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[已解决]UITableViewCell中的自动布局时text或label无法增加高度

iOS crifan 1207浏览 0评论

tableView中的heightForRowAtIndexPath用的是UITableViewAutomaticDimension:

    func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {

        return UITableViewAutomaticDimension

//        return 80

    }

然后对应的cell:

TimelineTableViewCell

中,全都是自动布局,包括对应的textView(后面换成label):

//    let middleDetailTextView:UITextView

    let middleDetailTextView:UILabel

        self.middleTitleLabel = UILabel()

//        self.middleDetailTextView = UITextView()

        self.middleDetailTextView = UILabel()

        self.rightTitleLabel = UILabel()

        //4.middle title

        self.middleTitleLabel.text = memoItem.title

        self.middleTitleLabel.font = MiddleTitleFont

        self.contentView.addSubview(self.middleTitleLabel)

        constrain(middleTitleLabel, bulletImageView) {middleTitleLabel, bulletImageView in

            middleTitleLabel.top == bulletImageView.top

            middleTitleLabel.left == bulletImageView.right + MiddleTitlePaddingLeft

            middleTitleLabel.height == MiddleTitleHeight

            middleTitleLabel.right == middleTitleLabel.superview!.right – (RightTitleWidth + RightTitlePaddingRight)

        }

       

        //5.middle detail text

        self.middleDetailTextView.text = memoItem.detail

        self.middleDetailTextView.font = MiddleDetailTextFont

        self.middleDetailTextView.textAlignment = NSTextAlignment.Left

       

//        self.middleDetailTextView.editable = false

        self.middleDetailTextView.numberOfLines = 0

//        self.middleDetailTextView.sizeToFit()

        self.middleDetailTextView.lineBreakMode = .ByCharWrapping

//        self.middleDetailTextView.contentMode = .Left

        self.contentView.addSubview(self.middleDetailTextView)

        constrain(middleDetailTextView, middleTitleLabel) {middleDetailTextView, middleTitleLabel in

            middleDetailTextView.top == middleTitleLabel.bottom + MiddleDetailTextPaddingTop

            middleDetailTextView.left == middleTitleLabel.left

            //middleDetailTextView.right <= middleDetailTextView.superview!.right

            middleDetailTextView.right == middleDetailTextView.superview!.right

            //middleDetailTextView.bottom <= middleDetailTextView.superview!.bottom

            middleDetailTextView.bottom == middleDetailTextView.superview!.bottom

            middleDetailTextView.height >= 20

        }

       

        //6.right title

        let timeStr = memoItem.time.toString("yyyy-MM-dd")

        self.rightTitleLabel.text = timeStr

        self.rightTitleLabel.font = RightTitleFont

        self.contentView.addSubview(self.rightTitleLabel)

        constrain(rightTitleLabel, middleTitleLabel) {rightTitleLabel, middleTitleLabel in

            rightTitleLabel.centerY == middleTitleLabel.centerY

            //rightTitleLabel.left == middleTitleLabel.right

            rightTitleLabel.width == RightTitleWidth

            rightTitleLabel.right == rightTitleLabel.superview!.right – RightTitlePaddingRight

            rightTitleLabel.height == middleTitleLabel.height

        }

结果就是detail部分的text,无法自动增加高度:

试了各种办法:

1.把UITextView换成UILabel

2.把cell的初始化,带上reuse的id:

    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {

        self.leftTitleLabel = UILabel()

        self.bulletImageView = UIImageView()

        self.timelineView = UIView()

        self.middleTitleLabel = UILabel()

//        self.middleDetailTextView = UITextView()

        self.middleDetailTextView = UILabel()

        self.rightTitleLabel = UILabel()

       

        super.init(style: style, reuseIdentifier: reuseIdentifier)

       

        self.imageView?.image = nil

        self.imageView?.hidden = true

        self.textLabel?.text = nil

        self.textLabel?.hidden = true

        self.detailTextLabel?.text = nil

        self.detailTextLabel?.hidden = true

       

        self.selectionStyle = UITableViewCellSelectionStyle.None

       

        self.accessoryType = UITableViewCellAccessoryType.None

        self.accessoryView = nil

    }

   

    convenience init(memoItem:MemoItem, isTopest:Bool = false, timelineWidth:CGFloat = TimelineWidth, timelineColor:UIColor = TimelineColor, reuseIdentifier: String?) {

        self.init(style: UITableViewCellStyle.Default, reuseIdentifier:reuseIdentifier)

3.给textview或label设置各种参数:

        //5.middle detail text

        self.middleDetailTextView.text = memoItem.detail

        self.middleDetailTextView.font = MiddleDetailTextFont

        self.middleDetailTextView.textAlignment = NSTextAlignment.Left

       

//        self.middleDetailTextView.editable = false

        self.middleDetailTextView.numberOfLines = 0

//        self.middleDetailTextView.sizeToFit()

        self.middleDetailTextView.lineBreakMode = .ByCharWrapping

//        self.middleDetailTextView.contentMode = .Left

4.给约束中添加高度至少为20:

            middleDetailTextView.height >= 20

5.也去设置过:

self.tableView.estimatedRowHeight = TimelineTableViewCellEstimatedRowHeight

都不行。

注:

之前,也都用过自动布局,text也是可以自动增加高度的

-》这次始终都没用

-》感觉像是:

虽然给定了:

UITableViewAutomaticDimension

但是cell的contentView的高度,固定死了

swift autolayout uitableviewcell text height

ios – Dynamic Height Issue for UITableView Cells (Swift) – Stack Overflow

增加:

estimatedHeightForRowAtIndexPath

试试

    func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {

        return UITableViewAutomaticDimension

    }

果然生效了:

(约束距离经过调整后)

[总结]

此处,UITableViewCell中自定义添加的(多行的)Label或TextView,默认是没法让contentView的高度增加的,只有添加上:

    func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {

        return UITableViewAutomaticDimension

    }

   

    func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {

        return UITableViewAutomaticDimension

    }

都添加上,内部的自动布局才能完全生效

-》label才能自动换行,显示出内容

[后记 2016-05-20]

后来把iOS模拟器从之前的iOS 8.1的话,不论是iPhone 5还是iPhone 6

结果不用:

    func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {

        return UITableViewAutomaticDimension

    }

和:

self.tableView.estimatedRowHeight = UITableViewAutomaticDimension

然后都可以正常运行显示出label的

而如果是iOS 9.3的话,则必须用:

    func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {

        return UITableViewAutomaticDimension

    }

不能用:

self.tableView.estimatedRowHeight = UITableViewAutomaticDimension

然后label才可以显示。

-》看来是iOS 8.1到9.3,内部和tableview相关的api,改动了什么地方。

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