我有一个UIPickerView，如何让它变成多行？我有一些长文本。这是我的代码。funcpickerView(pickerView:UIPickerView,titleForRowrow:Int,forComponentcomponent:Int)->String?{varreturnResult:String=""ifpickerView.tag==1{//Thispickerhaslongtextletposition:UInt=UInt(row)returnResult=list.objectAtIndex(position).Description.Value;}elseif