UILabel 的 baselineAdjustment 属性 控制当lable 中的文字自动缩小时如何调整文本的基线。
baselineAdjustment 属性只有在UIlable 的 adjustsFontSizeToFitWidth = true 和 numberOfLines = 1 的时候才生效。
baselineAdjustment 调整文字基线距lable 垂直中线的位置。
let label =UILabel.init(frame:CGRect.init(x:0, y:100, width:100, height:30))
label.backgroundColor = UIColor.green;
label.text = "UIBaselineAdjustment.none"
label.adjustsFontSizeToFitWidth = true
label.baselineAdjustment = UIBaselineAdjustment.none
label.numberOfLines=1
let label1 =UILabel.init(frame:CGRect.init(x:110, y:100, width:100, height:30))
label1.backgroundColor = UIColor.green;
label1.text = "UIBaselineAdjustment.alignCenters"
label1.adjustsFontSizeToFitWidth = true
label1.baselineAdjustment = UIBaselineAdjustment.alignCenters
label1.numberOfLines=1
let label2 =UILabel.init(frame:CGRect.init(x:220, y:100, width:100, height:30))
label2.backgroundColor = UIColor.green;
label2.text = "UIBaselineAdjustment.alignBaselines"
label2.adjustsFontSizeToFitWidth = true
label2.baselineAdjustment = UIBaselineAdjustment.alignBaselines
label2.numberOfLines=1
self.view.addSubview(label)
self.view.addSubview(label1)
self.view.addSubview(label2)
let vieline =UIView.init(frame:CGRect.init(x:0, y:115, width:400, height:0.3))
vieline.backgroundColor = UIColor.red
self.view.addSubview(vieline)
