let layer = CAShapeLayer()
layer.fillRule = .nonZero
let path = UIBezierPath(svgPath: "M5.1,106.64C17.83,67.31 68.19,41.09 91.78,32.89C98.64,29.37 118.47,19.57 142.96,8.55C173.57,-5.22 202.22,-2.02 226.22,15.68C250.21,33.38 253.4,69.03 250.7,92.38C248.01,115.74 248.74,132.21 253.4,162.45C258.05,192.69 234.79,217.03 218.13,221.7C201.48,226.37 175.77,223.91 161.32,225.14C146.88,226.37 148.1,229.81 91.78,235.71C8.53,241.61 -10.82,155.81 5.1,106.64Z")//把svg的路径转换为贝塞尔路径
layer.path = path.cgPath
layer.position = CGPointMake((kScreenWidth-254.6)/2.0, 0.0)
self.img.layer.mask = layer
