CODEWITHSUNDEEP
macosnsstringdraw
Christian Krueger
Christian Krueger

Reputation: 139

Draw NSString right justified with NSString.draw(in rect: withAttributes: ) in MacOS?

Cannot draw a String right justified in NSView ( MacOs ) Here is my code, which crashes with :

-[__SwiftValue lineBreakMode]: unrecognized selector sent to instance 0x600003408750

let attrs = [NSAttributedString.Key.foregroundColor:NSColor.white,
                     NSAttributedString.Key.paragraphStyle:NSTextAlignment.right
                    ] as [NSAttributedString.Key : Any]

            let absolutPoint = NSPoint(x: 0.0, y: 0.0)
            var convertedPt  = convertPoint(dataPoint:se,scaleX:scaleX,scaleY:scaleY)
            convertedPt.x    = absolutPoint.x
            
            let scalaLabel = NSString(format:"%3.0f",se.y)

            let place = NSMakeRect(convertedPt.x, convertedPt.y, 80.0, 12.0)
            scalaLabel.draw(in:place ,withAttributes:attrs )

If I do not set paragraphStyle in attrs, text is drawn correctly. But not right-justified. Any idea what´s wrong with my code ?

Upvotes: 0

Views: 89

Answers (1)

Larme
Larme

Reputation: 26096

NSAttributedString.Key.paragraphStyle:NSTextAlignment.right

That's not valid, that's why it's crashing.
The value should be a NSParagraphStyle, not a NSTextAlignment as stated in the documentation:

The value of this attribute is an NSParagraphStyle object. Use this attribute to apply multiple attributes to a range of text. If you do not specify this attribute, the string uses the default paragraph attributes, as returned by the default method of NSParagraphStyle.

let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .right

let attrs = [NSAttributedString.Key.foregroundColor:NSColor.white,
             NSAttributedString.Key.paragraphStyle: paragraphStyle
            ] as [NSAttributedString.Key : Any]

Side note, if you state the type before, it might be shorten:

let attrs: NSAttributedString.Key: Any] = [foregroundColor: NSColor.white,
                                           paragraphStyle: paragraphStyle]

Upvotes: 5

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