以编程方式在 Swift 中设置标签颜色

Question

In (iOS) SWIFT I want to pass the label color via a variable and specifically an array. I calculate a number (my index) and then I want to lookup inside an array which contains the color strings, select a color and pass it on to the UIColor part of the Label definition:

instead of

myLabel.textColor = UIColor.green

// Swift requires explicit definition of color "green"

I want

var Tcolor = ["green", "blue", "red"]
var index: Int = 1

myLabel.text = "myLabel Text"

myLabel.textColor = UIColor.Tcolor[index]

//this should produce the same result as above but programmatically. However, it

returns error with comment "Tcolor is not a UIColor member"...

Is there any other way around?

Answer 1

var Tcolor = [UIColor.green, UIColor.blue, UIColor.red]

See your error Tcolor is not a UIColor member . your Tcolor is string while myLabel.textColor needs UIColor

Answer 2

Create an array of UIColor not strings

var Tcolor : [UIColor] = [UIColor.red, UIColor.blue, UIColor.green]
var index: Int = 1
myLabel.textColor = Tcolor[index]

If you need Sting names for the colors you can do this:

Tcolor : [String : UIColor] = ["Red" : UIColor.red, "Blue" : UIColor.blue, "green" : UIColor.green]

Color by friendly name?

let Tcolor_red = Tcolor["Red"]

OR

myLabel.textColor = Tcolor["Red"]

Answer 3

You can try like this

let colors = [UIColor(red:1.00, green:0.09, blue:0.32, alpha:1.0), UIColor(red:1.00, green:0.80, blue:0.02, alpha:1.0), UIColor(red:0.00, green:0.81, blue:0.62, alpha:1.0), UIColor(red:0.00, green:0.56, blue:0.00, alpha:1.0)]

myLabel.textColor = color[2]