2 UITableView中的自定義單元格上的標籤

我試圖在消息傳遞應用程序中添加消息旁邊的日期/時間。目前，該單元的自動尺寸對於消息而言非常有效。但是，當我嘗試向單元格添加第二個標籤時，我得到一個以未捕獲異常終止的運行時錯誤。我正在嘗試在單元格左側的當前消息文本位於單元格右側的日期。刪除約束使得timeLabel從不顯示。2 UITableView中的自定義單元格上的標籤

這裏大部分的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 
     }

這裏是我創建的自定義單元格的整個程序。

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 
} 

}

有人請幫我弄清楚如何添加第二個標籤。我已經嘗試了一切。

來源

2017-04-24 lawndogg

什麼行代碼導致崩潰？ – nathan

我爲timeLabel設置約束的行： cell.timeLabel.bottomAnchor.constraint（equalTo：marginGuide.bottomAnchor）.isActive = true – lawndogg

您是否在控制檯中獲得有關崩潰的任何信息？你知道原因是什麼嗎？ – nathan

我犯了一個粗心的錯誤，我忘了在我的單元格類中添加子視圖。我需要這條線：

self.contentView.addSubview(timeLabel)

來源

2017-04-24 01:23:42 lawndogg

2 UITableView中的自定義單元格上的標籤

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