How to make this more elegant?

gistfile1.swift

    // Variant 1: looks inelegant
    
    override internal func drawRect(rect: CGRect)
    {
        let context = UIGraphicsGetCurrentContext()
        let size = bounds.size
        
        if let gradient = gradient
        {
            let options = CGGradientDrawingOptions(kCGGradientDrawsAfterEndLocation)
            
            var center = gradientStartPoint
            
            if center == nil
            {
                center = CGPoint(x: bounds.midX, y: bounds.midY)
            }
            
            CGContextDrawRadialGradient(context, gradient, center!, 0, center!, min(size.width, size.height) / 2, options)
        }
    }
    
    // Variant 2: bad because the CGContextDrawRadialGradient appears twice
    
    override internal func drawRect(rect: CGRect)
    {
        let context = UIGraphicsGetCurrentContext()
        let size = bounds.size
        
        // Gradient
        if let gradient = gradient
        {
            let options = CGGradientDrawingOptions(kCGGradientDrawsAfterEndLocation)
            
            if let center = gradientStartPoint
            {
                CGContextDrawRadialGradient(context, gradient, center, 0, center, min(size.width, size.height) / 2, options)
            }
            else
            {
                let center = CGPoint(x: bounds.midX, y: bounds.midY)
                CGContextDrawRadialGradient(context, gradient, center, 0, center, min(size.width, size.height) / 2, options)
            }
        }
    }

You should be able to use the nil coalescing operator (??) to clean up that assignment to center, and then not have to force unwrap it:

let center = gradientStartPoint ?? CGPoint(x: bounds.midX, y: bounds.midY)

Which cleans up the method nicely:

override internal func drawRect(rect: CGRect)
{
    let context = UIGraphicsGetCurrentContext()
    let size = bounds.size

    if let gradient = gradient
    {
        let options = CGGradientDrawingOptions(kCGGradientDrawsAfterEndLocation)
        let center = gradientStartPoint ?? CGPoint(x: bounds.midX, y: bounds.midY)

        CGContextDrawRadialGradient(context, gradient, center, 0, center, min(size.width, size.height) / 2, options)
    }
}