NSFontDescriptor.withSymbolicTraits更改我的字体名称

Question

正如您在图片中看到的那样，字体的名称是＆＃34; Helvetica＆＃34;在开始时，我调用font.fontDescriptor.withSymbolicTraits:来创建字体描述符，然后使用描述符创建一个newFont。但新字体的名称变为Arial-ItalicMT。怎么会发生？感谢。

Answer 1

TL; DR: adding SELECT * FROM `users` where Number IN ('1212','0921'); will get you the expected result:

inputChangeHandler: function ({ target: { id, value }) {
    this.setState({ [id]: value });
},

---

The long answer:

An withFamily() is like filtering criteria for fonts. Based on how you configure this object, the system will find matching fonts. Let's examine the descriptor of your first font:

let font = NSFont(name: "Helvetica", size: 18)!

let descriptor = font.fontDescriptor.withFamily(font.familyName!).withSymbolicTraits(.italic)
let newFont    = NSFont(descriptor: descriptor, size: 18)!

print(font.fontName)    // Helvetica
print(newFont.fontName) // Helvetica-Oblique

A font with name of Helvetica and size 18. So far so good. Now, let's check your second descriptor:

NSFontDescriptor

There's no mention of Helvetica anywhere! If you initialize an let font = NSFont(name: "Helvetica", size: 18)! print(font.fontDescriptor) /* NSCTFontDescriptor <0x1016168d0> = { NSFontNameAttribute = Helvetica; NSFontSizeAttribute = 18; } */ with this descriptor, the OS wil find the first available italic font on your computer, which is let descriptor = font.fontDescriptor.withSymbolicTraits(.italic) print(descriptor) /* NSCTFontDescriptor <0x10161b0e0> = { NSCTFontTraitsAttribute = { NSCTFontSymbolicTrait = 1; }; NSFontSizeAttribute = 18; } */ . You can check by openning Font Book.

You need to specify that you are looking for an italic font in the Helvetica family:

NSFont

To make it more generic, you can replace the string Arial-ItalicMT with the let descriptor = font.fontDescriptor.withSymbolicTraits(.italic).withFamily("Helvetica") print(descriptor) /* NSCTFontDescriptor <0x10113baa0> = { NSCTFontTraitsAttribute = { NSCTFontSymbolicTrait = 1; }; NSFontFamilyAttribute = Helvetica; NSFontSizeAttribute = 18; } */ let newFont = NSFont(descriptor: descriptor, size: 18)! // Helvetica-Oblique of the first "Helvetica" object.

Answer 2

实例方法。withSymbolicTraits返回一个新的字体描述符，该描述符与接收者相同，但具有指定的符号特征，优先于现有的优先级。 Source

从我的理解。排名中的第一个字体将基于fonts included with macOS Sierra返回。

在您的情况下，.italic将返回Arial-ItalicMT或.bold返回AlBayan-Bold