如何在 Swift 中设置 UILabel 的 textColor

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Made an app with two labels in IB and the following:

@IBOutlet var label1: UILabel!
@IBOutlet var label2: UILabel!


override func viewDidLoad() {
super.viewDidLoad()
label1.textColor = UIColor.redColor() // in Swift 3 it's UIColor.red
label2.textColor = label1.textColor
}

label2 color changed as expected, so your line works. Try println(otherLabel.textColor) right before you set myLabel.textColor to see if the color's what you expect.

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This code example that follows shows a basic UILabel configuration.

let lbl = UILabel(frame: CGRectMake(0, 0, 300, 200))
lbl.text = "yourString"


// Enum type, two variations:
lbl.textAlignment = NSTextAlignment.Right
lbl.textAlignment = .Right


lbl.textColor = UIColor.red
lbl.shadowColor = UIColor.black
lbl.font = UIFont(name: "HelveticaNeue", size: CGFloat(22))
self.view.addSubview(lbl)

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最佳答案

The easiest workaround is create dummy labels in IB, give them the text the color you like and set to hidden. You can then reference this color in your code to set your label to the desired color.

yourLabel.textColor = hiddenLabel.textColor

The only way I could change the text color programmatically was by using the standard colors, UIColor.white, UIColor.green...

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I don't know why but to change the text color of the labels you need to divide the value you want with 255, because it works only until 1.0.

For example a dark blue color:

label.textColor = UIColor(red: 0.0, green: 0.004, blue: 0.502, alpha: 1.0)

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I think most people want their placeholder text to be in grey and appear only once, so this is what I did:

Set your color in viewDidLoad() (not in IB)

commentsTextView.textColor = UIColor.darkGray

Implement UITextViewDelegate to your controller

add function to your controller

func textViewDidBeginEditing(_ textView: UITextView) {
if (commentsTextView.textColor == UIColor.darkGray) {
commentsTextView.text = ""
commentsTextView.textColor = UIColor.black
}
}

This solution is simple.

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The text field placeholder and the "is really" label is hard to see at night. So i change their color depending one what time of day it is.

Also make sure you connect the new IBOutlet isReallyLabel. To do so open Main.storybaord and control-drag from "Convert" view controller to the "is really" text field and select the isReallyLabel under Outlets.

WARNING: I have not tested to see if the application is open while the time of day swaps.

@IBOutlet var isReallyLabel: UILabel!
  

override func viewWillAppear(animated: Bool) {
let calendar = NSCalendar.currentCalendar()
let hour = calendar.component(.Hour, fromDate: NSDate())
		

let lightColor = UIColor.init(red: 0.961, green: 0.957, blue: 0945, alpha: 1)
let darkColor = UIColor.init(red: 0.184, green: 0.184	, blue: 0.188, alpha: 1)


		

switch hour {
case 8...18:
isReallyLabel.textColor = UIColor.blackColor()
view.backgroundColor = lightColor
default:
let string = NSAttributedString(string: "Value", attributes: [NSForegroundColorAttributeName: UIColor.whiteColor()])
textField.attributedPlaceholder = string
isReallyLabel.textColor = UIColor.whiteColor()
view.backgroundColor = darkColor
}
}

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If you are using Xcode 8 and swift 3. Use the following way to get the UIColor

label1.textColor = UIColor.red
label2.textColor = UIColor.black

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solution for swift 3 -

let titleLabel = UILabel(frame: CGRect(x: 0, y: 0, width: 40, height: 40))
titleLabel.text = "change to red color"
titleLabel.textAlignment = .center
titleLabel.textColor = UIColor.red

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To change the text colour of UILable at runtime use NSAttributedText and do not set UILable.textColor.

let font = UIFont(name: "SFProText-Semibold", size: 16)!
if let messageToDisplay = currentUser?.lastMessage {


let attributedString = NSAttributedString(string: messageToDisplay, attributes: [NSAttributedString.Key.font: font, NSAttributedString.Key.foregroundColor: UIColor(named: "charcoal")!])
lastMessageLabel.attributedText = attributedString
} else {
let attributedString = NSAttributedString(string: "Start a conversation", attributes: [NSAttributedString.Key.font: font, NSAttributedString.Key.foregroundColor: UIColor(named: "ocean")!])
lastMessageLabel.attributedText = attributedString
}

Note charcoal and ocean are colours defined in Assets.xcassets. Resultant Label Images:

Above code worked well for me in Xcode 10.2.1 and Swift 5.

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You can use as below and also can use various color just assign

myLabel.textColor = UIColor.yourChoiceOfColor

Ex:

Swift

myLabel.textColor = UIColor.red

Objective-C

[myLabel setTextColor:[UIColor redColor]];

or you can click here to Choose the color,

https://www.ralfebert.de/ios-examples/uikit/swift-uicolor-picker/