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
我做了这个简单的扩展,非常适合我:
extension UILabel {
func setLineHeight(lineHeight: CGFloat) {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 1.0
paragraphStyle.lineHeightMultiple = lineHeight
paragraphStyle.alignment = self.textAlignment
let attrString = NSMutableAttributedString()
if (self.attributedText != nil) {
attrString.append( self.attributedText!)
} else {
attrString.append( NSMutableAttributedString(string: self.text!))
attrString.addAttribute(NSAttributedStringKey.font, value: self.font, range: NSMakeRange(0, attrString.length))
}
attrString.addAttribute(NSAttributedStringKey.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, attrString.length))
self.attributedText = attrString
}
}
复制到一个文件中,这样你就可以像这样使用它了
myLabel.setLineHeight(0.7)
其他回答
在ios6中有另一个答案,那就是在标签上设置attributedText,使用NSAttributedString和适当的段落样式。关于NSAttributedString的行高,请参阅堆栈溢出答案:
NSAttributedString行高,对吗?
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
}
这段代码适用于我(ios 7和ios 8肯定是如此)。
_label.numberOfLines=2;
_label.textColor=[UIColor whiteColor];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineHeightMultiple=0.5;
paragraphStyle.alignment = NSTextAlignmentCenter;
paragraphStyle.lineSpacing = 1.0;
NSDictionary *nameAttributes=@{
NSParagraphStyleAttributeName : paragraphStyle,
NSBaselineOffsetAttributeName:@2.0
};
NSAttributedString *string=[[NSAttributedString alloc] initWithString:@"22m\nago" attributes:nameAttributes];
_label.attributedText=string;
Swift 4标签扩展。在传入函数之前创建NSMutableAttributedString,以防有属性文本需要额外的属性。
extension UILabel {
func setLineHeightMultiple(to height: CGFloat, withAttributedText attributedText: NSMutableAttributedString) {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 1.0
paragraphStyle.lineHeightMultiple = height
paragraphStyle.alignment = textAlignment
attributedText.addAttribute(.paragraphStyle, value: paragraphStyle, range: NSRange(location: 0, length: attributedText.length - 1))
self.attributedText = attributedText
}
}
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