CODEWITHSUNDEEP
macosswift3xcode8
Attilio Piccolo
Attilio Piccolo

Reputation: 1

Mathematical (Greek) Symbols in Swift bug?

Today I find a big problem for my application in swift 3: all greek letter (as picture) don't appear in the app storyboard and layout; all other emoji and special character work.

It's a Swift bug? I need of this characters for my Math application.

Math Symbols

Upvotes: 0

Views: 6848

Answers (1)

OOPer
OOPer

Reputation: 47896

I have checked the three characters in your comment (such info needs to be in your question, not in comment), and they all are non-BMP characters in the Mathematical Alphanumeric Symbols code block.

"𝛌" //MATHEMATICAL BOLD SMALL LAMDA   U+1D6CC
"𝛗" //MATHEMATICAL BOLD SMALL PHI     U+1D6D7
"𝛿" //MATHEMATICAL ITALIC SMALL DELTA U+1D6FF

iOS

As far as I tested, all fonts installed in iOS 10 simulator does not have mapped glyphs for these characters.

You may need to:

  • install your own font supporting these characters within your app

or

  • convert these characters into NSAttribtedString utilizing usual greek letters

This is a small code snippet you can test in the Playground of iOS:

(λ, φ and δ are just simple Greek letters, U+03BB, U+03C6 and U+03B4.)

import UIKit

var maStr = NSMutableAttributedString()
let boldFont = UIFont(name: "Times-Bold", size: 18.0)!
maStr.append(NSAttributedString(string: "λ φ", attributes: [NSFontAttributeName: boldFont]))
let italicFont = UIFont(name: "Times-Italic", size: 18.0)!
maStr.append(NSAttributedString(string: " δ", attributes: [NSFontAttributeName: italicFont]))
maStr

enter image description here

If this cannot fulfil your requirement, you need to update your question and explain your requirement precisely.

macOS (OS X)

In my OS X El Capitan (10.11.5) -- sorry not yet Sierra -- , I have found two fonts (in the same font family) which can show such characters.

STIXGeneral-Bold

STIXGeneral-Regular

So in a usual text system which can choose alternative font, such mathematical symbols can be shown.

For example, you can test in the Playground for macOS:

import Cocoa

var str = "Hello, playground"

let label = NSTextField(frame: CGRect(x:0, y:0, width: 320, height: 100))
label.stringValue = "𝛌 𝛗 𝛿"

And the storyboard editor of Xcode 8.2.1 actually shows these characters.

Upvotes: 1

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