將EFCircularSlider的值更新爲UILabel

Question

我正在使用名爲EFCircularSlider的庫。這是一個ObjC庫，我已經成功將它導入到我的項目中。但問題是我無法將滑塊值更新爲UILabel。

let sliderFrame = CGRectMake(100, 150, 200, 200) 
let circularSlider = EFCircularSlider(frame: sliderFrame) 

circularSlider.addTarget(self, 
          action:#selector(TemperatureConversion.valueChange(_:)), 
          forControlEvents:UIControlEvents.ValueChanged 
) 

self.view.addSubview(circularSlider) 

func valueChange(sender: EFCircularSlider){ 
    circularSlider.minimumValue = 0 
    circularSlider.maximumValue = 100 
    circularSlider.currentValue = 0 


    upperLabel.text = "\(circularSlider.currentValue)" 

} 

這是它是如何在ObjC完成。我哪裏錯了？

Answer 1

您需要在viewDidLoad方法中添加此行而不是valueChange方法。因此，在viewDidLoad中添加此行，並像這樣更改您的valueChange。

override func viewDidLoad() { 
    super.viewDidLoad() 
    let sliderFrame = CGRectMake(100, 150, 200, 200) 
    let circularSlider = EFCircularSlider(frame: sliderFrame) 
    circularSlider.addTarget(self,action:#selector(TemperatureConversion.valueChange(_:)), 
         forControlEvents:UIControlEvents.ValueChanged) 

    circularSlider.minimumValue = 0 
    circularSlider.maximumValue = 100 
    circularSlider.currentValue = 0 
    self.view.addSubview(circularSlider) 
} 

func valueChange(sender: EFCircularSlider){ 
    upperLabel.text = "\(sender.currentValue)" 
}