我已经为幻灯片菜单控制器定义了一个类。所以,我有以下代码:未使用的可选绑定违例:在使用swiftlint时,将`!= nil`优先于`let _ =`(unused_optional_binding)
open override func closeLeft() {
guard let _ = leftViewController else { // If leftViewController is nil, then return
return
}
self.delegate?.leftWillClose?()
leftViewController?.beginAppearanceTransition(isLeftHidden(), animated: true)
closeLeftWithVelocity(0.0)
setCloseWindowLevel()
}
如何解决此警告?