFloat(1.0), orientation: UIImageOrientation.DownMirrored)

                self.buttonimage.setImage(rotatedimage, forState: .Normal)


            }else{
                self.isPriceOrderAsc = true
                let rotatedimage = UIImage(CGImage: (self.buttonimage.imageView?.image!.CGImage)!, scale: CGFloat(1.0), orientation: UIImageOrientation.UpMirrored)

                self.buttonimage.setImage(rotatedimage, forState: .Normal)
            }
    })

Answer 1

问题是我在转换图像之前没有保存按钮的原始转换。在变换图像度数之前保存变换后的原始图像。这是一段代码:

var originalTransform: CGAffineTransform?

 UIView.animateWithDuration(0.3, animations: {

            if self.buttonPriceOrder.imageView != nil {
                originalTransform = self.buttonPriceOrder.imageView!.transform
                self.buttonPriceOrder.imageView!.transform = CGAffineTransformMakeRotation(CGFloat(M_PI))
            }

        }, completion: {
            (success) in

            if success {

                self.buttonPriceOrder.imageView?.transform = originalTransform!

                if self.isPriceOrderAsc == true {
                    self.isPriceOrderAsc = false
                    let rotatedimage = UIImage(CGImage: (self.buttonPriceOrder.imageView!.image!.CGImage)!, scale: CGFloat(1.0), orientation: UIImageOrientation.DownMirrored)
                    self.buttonPriceOrder.setImage(rotatedimage, forState: .Normal)

                }else{
                    self.isPriceOrderAsc = true
                    let rotatedimage = UIImage(CGImage: (self.buttonPriceOrder.imageView?.image!.CGImage)!, scale: CGFloat(1.0), orientation: UIImageOrientation.UpMirrored)
                    self.buttonPriceOrder.imageView?.image = nil
                    self.buttonPriceOrder.setImage(rotatedimage, forState: .Normal)

                }
                self.isFilterActive = true
                self.delegate.filterUpdated(self)
            }

    })

图像旋转后，在将图像设置为按钮之前，将按钮变换设置为原始图像。