小编Car*_*oni的帖子

我需要比较两个UIColors,但由于某种原因它总是返回false.我尝试比较使用==和.isEqual(),但它们似乎都不起作用.

//This is a sample of the colors I have created
let blue_color = UIColor(red: 122/255, green: 180/255, blue: 190/255, alpha: 1)


//This is the SpriteNode I have to compare

let square = SKSpriteNode(color: randomColorController(), size: ksquaresize)

randomColorController()只是一个随机化颜色并返回它的函数,因此在创建square时会调用它.

func randomColorController() -> UIColor {
    let random = arc4random_uniform(3) + 1

    switch random {
    case 1:
        let color = blue_color
        return color
    case 2:
        let color = yellow_color
        return color
    case 3:
        let color = yellow_color
        return color …

我正在尝试为 2 个约束中的优先级更改设置动画，但我似乎无法使其工作。我的动画代码如下：

        UIView.animate(withDuration: 0.2, animations: {
        if self.cardHeaderBottomtoBodyTopConstraint.priority == UILayoutPriorityDefaultHigh {
            self.cardHeaderBottomtoBodyTopConstraint.priority = UILayoutPriorityDefaultLow
            self.cardHeaderBottomToBodyBottomConstraint.priority = UILayoutPriorityDefaultHigh
        } else {
            self.cardHeaderBottomtoBodyTopConstraint.priority = UILayoutPriorityDefaultHigh
            self.cardHeaderBottomToBodyBottomConstraint.priority = UILayoutPriorityDefaultLow
        }

        self.flightInformationBodyCard.layoutIfNeeded()
        self.flightInformationBodyCard.updateConstraints()
    }, completion: nil)

我正在制作一个游戏，我需要将我的对象复制到特定图像的区域内。我不想需要我的表面来传输这些图像。是否可以？（我使用的是pygame）