是否有可能减少文本之间的差距,当把在一个UILabel多行?我们可以设置框架,字体大小和行数。我想减少标签中两行之间的差距。
当前回答
下面是UILabel的一个子类,它设置lineHeightMultiple并确保内在高度足够大,不会截断文本。
@IBDesignable
class Label: UILabel {
override var intrinsicContentSize: CGSize {
var size = super.intrinsicContentSize
let padding = (1.0 - lineHeightMultiple) * font.pointSize
size.height += padding
return size
}
override var text: String? {
didSet {
updateAttributedText()
}
}
@IBInspectable var lineHeightMultiple: CGFloat = 1.0 {
didSet {
updateAttributedText()
}
}
private func updateAttributedText() {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineHeightMultiple = lineHeightMultiple
attributedText = NSAttributedString(string: text ?? "", attributes: [
.font: font,
.paragraphStyle: paragraphStyle,
.foregroundColor: textColor
])
invalidateIntrinsicContentSize()
}
}
其他回答
我想在这个答案中加入一些新的东西,这样我就不会感觉那么糟糕了……以下是斯威夫特的回答:
import Cocoa
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 40
let attrString = NSMutableAttributedString(string: "Swift Answer")
attrString.addAttribute(.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, attrString.length))
var tableViewCell = NSTableCellView()
tableViewCell.textField.attributedStringValue = attrString
简单的回答是:你不能。要改变文本行间的间距,你必须继承UILabel并滚动自己的drawTextInRect,或者创建多个标签。”
参见:设置UILabel行间距
这是一个非常老的答案,其他人已经添加了新的更好的方法来处理这个问题。请参阅下面提供的最新答案。
在Swift 2.0中…
添加一个扩展:
extension UIView {
func attributesWithLineHeight(font: String, color: UIColor, fontSize: CGFloat, kern: Double, lineHeightMultiple: CGFloat) -> [String: NSObject] {
let titleParagraphStyle = NSMutableParagraphStyle()
titleParagraphStyle.lineHeightMultiple = lineHeightMultiple
let attribute = [
NSForegroundColorAttributeName: color,
NSKernAttributeName: kern,
NSFontAttributeName : UIFont(name: font, size: fontSize)!,
NSParagraphStyleAttributeName: titleParagraphStyle
]
return attribute
}
}
现在,设置你的UILabel为attributedText:
self.label.attributedText = NSMutableAttributedString(string: "SwiftExample", attributes: attributesWithLineHeight("SourceSans-Regular", color: UIColor.whiteColor(), fontSize: 20, kern: 2.0, lineHeightMultiple: 0.5))
显然,我添加了一堆您可能不需要的参数。玩周围-随时重写方法-我正在寻找这个在一堆不同的答案,所以我想我会张贴整个扩展,以防它帮助某人在那里…rab
下面是一个子类UILabel具有行高属性的类:https://github.com/LemonCake/MSLabel
从接口生成器(Storyboard/XIB):
编程:
斯威夫特4
使用标签扩展
extension UILabel {
// Pass value for any one of both parameters and see result
func setLineSpacing(lineSpacing: CGFloat = 0.0, lineHeightMultiple: CGFloat = 0.0) {
guard let labelText = self.text else { return }
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = lineSpacing
paragraphStyle.lineHeightMultiple = lineHeightMultiple
let attributedString:NSMutableAttributedString
if let labelattributedText = self.attributedText {
attributedString = NSMutableAttributedString(attributedString: labelattributedText)
} else {
attributedString = NSMutableAttributedString(string: labelText)
}
// Line spacing attribute
attributedString.addAttribute(NSAttributedStringKey.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, attributedString.length))
self.attributedText = attributedString
}
}
现在调用扩展函数
let label = UILabel()
let stringValue = "How to\ncontrol\nthe\nline spacing\nin UILabel"
// Pass value for any one argument - lineSpacing or lineHeightMultiple
label.setLineSpacing(lineSpacing: 2.0) . // try values 1.0 to 5.0
// or try lineHeightMultiple
//label.setLineSpacing(lineHeightMultiple = 2.0) // try values 0.5 to 2.0
或者使用标签实例(只要复制并执行这段代码就可以看到结果)
let label = UILabel()
let stringValue = "How to\ncontrol\nthe\nline spacing\nin UILabel"
let attrString = NSMutableAttributedString(string: stringValue)
var style = NSMutableParagraphStyle()
style.lineSpacing = 24 // change line spacing between paragraph like 36 or 48
style.minimumLineHeight = 20 // change line spacing between each line like 30 or 40
// Line spacing attribute
attrString.addAttribute(NSAttributedStringKey.paragraphStyle, value: style, range: NSRange(location: 0, length: stringValue.characters.count))
// Character spacing attribute
attrString.addAttribute(NSAttributedStringKey.kern, value: 2, range: NSMakeRange(0, attrString.length))
label.attributedText = attrString
斯威夫特3
let label = UILabel()
let stringValue = "How to\ncontrol\nthe\nline spacing\nin UILabel"
let attrString = NSMutableAttributedString(string: stringValue)
var style = NSMutableParagraphStyle()
style.lineSpacing = 24 // change line spacing between paragraph like 36 or 48
style.minimumLineHeight = 20 // change line spacing between each line like 30 or 40
attrString.addAttribute(NSParagraphStyleAttributeName, value: style, range: NSRange(location: 0, length: stringValue.characters.count))
label.attributedText = attrString
在UITextView或UILabel扩展中,添加这个函数:
我添加了一些代码来保持当前的带属性文本,如果您已经在视图中使用带属性字符串(而不是覆盖它们)。
func setLineHeight(_ lineHeight: CGFloat) {
guard let text = self.text, let font = self.font else { return }
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 1.0
paragraphStyle.lineHeightMultiple = lineHeight
paragraphStyle.alignment = self.textAlignment
var attrString:NSMutableAttributedString
if let attributed = self.attributedText {
attrString = NSMutableAttributedString(attributedString: attributed)
} else {
attrString = NSMutableAttributedString(string: text)
attrString.addAttribute(NSFontAttributeName, value: font, range: NSMakeRange(0, attrString.length))
}
attrString.addAttribute(NSParagraphStyleAttributeName, value:paragraphStyle, range:NSMakeRange(0, attrString.length))
self.attributedText = attrString
}