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iosswiftuilabellazy-loadingtextcolor

lazy instantiation of `textColor` in `UILabel` throws an error

If I uncomment self.numberLabel.textColor = UIColor.black, the build compiles but crashes in the simulator. 

 lazy public var numberLabel: UILabel = {
        self.numberLabel.textColor = UIColor.black
        return UILabel(frame: CGRect.init(x: 10, y: 40, width: self.bounds.size.width, height: 20))
    }()

The error states: "EXC_BAD_ACCESS".

Solution

  • A lazy stored property is a property whose initial value is not calculated until the first time it is used. You indicate a lazy stored property by writing the lazy modifier before its declaration.

    Sample snippet - Swift 3.x

     lazy public var numberLabel: UILabel = {
    let label = UILabel(frame: CGRect(x: 20, y: 20, width: 200, height: 21))
    label.textColor = UIColor.black
    return label
}()



 override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(numberLabel)
        numberLabel.text = "Good"
}