ios 如何在 iPhone/iPad 的 UILabel 上设置粗斜体？
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How do I set bold and italic on UILabel of iPhone/iPad?
提问by Edi
How do I set bold and italic on UILabelof iPhone/iPad?
I searched the forum but nothing helped me. Could anyone help me?
如何在UILabeliPhone/iPad上设置粗体和斜体？我搜索了论坛，但没有任何帮助。有人可以帮助我吗？
采纳答案by Mobile Developer iOS Android
回答by Maksymilian Wojakowski
Don't try to play with the font names. Using the font descriptor you need no names:
不要尝试使用字体名称。使用字体描述符不需要名称：
UILabel * label = [[UILabel alloc] init]; // use your label object instead of this
UIFontDescriptor * fontD = [label.font.fontDescriptor
fontDescriptorWithSymbolicTraits:UIFontDescriptorTraitBold
| UIFontDescriptorTraitItalic];
label.font = [UIFont fontWithDescriptor:fontD size:0];
size:0means 'keep the size as is'
size:0意思是“保持原样”
With Swift try the following extension:
使用 Swift 尝试以下扩展：
extension UIFont {
func withTraits(traits:UIFontDescriptorSymbolicTraits...) -> UIFont {
let descriptor = self.fontDescriptor()
.fontDescriptorWithSymbolicTraits(UIFontDescriptorSymbolicTraits(traits))
return UIFont(descriptor: descriptor, size: 0)
}
func boldItalic() -> UIFont {
return withTraits(.TraitBold, .TraitItalic)
}
}
Then you may use it this way:
那么你可以这样使用它：
myLabel.font = myLabel.font.boldItalic()
or even add additional traits like Condensed:
甚至添加额外的特征，如 Condensed：
myLabel.font = myLabel.font.withTraits(.TraitCondensed, .TraitBold, .TraitItalic)
Update for Swift 4:
Swift 4 更新：
extension UIFont {
var bold: UIFont {
return with(traits: .traitBold)
} // bold
var italic: UIFont {
return with(traits: .traitItalic)
} // italic
var boldItalic: UIFont {
return with(traits: [.traitBold, .traitItalic])
} // boldItalic
func with(traits: UIFontDescriptorSymbolicTraits) -> UIFont {
guard let descriptor = self.fontDescriptor.withSymbolicTraits(traits) else {
return self
} // guard
return UIFont(descriptor: descriptor, size: 0)
} // with(traits:)
} // extension
Use it as follows:
使用方法如下：
myLabel.font = myLabel.font.bold
myLabel.font = myLabel.font.bold
or
或者
myLabel.font = myLabel.font.italic
myLabel.font = myLabel.font.italic
or
或者
myLabel.font = myLabel.font.with(traits: [ .traitBold, .traitCondensed ])
myLabel.font = myLabel.font.with(traits: [ .traitBold, .traitCondensed ])
Update for Swift 5
Swift 5 更新
extension UIFont {
var bold: UIFont {
return with(.traitBold)
}
var italic: UIFont {
return with(.traitItalic)
}
var boldItalic: UIFont {
return with([.traitBold, .traitItalic])
}
func with(_ traits: UIFontDescriptor.SymbolicTraits...) -> UIFont {
guard let descriptor = self.fontDescriptor.withSymbolicTraits(UIFontDescriptor.SymbolicTraits(traits).union(self.fontDescriptor.symbolicTraits)) else {
return self
}
return UIFont(descriptor: descriptor, size: 0)
}
func without(_ traits: UIFontDescriptor.SymbolicTraits...) -> UIFont {
guard let descriptor = self.fontDescriptor.withSymbolicTraits(self.fontDescriptor.symbolicTraits.subtracting(UIFontDescriptor.SymbolicTraits(traits))) else {
return self
}
return UIFont(descriptor: descriptor, size: 0)
}
}
回答by Sudhanshu
@Edinator have a look on this..
@Edinator 看看这个..
myLabel.font = [UIFont boldSystemFontOfSize:16.0f]
myLabel.font = [UIFont italicSystemFontOfSize:16.0f];
use any one of the above at a time you want
一次使用上述任何一种
回答by ViliusK
You can set any font style, family, size for the label, by clicking on letter "T" in Fontfield.
您可以通过单击字体字段中的字母“T”来设置标签的任何字体样式、系列、大小。
回答by Even Cheng
I have the same issue that need to apply both Bold and Italic on a label and button. You can simply use following code to achieve this effect:
我有同样的问题，需要在标签和按钮上同时应用粗体和斜体。您可以简单地使用以下代码来实现此效果：
myLabel.font = [UIFont fontWithName:@"Arial-BoldItalic" size:30.0];
回答by John Riselvato
With iOS 7 system default font, you'll be using helvetica neue bold if you are looking to keep system default font.
使用 iOS 7 系统默认字体，如果您希望保留系统默认字体，您将使用 helvetica neue 粗体。
[titleText setFont:[UIFont fontWithName:@"HelveticaNeue-Bold" size:16.0]];
Or you can simply call it:
或者你可以简单地调用它：
[titleText setFont:[UIFont boldSystemFontOfSize:16.0]];
回答by Vyacheslav
Swift 3
斯威夫特 3
Bold:
胆大：
let bondFont = UIFont.boldSystemFont(ofSize:UIFont.labelFontSize)
let bondFont = UIFont.boldSystemFont(ofSize:UIFont.labelFontSize)
Italic:
斜体：
let italicFont = UIFont.italicSystemFont(ofSize:UIFont.labelFontSize)
let italicFont = UIFont.italicSystemFont(ofSize:UIFont.labelFontSize)
回答by tolbard
I made a variation of the response of maksymilian wojakowski where you can add or remove a trait(s)
我对 maksymilian wojakowski 的反应做了一个变体，你可以在其中添加或删除特征
extension UIFont {
func withTraits(_ traits:UIFontDescriptorSymbolicTraits...) -> UIFont {
let descriptor = self.fontDescriptor
.withSymbolicTraits(UIFontDescriptorSymbolicTraits(traits).union(self.fontDescriptor.symbolicTraits))
return UIFont(descriptor: descriptor!, size: 0)
}
func withoutTraits(_ traits:UIFontDescriptorSymbolicTraits...) -> UIFont {
let descriptor = self.fontDescriptor
.withSymbolicTraits( self.fontDescriptor.symbolicTraits.subtracting(UIFontDescriptorSymbolicTraits(traits)))
return UIFont(descriptor: descriptor!, size: 0)
}
func bold() -> UIFont {
return withTraits( .traitBold)
}
func italic() -> UIFont {
return withTraits(.traitItalic)
}
func noItalic() -> UIFont {
return withoutTraits(.traitItalic)
}
func noBold() -> UIFont {
return withoutTraits(.traitBold)
}
}
exemple
例子
label.font = label.font.italic().bold()
it useful when reusing cell and you want to remove the italic you put on a label in a previous cell
当重用单元格并且您想删除您放在前一个单元格中的标签上的斜体时它很有用
回答by jayesh kavathiya
btn.titleLabel.font=[UIFont fontWithName:@"Helvetica neue" size:10];
btn.titleLabel.font = [UIFont boldSystemFontOfSize:btnPrev.titleLabel.font.pointSize+3];
you can do bold label/button font also using this
你也可以使用这个来做粗体标签/按钮字体
回答by Richard Venable
As has already been mentioned in these answers, you just need the right font name. I find that iOSFonts.comis the most helpful resource for knowing exactly what name to use.
正如这些答案中已经提到的，您只需要正确的字体名称。我发现 iOSFonts.com是准确了解要使用的名称的最有用的资源。
