ios - UITableViewCell with UITextfield not centeringY in correct manner -


i want tableviewcells vertically centered uitextfield. think set nslayoutconstraint right, textfield not centered. did wrong?

enter image description here

func createcellaseditablecell(){     let textfield = uitextfield(frame: cgrectmake(0, 0, self.contentview.frame.width, self.contentview.frame.height))     let views = ["textfield" : textfield]     self.contentview.addsubview(textfield)      let horizontalconstraint = nslayoutconstraint.constraintswithvisualformat("h:|-20-[textfield]", options: nslayoutformatoptions(0), metrics: nil, views: views)     let verticalconstraint = nslayoutconstraint(item: textfield, attribute: nslayoutattribute.centery, relatedby: nslayoutrelation.equal, toitem: self.contentview, attribute: nslayoutattribute.centery, multiplier: 1, constant: 0)     textfield.settranslatesautoresizingmaskintoconstraints(false)      self.contentview.settranslatesautoresizingmaskintoconstraints(false)     nslayoutconstraint.activateconstraints(horizontalconstraint)     nslayoutconstraint.activateconstraints([verticalconstraint])     textfield.placeholder = "textfield" }

the problem see here mixing setting frame code , setting constraints @ same time. not want have auto resizing mask translated constraints, position textfield in container making big fit contentview rectangle according positioning constraints (look @ width of textfield , margin set it).

what is:

1) create textfield without setting frame code (use different initialiser -> in objective-c [[uitextfield alloc]init])

2) leave centre constraints are

3) set vertical constraint v:|[textfield]|

4) set horizontal 1 h:|-20-[textfield]|

5) not turn off translationautoresizingmask on contentview, you not responsible layouting in container wrong!


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