CODEWITHSUNDEEP
iosobjective-cpropertiesswiftgetter-setter
Isuru
Isuru

Reputation: 31283

Property setters and getters missing in Swift

I'm trying to convert this Objective-C class to Swift.

Below is what I'm done so far.

import UIKit

public class CustomColoredAccessory: UIControl {

    var accessoryColor = UIColor()
    var highlightedColor = UIColor()

    required public init(coder aDecoder: NSCoder!) {
        super.init(coder: aDecoder)
    }

    override init(frame: CGRect) {
        super.init(frame: frame)

        backgroundColor = UIColor.clearColor()
    }

    override public func drawRect(rect: CGRect) {

        let x: CGFloat = CGRectGetMaxX(bounds) - 3
        let y: CGFloat = CGRectGetMaxY(bounds)
        let R: CGFloat = 4.5

        let ctxt = UIGraphicsGetCurrentContext()
        CGContextMoveToPoint(ctxt, x - R, y - R)
        CGContextAddLineToPoint(ctxt, x, y)
        CGContextAddLineToPoint(ctxt, x - R, y + R)
        CGContextSetLineCap(ctxt, kCGLineCapSquare)
        CGContextSetLineJoin(ctxt, kCGLineJoinMiter)
        CGContextSetLineWidth(ctxt, 3)

        if highlighted == true {
            highlightedColor.setStroke()
        } else {
            accessoryColor.setStroke()
        }
        CGContextStrokePath(ctxt)
    }

    public class func accessoryWithColor(color: UIColor) -> CustomColoredAccessory {
        var ret = CustomColoredAccessory(frame: CGRectMake(0, 0, 11, 15))
        ret.accessoryColor = color

        return ret
    }
}

In the origin Objective-C code, there's one setter and two getters for the two properties.

- (void)setHighlighted:(BOOL)highlighted {

    [super setHighlighted:highlighted];
    [self setNeedsDisplay];
}

- (UIColor *)accessoryColor {
    if (!_accessoryColor) {
        return [UIColor blackColor];
    }

    return _accessoryColor;
}

- (UIColor *)highlightedColor {
    if (!_highlightedColor) {
        return [UIColor whiteColor];
    }
    return _highlightedColor;
}

I noticed that property setters and getters are gone i Swift. At least a little different.

I tried adding the setter to highlightedColor like this,

var highlightedColor = UIColor() {
    set {
        setNeedsDisplay()
    }
}

But I get this error at the set line - Use of unresolved identifier 'set'

Can someone please tell me how to correct this error? I can't figure it out.

Thank you.

Upvotes: 3

Views: 3866

Answers (1)

Zalykr
Zalykr

Reputation: 1524

The setter and getter are both placed in the variable declaration:

var highlightedColor: UIColor {
    set {
        //custom setter
    }
    get {
        //custom getter
    }
}

You would also need to include the get. Anyway, if you want to call setNeedsDisplay() you would be better off by using a "property observer" like so:

var highlightedColor: UIColor {
    didSet {
        setNeedsDisplay()
    }
}

For more info take a look at Swift Properties

Upvotes: 6

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