Swift：确定iOS屏幕尺寸

在Swift 3.0中

let screenSize = UIScreen.main.boundslet screenWidth = screenSize.widthlet screenHeight = screenSize.height

快点做：做这样的事情：

let screenSize: CGRect = UIScreen.mainScreen().bounds

那么您可以像这样访问宽度和高度：

let screenWidth = screenSize.widthlet screenHeight = screenSize.height

如果您想要屏幕宽度的75％，则可以执行以下操作：

let screenWidth = screenSize.width * 0.75

迅捷4.0

// Screen width.public var screenWidth: CGFloat {    return UIScreen.main.bounds.width}// Screen height.public var screenHeight: CGFloat {    return UIScreen.main.bounds.height}

在Swift 5.0中

let screenSize: CGRect = UIScreen.main.bounds