iOS性能优化

1 UIKit性能

离屏渲染

1 设置阴影效果 会导致: 解决办法：粗线

imgView.layer.shadowColor = UIColor.blackColor().CGColor

imgView.layer.shadowOpacity = 1

imgView.layer.shadowRadius = 2

imgView.layer.shadowOffset = CGSizeMake(1, 1)

imgView.layer.shadowPath = UIBezierPath(rect: imgView.bounds).CGPath

2 设置圆角 可以使用光栅化技术将圆角缓存起来：

label.layer.masksToBounds = true

label.layer.cornerRadius = 8

label.layer.shouldRasterize = true

label.layer.rasterizationScale = layer.contentsScale

参考:UIKit性能调优实战讲解