toggle 反转
OS 定义
@inlinable public mutating func toggle()
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struct Layer {
var isHidden = false
}
struct View {
var layer = Layer()
}
var view = View()
// 之前：
view.layer.isHidden = !view.layer.isHidden
view.layer.isHidden // true
// 现在，是不是方便了许多
view.layer.isHidden.toggle() // false
before
self.view?.isHidden = ! self.view?.isHidden
after
self.view?.isHidden.toggle()
