如何通过按一下按钮将 UISlider 缓慢地向左或向右移动？

Question

我有这两个按钮，如果我按下左边的按钮，我希望滑块一直向左缓慢移动，当我按下右边的按钮将滑块全部移动时，也是如此右边的路。我现在拥有的代码非常快速地移动滑块，我希望它是逐渐移动的。

override func didMoveToView(view: SKView) {

        middleSlider = UISlider(frame: CGRectMake(self.view!.bounds.width/2 - 150/2, self.view!.bounds.height/2 * 1.7, 150, 50))
        middleSlider.tintColor = UIColor.whiteColor()
        middleSlider.minimumTrackTintColor = UIColor.whiteColor()
        middleSlider.maximumTrackTintColor = UIColor.whiteColor()
        middleSlider.setThumbImage(UIImage(named: "mixerb1"), forState: UIControlState.Normal)
        middleSlider.maximumValue = 2.0
        middleSlider.minimumValue =  0.0
        middleSlider.value = 1.0
        middleSlider.continuous = true
        middleSlider.userInteractionEnabled = true
        middleSlider.addTarget(self, action: #selector(middleSliderChangeAudio), forControlEvents: UIControlEvents.AllEvents)
        self.view?.addSubview(middleSlider)

}


override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        let location = touch.locationInNode(self)
        let node = self.nodeAtPoint(location)


        if node.name == "left" {
        print("slider moves to left")

        UIView.animateWithDuration(10.0, animations: {
            self.middleSlider.value = self.middleSlider.minimumValue
            self.middleSlider.continuous = true
      }
   )
}


    if node.name == "right" {
    print("slider moves to right")

        UIView.animateWithDuration(10.0, animations: {
            self.middleSlider.value = self.middleSlider.maximumValue
            self.middleSlider.continuous = true
            }
        )
    }
}

Answer 1

在此处使用 setValue(_:animated:) 方法Documentation。让我们知道进展如何。

一旦你添加了它，将它包裹在你的动画中，持续时间如下。请注意，10 秒只是一个硬编码值，将持续时间更改为您想要的任何值，同样适用于您想要设置的值。

@IBAction func moveSlider(sender: UIButton) {
    UIView.animateWithDuration(10, animations: {
        self.slider.setValue(1.0, animated: true)
    })


}

当您使用它时，向上滚动一点以查看属性值的文档。这样您就可以更好地了解正在发生的事情。

如何通过按一下按钮将 UISlider 缓慢地向左或向右移动？

How do I slowly move my UISlider to the left or right with a touch of a button?

uislider

ios

swift