Ios 快速定位

如何将彩色条的位置设置到屏幕底部

我有以下几行：

let ground = SKSpriteNode(color: UIColor(red: 144/255, green: 100/255,
blue: 144/255, alpha: 1.0) , size: CGSize(width: view.frame.size.width, height: 20))
ground.position = ???
addChild(ground)

这应该起作用：

let ground = SKSpriteNode(color: UIColor(red: 144/255, green: 100/255,
        blue: 144/255, alpha: 1.0) , size: CGSize(width: self.size.width, height: 20))
ground.anchorPoint = CGPoint(x: 0, y: 0)
ground.position =  CGPoint(x: 0,y: 0)
addChild(ground)

可能的陷阱：

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如果发生方向更改，则必须重新定位。还要确保场景没有屏幕那么大

尝试以下代码行：

let ground = SKSpriteNode(color: UIColor(red: 144/255, green: 100/255,
blue: 144/255, alpha: 1.0) , size: CGSize(width: view.frame.size.width, height: 20))

view.addSubview(ground)

ground.leftAnchor.constraintEqualToAnchor(view.leftAnchor).active = true
ground.bottomAnchor.constraintEqualToAnchor(view.bottomAnchor).active = true
ground.widthAnchor.constraintEqualToAnchor(view.widthAnchor).active = true
ground.heightAnchor.constraintEqualToConstant(40).active = true

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这取决于设备方向，如果对视图控制器进行了任何修改，则必须使用场景maxY或minY。您的场景与视图的大小不同可能会重复