Create UIView Subclass Without Init() - Swift?

Question

I have a UIView subclass which contains only the following:

drawRect(rect: CGRect) {
    let ctx: CGContext? = UIGraphicsGetCurrentContext()
    let radius: CGFloat = rect.width / 2
    let endAngle = CGFloat(2 * M_PI)
    CGContextAddArc(ctx, bounds.width / 2, bounds.height / 2, radius, 0, endAngle, 1)
    CGContextSetStrokeColorWithColor(ctx, UIColor.blackColor().CGColor)
    CGContextSetFillColorWithColor(ctx, UIColor.whiteColor().CGColor)
    CGContextSetLineWidth(ctx, 4.0)
    CGContextDrawPath(ctx, CGPathDrawingMode.FillStroke)
}

I do not call any init() functions, but the object is still drawn.

Additionally, when I attempt to implement an init() function, I am given several errors regarding required initializations.

So my question is : How am I able to create a UIView object without an init() function?

Sulthan · Accepted Answer · 2016-03-05 22:53:29Z

2

Initializers are inherited. Your superclass (UIView) has init already defined so your class inherits them by default.

Once you define init, your class won't inherit superclass initializers any more so you will have to define all the required ones.

answered Mar 5, 2016 at 22:53

Sulthan

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3 Comments

Brandon Bradley Over a year ago

Just to clarify : If I define what is required, and call super.init() I can override the init() function?

Sulthan Over a year ago

@BrandonBradley Yes, you can. However, for UIView is more common to override init(frame:) which is the designated initializer.

Brandon Bradley Over a year ago

Alright, thanks for the information. Still fairly new to this.

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