Question

如何用swift完成这个类似的代码。但是，当我尝试使用swift完成时，它会在调用

中给出错误额外参数green

+(UIColor *)colorWithValues:(NSString *)colorValues{
NSArray *colorComponents = [colorValues componentsSeparatedByString:@","];

CGFloat red = [[colorComponents objectAtIndex:0] floatValue]/255.0;
CGFloat green = [[colorComponents objectAtIndex:1] floatValue]/255.0;
CGFloat blue = [[colorComponents objectAtIndex:2] floatValue]/255.0;
CGFloat alpha = [[colorComponents objectAtIndex:3] floatValue];
UIColor *color = [[UIColor alloc]initWithRed:red 
                                       green:green 
                                        blue:blue 
                                       alpha:alpha];
//UIColor *color = [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
return color;
}

bgView.backgoroundColor = [[self class]colorWithValues:@"155,124,144,1"];

    func colorWithValues(#colorToString : String) -> (UIColor) {

    var colorString = colorToString.componentsSeparatedByString(",")
    let redColor : Float = Float(colorString[0].toInt()!)/255.0
    let greenColor : Float = Float(colorString[1].toInt()!)/255.0
    let blueColor: Float = Float(colorString[2].toInt()!)/255.0
    let colorAlpha: Float = Float(colorString[3].toInt()!)

    var colorValue : UIColor! = UIColor(red:CGFloat(redColor), green:CGFloat(greenColor), blue:CGFloat(blueColor), alpha: colorAlpha)
    return colorValue
}

Answer 1

我可以看到你忘了在alpha

中包裹CGFloat

var colorValue : UIColor! = UIColor(red:CGFloat(redColor), green:CGFloat(greenColor), 
blue:CGFloat(blueColor), alpha: colorAlpha)
                                ^^^^^^^^^^ here

导致问题，将其更改为

var colorValue : UIColor! = UIColor(red: CGFloat(redColor), green: CGFloat(greenColor), 
blue: CGFloat(blueColor), alpha: CGFloat(colorAlpha))

Answer 2

您应该将Float值更改为CGFloat：

let redColor : CGFloat = CGFloat(colorString[0].toInt()!)/255.0
let greenColor : CGFloat = CGFloat(colorString[1].toInt()!)/255.0
let blueColor: CGFloat = CGFloat(colorString[2].toInt()!)/255.0
let colorAlpha: CGFloat = CGFloat(colorString[3].toInt()!)

这样您就可以传递值而无需转换它们，这可以防止忘记将alpha值转换为CGFloat等问题。

使用swift时，额外参数绿色调用

2 个答案: