swift - 来自字符串的 setTorchModeOnWithLevel

Question

我的变量:

var torchLevel : Float = 0.0

我的切换功能:

func toggleFlash() {
        let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
        if (device.hasTorch){
            device.lockForConfiguration(nil)
            if (device.torchMode == AVCaptureTorchMode.On)
            {
                device.torchMode = AVCaptureTorchMode.Off
                isTorchOn = 0
            }
            else
            {
                device.setTorchModeOnWithLevel(torchLevel, error: nil)
                isTorchOn = 1
            }
            device.unlockForConfiguration()
        }
    }

更改 slider :

@IBAction func brightnessSliderAction(sender: UISlider) {
        var currentBrightnessValue = Int(sender.value)
        torchLevel = currentBrightnessValue
        valueLabel.text = "\(torchLevel)"
    }

代码错误:

torchLevel = currentBrightnessValue

错误信息:

Cannot assign a value of type "int" to a value of type "Float"

Answer 1

您需要将 torchLevel 转换为 Float。

或者让它像这样显式 float :

var torchLevel : Float = 0.0