在tableview單元格中更改視圖的顏色不會更改

Question

我正在更改tableViewCell中某個視圖的背景顏色，但它在第一次加載時不會更改，我需要滾動才能看到更改。這是我的手機類：

@IBOutlet weak var status_back: UIView! 
@IBOutlet weak var status_label: UILabel! 
@IBOutlet weak var node_label: UILabel! 
@IBOutlet weak var time_label: UILabel! 
@IBOutlet weak var name_label: UILabel! 
@IBOutlet weak var res_date: UILabel! 

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

override func awakeFromNib() { 
    super.awakeFromNib() 
} 

override func layoutSubviews() { 
    status_back.layer.cornerRadius = status_back.frame.height/2 
} 

和改變status_back的顏色的ViewController代碼：

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 
    let cellIdentifier = "MealCell" 
    let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as! ReservationCell 
    let reservation = filteredreservations[(indexPath as NSIndexPath).row] 
    cell.name_label.text = "نام: "+reservation.client_name 
    cell.name_label.font = UIFont(name: "WeblogmaYekan", size: 17) 
    cell.time_label.text="زمان: "+reservation.ft_of_time+"-"+reservation.ft_to_time 
    cell.time_label.font = UIFont(name: "B Yekan", size: 17) 
    cell.res_date.text="تاریخ: \(reservation.date)" 
    cell.res_date.font = UIFont(name: "B Yekan", size: 17) 
    var status = "" 
    if reservation.type { 
     cell.node_label.text="ex1 \(reservation.node_title)" 
    } else { 
     cell.node_label.text="ex2" 
    } 
    switch reservation.res_status { 
    case "CanceledByAdmin": 
     cell.status_back.backgroundColor=Utils.UIColorFromRGB(rgbValue: 0xFFFC635D) 
     status = "ex" 
    case "Canceled": 
     cell.status_back.backgroundColor=Utils.UIColorFromRGB(rgbValue: 0xFFEE903D) 
     status = "ex" 
    case "Deprecated": 
     cell.status_back.backgroundColor=Utils.UIColorFromRGB(rgbValue: 0xFF757575) 
     status = "ex" 
    default: 
     cell.status_back.backgroundColor=Utils.UIColorFromRGB(rgbValue: 0xFF3BA757) 
     status = "ex" 
    } 
    cell.status_label.text=status 
    cell.status_label.font = UIFont(name: "WeblogmaYekan", size: 17) 
    return cell 
} 

Answer 1

我找到了答案。創建小區時，有用於status_back.frame.height沒有數據，所以

override func layoutSubviews() { 
    status_back.layer.cornerRadius = status_back.frame.height/2 
} 

使得status_back無形的，在下一次循環代碼工作

Answer 2

你千萬不要在這種情況下使用break，因爲break意味着它會從交換機退出。

從夫特3文檔：

在與C和Objective-C switch語句相反，切換在夫特 語句不通過每個殼體的底部和 落入由默認下一個。相反，只要完成第一個匹配開關案例 ，整個開關語句 就會結束其執行，而不需要明確的中斷語句。這使得 開關語句比C中的開關語句更安全和更易於使用，並且避免錯誤地執行多個開關情況。

開關控制流結束某些情況下，在滿足斯威夫特後右。

switch reservation.res_status { 
    case "CanceledByAdmin": 
     color = Utils.UIColorFromRGB(rgbValue: 0xFFFC635D) 
     status = "example4"   
    case "Canceled": 
     color = Utils.UIColorFromRGB(rgbValue: 0xFFEE903D) 
     status = "example3" 
    case "Deprecated": 
     color = Utils.UIColorFromRGB(rgbValue: 0xFF757575) 
     status = "example2" 
    default: 
     color = Utils.UIColorFromRGB(rgbValue: 0xFF3BA757) 
     status = "example" 
    } 

    cell.status_label.text=status 
    cell.status_back.backgroundColor = color 
    cell.status_label.font = UIFont(name: "WeblogmaYekan", size: 17) 
    return cell