import UIKit
class ViewController: UIViewController {
@IBOutlet weak var squareButton: UIButton!
var red = CGFloat(255)
var green = CGFloat(255)
var blue = CGFloat(255)
var alpha = CGFloat(1)
override func viewDidLoad() {
super.viewDidLoad()
squareButton.layer.cornerRadius = 100
}
@IBAction func sliderR(sender: UISlider) {
red = CGFloat(lroundf(sender.value))
squareButton.backgroundColor = UIColor(red: red/255, green: green/255, blue: blue/255, alpha: alpha/1)
}
@IBAction func sliderG(sender: UISlider) {
green = CGFloat(lroundf(sender.value))
squareButton.backgroundColor = UIColor(red: red/255, green: green/255, blue: blue/255, alpha: alpha/1)
}
@IBAction func sliderB(sender: UISlider) {
blue = CGFloat(lroundf(sender.value))
squareButton.backgroundColor = UIColor(red: red/255, green: green/255, blue: blue/255, alpha: alpha/1)
}
@IBAction func sliderAlpha(sender: UISlider) {
alpha = CGFloat(sender.value)
squareButton.backgroundColor = UIColor(red: red/255, green: green/255, blue: blue/255, alpha: alpha/1)
}
@IBAction func squareButton(sender: UIButton) {
squareButton.backgroundColor = UIColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
red = CGFloat(255)
green = CGFloat(255)
blue = CGFloat(255)
alpha = CGFloat(1)
}
}
因此,我正在练习使用四个
UISlider
来控制按钮的背景RGB颜色和不透明度(1.R / 2.G / 3.B / 4.alpha)。我试图将确切的按钮设为重置按钮。我确实设法更改了按钮的背景色和不透明度,并且在单击“重置”按钮时,背景色也变回了白色。但是,当一切恢复到初始状态时,滑块的拇指仍停留在原处。
当我按下复位键时,应该怎么做才能使拇指回到初始位置?
另外,如果有任何错误或可以做得更好的任何事情,请告诉我。我对Swift非常陌生,渴望学习。谢谢!
最佳答案
为滑块创建IBOutlet,并将其连接到情节提要中。
按下复位按钮后,将滑块的值设置为原始值。
redSlider.value = 1;
关于ios - 将UISlider拇指重置为初始位置,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/32316826/