如何在Swift中自定义UISlider值

Question

我通过编程创建了UISlider。我尝试定制UISlider值4.1，4.2，4.3，4.4，4.5，5.0，5.1，5.2，5.3，5.4，5.5，6.0，...任何人给我的解决方案

sliderDemo = UISlider(frame:CGRectMake(0, 0, 200,20)) 
    var numberOfSteps : NSInteger = numbers.count - 1 
    sliderDemo.minimumValue = 6.5 
    sliderDemo.maximumValue = 4.1 
    sliderDemo.continuous = true 
    sliderDemo.value = 4.0 
    sliderDemo.addTarget(self, action: "sliderValueDidChange:", forControlEvents: .ValueChanged) 
    self.view.addSubview(sliderDemo) 

func sliderValueDidChange(sender:UISlider!) 
{ 
    println("number:\(sender.value)") 
} 

Answer 1

我只是创建一个自定义滑块的示例，在这种情况下，我正在创建自己并将其添加到表单中，但您可以轻松地使用故事板中的滑块来进行调整，您只需将值添加到数字数组中，结果将位于valueChanged函数中的变量数中，您可以使用观察者，通知或协议在其更改时检索值，或者只需从那里调用函数。

class ViewController: UIViewController { 

    var slider:UISlider? 
    // These number values represent each slider position 
    var numbers = [1, 2, 3, 4, 5, 6, 7] //Add your values here 
    var oldIndex = 0 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     slider = UISlider(frame: self.view.bounds) 
     self.view.addSubview(slider!) 

     // slider values go from 0 to the number of values in your numbers array 
     var numberOfSteps = Float(numbers.count - 1) 
     slider!.maximumValue = numberOfSteps; 
     slider!.minimumValue = 0; 

     // As the slider moves it will continously call the -valueChanged: 
     slider!.continuous = true; // false makes it call only once you let go 
     slider!.addTarget(self, action: "valueChanged:", forControlEvents: .ValueChanged) 
    } 
    func valueChanged(sender: UISlider) { 
     // round the slider position to the nearest index of the numbers array 
     var index = (Int)(slider!.value + 0.5); 
     slider?.setValue(Float(index), animated: false) 
     var number = numbers[index]; // <-- This numeric value you want 
     if oldIndex != index{ 
      println("sliderIndex:\(index)") 
      println("number: \(number)") 
      oldIndex = index 
     } 
    } 
} 

我希望能帮到你！