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[已解决]swift中UITableView中的自动布局iOS 8正常但是iOS 9.2中出错:Unable to simultaneously satisfy constraints

iOS crifan 1007浏览 0评论

对于同样的代码:

    override func viewDidLoad() {
        super.viewDidLoad()
        //1. message table view
        self.tableView.backgroundColor = AppBackgoundColor
        self.tableView.tableFooterView = UIView()
        self.tableView.separatorStyle = .None
        self.tableView.bounces = true
        self.tableView.delegate = self
        self.tableView.dataSource = self
        self.tableView.registerClass(ChatTableViewCell.self, forCellReuseIdentifier: ChatTableViewCellId)
        self.tableView.registerClass(NotificationTableViewCell.self, forCellReuseIdentifier: NotificationTableViewCellId)
        self.tableView.registerClass(TextTableViewCell.self, forCellReuseIdentifier: TextTableViewCellId)
        self.tableView.registerClass(FileTableViewCell.self, forCellReuseIdentifier: FileTableViewCellId)
        self.tableView.registerClass(ImageTableViewCell.self, forCellReuseIdentifier: ImageTableViewCellId)
        self.view.addSubview(self.tableView)
}
    func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
        return UITableViewAutomaticDimension
    }

和:

        self.sendTimeLabel = UILabel()
        super.init(style: UITableViewCellStyle.Default, reuseIdentifier: reuseIdentifier)
        self.contentView.backgroundColor = AppBackgoundColor
        //common settings
        self.selectionStyle = .None
        if self.messageItem.isShowSendTime {
            self.sendTimeLabel.hidden = false
            self.sendTimeLabel.text = self.messageItem.sendTimeStr
            self.sendTimeLabel.backgroundColor = UIColor.clearColor()
            self.sendTimeLabel.textColor = ChatCellTimeColor
            self.sendTimeLabel.font = ChatCellTimeFont
            self.sendTimeLabel.textAlignment = .Center
            //self.sendTimeLabel.contentMode = .Center
            self.contentView.addSubview(self.sendTimeLabel)
            constrain(sendTimeLabel) { sendTimeLabel in
                sendTimeLabel.left == sendTimeLabel.superview!.left
                sendTimeLabel.right == sendTimeLabel.superview!.right
                sendTimeLabel.centerX == sendTimeLabel.superview!.centerX
                sendTimeLabel.top == sendTimeLabel.superview!.top + ChatCellTimePaddingTop
                sendTimeLabel.height == ChatCellTimeHeight
            }
            //for debug
            self.sendTimeLabel.backgroundColor = UIColor.greenColor()
        } else {
            self.sendTimeLabel.hidden = true
        }

在iOS 8.1中工作正常,没有报错,显示也正常:

在iOS 9.3中出错:

2016-07-31 21:08:16.153 Workhub[5281:3576674] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don’t want. 
    Try this: 
        (1) look at each constraint and try to figure out which you don’t expect; 
        (2) find the code that added the unwanted constraint or constraints and fix it. 
(
    "<NSLayoutConstraint:0x7b9bac00 V:|-(15)-[UILabel:0x7b9b9a10’\U6628\U5929 \U4e0a\U534810:50′]   (Names: ‘|’:UITableViewCellContentView:0x7b9ba2b0 )>",
    "<NSLayoutConstraint:0x7b9bb120 V:[UILabel:0x7b9b9a10’\U6628\U5929 \U4e0a\U534810:50′(15)]>",
    "<NSLayoutConstraint:0x7baadef0 V:[UILabel:0x7b9b9a10’\U6628\U5929 \U4e0a\U534810:50′]-(15)-[UILabel:0x7b9b8f70’\U8d75\U8fdc\U5229\U9080\U8bf7\U4f60\U52a0\U5165\U7b80\U9053\U9700\U6c42\U7ec4′]>",
    "<NSLayoutConstraint:0x79758280 UILabel:0x7b9b8f70’\U8d75\U8fdc\U5229\U9080\U8bf7\U4f60\U52a0\U5165\U7b80\U9053\U9700\U6c42\U7ec4′.bottom == UITableViewCellContentView:0x7b9ba2b0.bottom>",
    "<NSLayoutConstraint:0x796a6460 ‘UIView-Encapsulated-Layout-Height’ V:[UITableViewCellContentView:0x7b9ba2b0(44)]>"
)
Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7b9bb120 V:[UILabel:0x7b9b9a10’昨天 上午10:50′(15)]>

且显示异常:

swift ios 9.3 Unable to simultaneously satisfy constraints

SnapKit autolayout broken: “Unable to simultaneously satisfy constraints” / mm1886.com

ios – Unable to simultaneously satisfy constraints Warnings with AVPlayerViewController embedded in storyboard – Stack Overflow

ios – Unable to simultaneously satisfy constraints, will attempt to recover by breaking constraint – Stack Overflow

UIStackView “Unable to simultaneously satisfy constraints” on “squished” hidden views / gdomc.com

Unable to simultaneously satisfy constraints on a hidden view controller iOS / gdomc.com

iOS: Unable to simultaneously satisfy constraints / gdomc.com

autolayout – Automatic constraints violations in stack view, Swift 2, iOS 9.3, XCode 7 – Stack Overflow

Unable to simultaneously satisfy constraints – No constraints in place

结果搞笑的是:添加了:

estimatedRowHeight

self.tableView.estimatedRowHeight = 44

就可以了正常显示了:

那再去试试:

把estimatedRowHeight换成:

    func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
        return 44
        //return UITableViewAutomaticDimension
    }

结果也是可以的。

然后又去测试了下,最终结论是:

[总结]

对于使用UI TableView,且使用自动布局去画subView的话

(此处是用Cartography这个库,去实现的自动布局)

-》对于iOS 8.1来说,只需要去设置:

rowHeight为UITableViewAutomaticDimension

自动布局即可正常工作,页面即可正常显示

-》而对于iOS 9.3来说:

必须同时设置:

(1)rowHeight为UITableViewAutomaticDimension

(2)estimatedRowHeight为某个具体的值,比如此处的44,而不是UITableViewAutomaticDimension(内部是-1)

然后自动布局才可以正常工作,否则漏了estimatedRowHeight的话,就会报上述的错误:

Unable to simultaneously satisfy constraints

而导致显示不正常。

转载请注明:在路上 » [已解决]swift中UITableView中的自动布局iOS 8正常但是iOS 9.2中出错:Unable to simultaneously satisfy constraints

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