ios - 错误 : Cannot change background color of button

Question

当我点击一个按钮时，我会弹出一个按钮面板，按钮上有一个颜色的名称。当我单击该颜色时，下面的代码应将我的两个按钮更改为所选颜色，但现在我选择它时，它会打印 sender.currentTitle 的颜色，如 Optional("Red") .

除了当我点击按钮时，按钮的颜色没有改变。事实上，当我点击“红色”时，我调用的下方红色区域中的打印函数并未打印，因此未调用该函数。

当我点击其中一种颜色时我的代码:

@IBAction func button1ActualColorChosen(sender: AnyObject) {
    var coliString1 = "\(sender.currentTitle!)"
    print("\(coliString1)")
    if coliString1 == "Black"{
    Button1C.backgroundColor = UIColor.blackColor()
    button1Bang.backgroundColor = UIColor.blackColor()
    }
    if coliString1 == "Red"{
        print("red")
        Button1C.backgroundColor = UIColor.redColor()
        button1Bang.backgroundColor = UIColor.redColor()
    }
    if coliString1 == "Green"{
        Button1C.backgroundColor = UIColor.greenColor()
        button1Bang.backgroundColor = UIColor.greenColor()
    }
    if coliString1 == "Orange"{
        Button1C.backgroundColor = UIColor.orangeColor()
        button1Bang.backgroundColor = UIColor.orangeColor()
    }
    if coliString1 == "Blue"{
        Button1C.backgroundColor = UIColor.blueColor()
        button1Bang.backgroundColor = UIColor.blueColor()
    }
    if coliString1 == "Cyan"{
        Button1C.backgroundColor = UIColor.cyanColor()
        button1Bang.backgroundColor = UIColor.cyanColor()
    }
    if coliString1 == "Brown"{
        Button1C.backgroundColor = UIColor.brownColor()
        button1Bang.backgroundColor = UIColor.brownColor()
    }
    if coliString1 == "Gray"{
        Button1C.backgroundColor = UIColor.grayColor()
        button1Bang.backgroundColor = UIColor.grayColor()
    }
    if coliString1 == "Purple"{
        Button1C.backgroundColor = UIColor.purpleColor()
        button1Bang.backgroundColor = UIColor.purpleColor()
    }
    if coliString1 == "Magenta"{
        Button1C.backgroundColor = UIColor.magentaColor()
        button1Bang.backgroundColor = UIColor.magentaColor()
    }
    Button1C.alpha = 1
}

如您所见，我将颜色分开，因为我不知道如何不这样做。我怎样才能调用说 if coliString1 == "Red"{}" 的函数？等

Answer 1

线路至少有一个问题

var coliString1 = "\(sender.currentTitle!)"

自 sender.currentTitle!返回一个字符串，您不需要使用字符串插值将其分配给变量 coliString1。此外，使用 switch 语句可以帮助清理一些东西。

@IBAction func button1ActualColorChosen(sender: AnyObject) {
    let button = sender as! UIButton
    let coliString1 = button.currentTitle

    var newColor = UIColor()

    if let cs1 = coliString {
        switch cs1 {
            case "Black":
                newColor = UIColor.blackColor()
            case "Red":
                newColor = UIColor.redColor()
            case "Green":
                newColor = UIColor.greenColor()
            case "Orange":
                newColor = UIColor.orangeColor()
            case "Blue":
                newColor = UIColor.blueColor()
            case "Cyan":
                newColor = UIColor.cyanColor()
            case "Brown":
                newColor = UIColor.brownColor()
            case "Gray":
                newColor = UIColor.grayColor()
            case "Purple":
                newColor = UIColor.purpleColor()
            case "Magenta":
                newColor = UIColor.magentaColor()
            default:
                newColor = UIColor.clearColor()
        }
     }

     Button1C.backgroundColor = newColor
     button1Bang.backgroundColor = newColor

     Button1C.alpha = 1
}