在Swift中比较UIColors的问题

我需要比较两个UIColors，但由于某种原因它总是返回false。 我尝试使用==和.isEqual()进行比较，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 default: let color = UIColor.clearColor() return color } 

然后，根据我创建的方块的位置，它将检查碰撞，比较我创建的方块的颜色和我在开始时初始化的颜色。

 func checkCollision(currentTime: CFTimeInterval, Square: SKSpriteNode) -> Int{ let color = Square.color print(color.isEqual(blue_color)) print(color.isEqual(red_color)) print(color.isEqual(yellow_color)) if Square.position.y >= 0 && Square.position.y <= 40 { if color.isEqual(blue_color) && (Square.position.x  (basesize.width*2)){ flag = 1 points += 1 } else if color.isEqual(yellow_color) && (Square.position.x  basesize.width) { flag = 1 points += 1 } else { flag = -1 } } 

但color.isEqual(blue_color)或任何其他颜色似乎不起作用。 我打印了Square.color和blue_color （以及其他），它们匹配。 但它总会返回false 。

Answer 1

您可以使用“==”或isEqual。 我刚刚测试了它们，它们工作正常：

 let redColor = UIColor.redColor() let greenColor = UIColor.greenColor() let blueColor = UIColor.blueColor() let testColor = UIColor.greenColor() println( testColor == redColor ) // false println( testColor == greenColor ) // true println( testColor == blueColor ) // false println( testColor.isEqual(redColor) ) // false println( testColor.isEqual(greenColor) ) // true println( testColor.isEqual(blueColor) ) // false 

我刚刚重现了这个问题，只有在提取SKSpriteNode颜色后才会发生，正如你所说的只有分数颜色。 您可以解决此问题，比较颜色描述如下：

 let blue_color = UIColor(red: 122/255, green: 180/255, blue: 190/255, alpha: 1) let yellow_color = UIColor(red: 253/255, green: 213/255, blue: 123/255, alpha: 1) let red_color = UIColor(red: 238/255, green: 116/255, blue: 71/255, alpha: 1) func randomColorController() -> UIColor { let random = arc4random_uniform(3) + 1 switch random { case 1: return blue_color case 2: return red_color case 3: return yellow_color default: return UIColor.clearColor() } } let square = SKSpriteNode(color: randomColorController(), size: CGSize(width: 30, height: 30)) if square.color.description == blue_color.description { println(true) } if square.color.description == red_color.description { println(true) } if square.color.description == yellow_color.description { println(true) } 

Answer 2

 extension UIColor { func isEqual(color: UIColor?) -> Bool { guard let color = color else { return false } var red:CGFloat = 0 var green:CGFloat = 0 var blue:CGFloat = 0 var alpha:CGFloat = 0 self.getRed(&red, green: &green, blue: &blue, alpha: &alpha) var targetRed:CGFloat = 0 var targetGreen:CGFloat = 0 var targetBlue:CGFloat = 0 var targetAlpha:CGFloat = 0 color.getRed(&targetRed, green: &targetGreen, blue: &targetBlue, alpha: &targetAlpha) return (Int(red*255.0) == Int(targetRed*255.0) && Int(green*255.0) == Int(targetGreen*255.0) && Int(blue*255.0) == Int(targetBlue*255.0) && alpha == targetAlpha) } } 

我在swift 3,4中测试过