2 UITableView中的自定义单元格上的标签

我试图在消息传递应用程序中添加消息旁边的日期/时间。目前，该单元的自动尺寸对于消息而言非常有效。但是，当我尝试向单元格添加第二个标签时，我得到一个以未捕获异常终止的运行时错误。我正在尝试在单元格左侧的当前消息文本位于单元格右侧的日期。删除约束使得timeLabel从不显示。2 UITableView中的自定义单元格上的标签

这里大部分的cellForRowAtIndexPath方法

 cell.myLabel.font = font 
     cell.myLabel.numberOfLines = 0 
     cell.myLabel.text = self.messages[indexPath.row] 

     cell.myLabel.textColor = UIColor.blue 
     cell.myLabel.textAlignment = .justified 

     let marginGuide = cell.contentView.layoutMarginsGuide 
     cell.myLabel.translatesAutoresizingMaskIntoConstraints = false 
     cell.myLabel.bottomAnchor.constraint(equalTo: marginGuide.bottomAnchor).isActive = true 
     cell.myLabel.topAnchor.constraint(equalTo: marginGuide.topAnchor).isActive = true 

     cell.myLabel.trailingAnchor.constraint(equalTo: marginGuide.trailingAnchor, constant: 0).isActive = true 
     cell.myLabel.backgroundColor = UIColor(patternImage: UIImage(named: "background")!) 

     if size1.width > 260 { 
      cell.myLabel.preferredMaxLayoutWidth = 260 
     } 
     else{ 
      cell.myLabel.preferredMaxLayoutWidth = size1.width 
     } 
     let interval = self.timeStamps[indexPath.row] 
     if let myDouble = NumberFormatter().number(from: interval)?.doubleValue { 
      let date = NSDate(timeIntervalSince1970: myDouble) 
      cell.timeLabel.font = font 
      cell.timeLabel.text = "date"// String(describing: date) 
      cell.timeLabel.translatesAutoresizingMaskIntoConstraints = false 

      cell.timeLabel.bottomAnchor.constraint(equalTo: marginGuide.bottomAnchor).isActive = true 
      cell.timeLabel.topAnchor.constraint(equalTo: marginGuide.topAnchor).isActive = true 
      cell.timeLabel.leadingAnchor.constraint(equalTo: marginGuide.leadingAnchor).isActive = true 
     }

这里是我创建的自定义单元格的整个程序。

import UIKit 

class messageTableViewCell: UITableViewCell { 

var myLabel = UILabel() 
var background = UIImageView() 
var timeLabel = UILabel() 

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

    self.contentView.addSubview(background) 
    self.contentView.addSubview(myLabel) 
} 

required init?(coder aDecoder: NSCoder) { 
    fatalError("init(coder:) has not been implemented") 
} 

override func layoutSubviews() { 
    super.layoutSubviews() 
    myLabel.numberOfLines = 0 
    myLabel.lineBreakMode = NSLineBreakMode.byWordWrapping 
    myLabel.sizeToFit() 
    let marginGuide = contentView.layoutMarginsGuide 
    myLabel.translatesAutoresizingMaskIntoConstraints = false 
    myLabel.bottomAnchor.constraint(equalTo: marginGuide.bottomAnchor).isActive = true 
    myLabel.topAnchor.constraint(equalTo: marginGuide.topAnchor).isActive = true 
    myLabel.trailingAnchor.constraint(equalTo: marginGuide.trailingAnchor, constant: 0).isActive = true 
    myLabel.backgroundColor = UIColor(patternImage: UIImage(named: "background")!) 

    timeLabel.numberOfLines = 0 
    timeLabel.lineBreakMode = NSLineBreakMode.byWordWrapping 
    timeLabel.sizeToFit() 



} 

override func awakeFromNib() { 
    super.awakeFromNib() 
    // Initialization code 
} 

override func setSelected(_ selected: Bool, animated: Bool) { 
    super.setSelected(selected, animated: animated) 

    // Configure the view for the selected state 
} 

}

有人请帮我弄清楚如何添加第二个标签。我已经尝试了一切。

来源

2017-04-24 lawndogg

什么行代码导致崩溃？ – nathan

我为timeLabel设置约束的行： cell.timeLabel.bottomAnchor.constraint（equalTo：marginGuide.bottomAnchor）.isActive = true – lawndogg

您是否在控制台中获得有关崩溃的任何信息？你知道原因是什么吗？ – nathan

我犯了一个粗心的错误，我忘了在我的单元格类中添加子视图。我需要这条线：

self.contentView.addSubview(timeLabel)

来源

2017-04-24 01:23:42 lawndogg

2 UITableView中的自定义单元格上的标签

回答

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