我创建了自己的UITableViewCell子类。有几个子视图（2x imageview，2x UILabel）。我以编程方式做了所有事情也限制了但是在某些单元格上，autolayout没有正确计算，我不知道为什么。这里是我提到的问题screenshot。
感谢您的任何建议。
这是我的手机来源
//menu list cell
class TableMenuViewCell: UITableViewCell{
var stripe:UIView?
var separatorTop:UIView?
var separatorBottom:UIView?
var imageBox:UIView?
var img:UIImageView?
var dateBox:UIImageView?
var date:UILabel?
var label:UILabel?
var desc:UILabel?
var foreground:UIView?
var multiplier:CGFloat = 1
var didSetupConstraints:Bool = false
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
self.backgroundColor = Constants.grayColor
if UIDevice.currentDevice().userInterfaceIdiom == UIUserInterfaceIdiom.Pad {
multiplier = 1.3
}
//stripe
stripe = UIView()
stripe!.backgroundColor = Constants.light2GrayColor
stripe!.translatesAutoresizingMaskIntoConstraints = false
addSubview(stripe!)
//image box
imageBox = UIView()
imageBox!.backgroundColor = UIColor.clearColor()
imageBox!.translatesAutoresizingMaskIntoConstraints = false
addSubview(imageBox!)
//image view
img = UIImageView()
img!.backgroundColor = UIColor.clearColor()
img!.contentMode = UIViewContentMode.ScaleAspectFill
img!.clipsToBounds = true;
img!.translatesAutoresizingMaskIntoConstraints = false
imageBox!.addSubview(img!)
//constraints
imageBox!.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-0-[img]-0-|", options: [], metrics: nil, views: ["img" : img! ]))
imageBox!.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-0-[img]-0-|", options: [], metrics: nil, views: ["img" : img! ]))
//label
label = UILabel()
label!.numberOfLines = 0
label!.backgroundColor = UIColor.clearColor()
label!.textColor = UIColor.whiteColor()
label!.textAlignment = NSTextAlignment.Left
label!.font = UIFont(name: Constants.FONT_MEDIUM, size: Constants.MENU_LABEL_FONT_SIZE * multiplier)
label!.translatesAutoresizingMaskIntoConstraints = false
addSubview(label!)
label!.sizeToFit()
//desc
desc = UILabel()
desc!.numberOfLines = 0
desc!.backgroundColor = UIColor.clearColor()
desc!.textColor = Constants.turquoiseColor
desc!.textAlignment = NSTextAlignment.Left
desc!.font = UIFont(name: Constants.FONT_THIN, size: Constants.MENU_DESC_FONT_SIZE * multiplier)
desc!.translatesAutoresizingMaskIntoConstraints = false
addSubview(desc!)
desc!.sizeToFit()
//separator top
separatorTop = UIView()
separatorTop!.backgroundColor = Constants.lightGrayColor
separatorTop!.translatesAutoresizingMaskIntoConstraints = false
addSubview(separatorTop!)
//separator bottom
separatorBottom = UIView()
separatorBottom!.backgroundColor = Constants.lightGrayColor
separatorBottom!.translatesAutoresizingMaskIntoConstraints = false
addSubview(separatorBottom!)
//foreground
foreground = UIView()
foreground!.backgroundColor = Constants.light2GrayHoverColor
foreground!.alpha = 0.5
foreground!.opaque = false
self.selectedBackgroundView = foreground!
}
//set layout
func setLayout(rowIndex : Int){
if didSetupConstraints{
return
}
else{
didSetupConstraints = true
}
let views:[String:AnyObject] = ["stripe" : stripe!, "imageBox" : imageBox!, "label" : label!, "desc" : desc!, "separatorTop" : separatorTop!, "separatorBottom" : separatorBottom!]
