ios - 如何在 iOS 中以菱形显示图像？

Question

Original image is like this Hai 我是 iOS 的新手，我的要求是以菱形显示图像，因此为此我遵循了以下代码。我拿了一个 UIView，而 ImageView 是那个 UIView 的 subview 。我正在得到菱形，但图像在翻转。如何解决这个问题？

  var tr: CGAffineTransform = CGAffineTransformIdentity
  tr = CGAffineTransformScale(tr, 0.8, 1)
  tr = CGAffineTransformRotate(tr, 0.7)
  self.views.transform =  tr

Answer 1

你可以使用UIBezierPath来绘制形状

import UIKit

extension UIView
{
    func addDiamondMaskToView()
    {
    let path = UIBezierPath()
    path.moveToPoint(CGPoint(x: self.bounds.size.width / 2.0, y: 0))
    path.addLineToPoint(CGPoint(x: self.bounds.size.width, y: self.bounds.size.height / 2.0))
    path.addLineToPoint(CGPoint(x: self.bounds.size.width / 2.0, y: self.bounds.size.height))
    path.addLineToPoint(CGPoint(x: 0, y: self.bounds.size.height / 2.0))
    path.closePath()

    let shapeLayer = CAShapeLayer()
    shapeLayer.path = path.CGPath
    shapeLayer.fillColor = UIColor.whiteColor().CGColor
    shapeLayer.strokeColor = UIColor.clearColor().CGColor

    self.layer.mask = shapeLayer
    }
}

你可以调用这个方法

//suppose this is your imageview
let imgView = UIImageView(frame: CGRectMake(0, 0, 100, 200))
//then call the method as
imgView.addDiamondMaskToView()

它对我来说工作正常，检查图像以供引用