在 Swift 中自动移动 UISlider [英] Move UISlider automatically in Swift

问题描述

我想在您点击按钮时将 UISlider 从 minValue 循环移动到 maxValue 并在再次点击按钮时将其停在当前位置，我想使用 Swift.

I want to move a UISlider from minValue to maxValue in a loop when you hit a button and stop it at the current position when hitting the button again, I want to use Swift.

我遇到的主要问题是函数 slider.setValue() 太快了，我希望动画更慢.

The main problem i got is that the function slider.setValue() is way to fast, I want the animation more slowly.

@IBAction func setSliderValue(_ sender: UIButton){
        slider.setValue(100, animated: true)
        print("The value of the slider is now \(slider.value)")
        sliderValue = Int(slider.value)
}

推荐答案

您可以使用时间自动移动滑块.在全局范围内创建 NSTimer 变量:同时在全局范围内创建一个 Bool 变量，用于检查是否需要修改.

You can use time to Automatically Move slider. Create NSTimer variable in global scope: Also create one Bool variable in global scope for checking if Need to revise it.

var  mytimer : NSTimer?
var  reversing : Bool?

当你想要动画时启动计时器:

start timer when you want to animate it:

reversing = NO;
mytimer =  NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: #selector(timerAction), userInfo: nil, repeats: true)

在 tImer Action 上，您可以编写代码来更改 Slider 的值:

On tImer Action, You can write code to change value of Slider:

var sliderrange =  slider.maxValue - slider.minValue;
var increment = sliderrange/100;
var newval = slider.value;

newel = reversing ? (slider.value - increment) : (slider.value + increment);

if(newval >= slider.maxValue)
{
  reversing = true;
   newval = newval - 2*increment;

}
else  if(newel <= 0)
{
  reversing = false;
}
 slider.setValue(newval, animated: true)

在按钮操作上，您可以停止计时器，

On Button Action, You can just stop the timer,

 if mytimer != nil {
    mytimer!.invalidate()
    mytimer = nil
  }

这篇关于在 Swift 中自动移动 UISlider的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！