let metrics:[String:AnyObject] = ["hMargin" : Constants.HORIZONTAL_MARGIN, "vMargin" : Constants.VERTICAL_MARGIN, "stripeWidth" : Constants.STRIPE_WIDTH, "separatorHeight" : Constants.SEPARATOR_HEIGHT]
var constraintsArr:[NSLayoutConstraint] = []
//horizontal constraints
constraintsArr.appendContentsOf( NSLayoutConstraint.constraintsWithVisualFormat("H:|-0-[separatorTop]-0-|", options: [], metrics: metrics, views: views) )
constraintsArr.appendContentsOf( NSLayoutConstraint.constraintsWithVisualFormat("H:|-0-[separatorBottom]-0-|", options: [], metrics: metrics, views: views) )
constraintsArr.appendContentsOf( NSLayoutConstraint.constraintsWithVisualFormat("H:|-0-[stripe(==stripeWidth)]-(hMargin)-[imageBox]-(hMargin)-[label]-0-|", options: [], metrics: metrics, views: views) )
constraintsArr.appendContentsOf( NSLayoutConstraint.constraintsWithVisualFormat("H:|-0-[stripe(==stripeWidth)]-(hMargin)-[imageBox]-(hMargin)-[desc]-0-|", options: [], metrics: metrics, views: views) )
constraintsArr.append(NSLayoutConstraint(item: imageBox!, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: self.bounds.height - 4*Constants.VERTICAL_MARGIN))
//vertical constraints
constraintsArr.append(NSLayoutConstraint(item: stripe!, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: self.bounds.height))
constraintsArr.append(NSLayoutConstraint(item: stripe!, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: separatorTop!, attribute: NSLayoutAttribute.Top, multiplier: 1, constant: 0))
constraintsArr.append(NSLayoutConstraint(item: stripe!, attribute: NSLayoutAttribute.Bottom, relatedBy: NSLayoutRelation.Equal, toItem: separatorBottom!, attribute: NSLayoutAttribute.Bottom, multiplier: 1, constant: 0))
constraintsArr.append(NSLayoutConstraint(item: imageBox!, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: self, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant: 0))
constraintsArr.append(NSLayoutConstraint(item: imageBox!, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: self.bounds.height - 4*Constants.VERTICAL_MARGIN))
if desc!.text!.isEmpty {
constraintsArr.append(NSLayoutConstraint(item: label!, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: self, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant: 0))
}else{
constraintsArr.append(NSLayoutConstraint(item: label!, attribute: NSLayoutAttribute.CenterYWithinMargins, relatedBy: NSLayoutRelation.Equal, toItem: self, attribute: NSLayoutAttribute.CenterYWithinMargins, multiplier: 1, constant: -label!.bounds.height*0.5))
constraintsArr.append(NSLayoutConstraint(item: desc!, attribute: NSLayoutAttribute.TopMargin, relatedBy: NSLayoutRelation.Equal, toItem: label!, attribute: NSLayoutAttribute.Bottom, multiplier: 1, constant: Constants.VERTICAL_MARGIN + Constants.VERTICAL_MARGIN * multiplier ))
}
constraintsArr.append(NSLayoutConstraint(item: separatorTop!, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: rowIndex != 0 ? 0 : Constants.SEPARATOR_HEIGHT))
constraintsArr.append(NSLayoutConstraint(item: separatorBottom!, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: Constants.SEPARATOR_HEIGHT))
self.addConstraints(constraintsArr)
}
override func prepareForReuse() {
super.prepareForReuse()
imageView!.image = nil
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
表视图控制器的来源
import UIKit
class MenuViewController: UITableViewController {
var cellHeight:CGFloat = 50
override func viewDidLoad() {
super.viewDidLoad()
initTableView()
}
override func viewDidAppear(animated: Bool) {
super.viewWillAppear(animated)
tableView.reloadData()
}
func initTableView(){
tableView.separatorStyle = UITableViewCellSeparatorStyle.None
tableView.backgroundColor = Constants.grayColor
tableView.delegate = self
tableView.dataSource = self
tableView.estimatedRowHeight = cellHeight
tableView.rowHeight = UITableViewAutomaticDimension
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.registerClass(TableMenuViewCell.self, forCellReuseIdentifier: NSStringFromClass(TableMenuViewCell))
}
override func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return 0.001
}
override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
if UIDevice.currentDevice().userInterfaceIdiom == UIUserInterfaceIdiom.Pad {
return cellHeight * 1.2
}
return cellHeight
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 16
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier( NSStringFromClass(TableMenuViewCell), forIndexPath: indexPath) as! TableMenuViewCell
//stripe
cell.stripe!.backgroundColor = Constants.turquoiseColor
//image
cell.img!.image = UIImage(named: "placeholder")
cell.img!.sizeToFit()
//image box
cell.imageBox!.sizeToFit()
//label
cell.label!.text = "Main Label"
cell.label!.sizeToFit()
//desc
cell.desc!.text = "Description Text"
cell.desc!.sizeToFit()
cell.setLayout(indexPath.row)
cell.setNeedsLayout()
cell.layoutIfNeeded()
return cell
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}