严格根据文本和字体获取 UILabels 大小
NSString
提供方法 boundingRectWithSize
,可用于根据文本和字体预测 UILabel
的结果 CGSize,而无需创建 UILabel
Objective-C
[[text boundingRectWithSize:maxSize options:(NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin) attributes:@{NSFontAttributeName: fontName} context:nil] size];
迅速
let nsText = text as NSString?
nsText?.boundingRectWithSize(maxSize, options: [.TruncatesLastVisibleLine, .UsesLineFragmentOrigin], attributes: [NSFontAttributeName: fontName], context: nil).size
迅速
创建标签和标签高度约束出口。添加以下代码,将文本标记为标签。
@IBOutlet var lblDescriptionHeightConstration: NSLayoutConstraint!
@IBOutlet weak var lblDescription: UILabel!
let maxWidth = UIScreen.mainScreen().bounds.size.width - 40
let sizeOfLabel = self.lblDesc.sizeThatFits(CGSize(width: maxWidth, height: CGFloat.max))
self.lblDescriptionHeightConstration.constant = sizeOfLabel.height
注意:40
是屏幕左右两侧的空间。