text field 的值輸入時，slider也要隨著值得輸入跟著移動位子

@IBAction func TextToSlider(_ sender: Any){
                redSlider.setValue(Float(RedValue.text), animated: true)
                greenSlider.setValue(Float(GreenValue.text), animated: true)
                blueSlider.setValue(Float(blueValue.text), animated: true)
}

以上就大致完成了
接下來有一些小地方需要修改
1.由於調色盤只能輸入數字來更改顏色，所以在text field 我們要給予限制，只能輸入數字(0~9)
所以char 只能在48~57，否則輸入為0

func textField(_ textField : UITextField,shouldChangeCharactersIn range :NSRange,replacementString string : String) ->Bool{
        let length = string.lengthOfBytes(using: String.Encoding.utf8)
        for loopIndex in 0..<length{
            let char = ( string as NSString).character(at: loopIndex)
            if char < 48{
                textField.text="0"
                return false
            }
            if char > 57{
                textField.text="0"
                return false
            }
        }
        return true
    }

2.還有在設定上要想改變顏色只能輸入(0~255)的值，所以我們要去限制輸入當輸入大於255時，輸入為255，
而小於0或為負數時，輸入為0

@IBAction func TextToSlider(_ sender: Any){
        
        if let RedStringValue = redValue.text{
            if let RedIntValue = Int(RedStringValue){
                if RedIntValue > 255 {
                    redValue.text="\(255)"
                }
                if RedIntValue < 0{
                    redValue.text="\(0)"
                }
                redSlider.setValue(Float(RedIntValue), animated: true)
            }
        }
        if let GreenStringValue = greenValue.text{
            if let GreenIntValue = Int(GreenStringValue){
                if GreenIntValue > 255 {
                    greenValue.text="\(255)"
                }
                if GreenIntValue < 0{
                    greenValue.text="\(0)"
                }
                greenSlider.setValue(Float(GreenIntValue), animated: true)
            }
        }
        if let BlueStringValue = blueValue.text{
            if let BlueIntValue = Int(BlueStringValue){
                if BlueIntValue > 255 {
                    blueValue.text="\(255)"
                }
                if BlueIntValue < 0{
                    blueValue.text="\(0)"
                }
                blueSlider.setValue(Float(BlueIntValue), animated: true)
            }
        }
    }

完成！！！