iOS 8 上 UITableView 中的重叠标签，但在 iOS 7 中没有

Question

如果我在 iOS8 上而不是在 iOS 7 上运行我的应用程序，似乎标签 (lblscore) 重叠。当我检查它时，cell.addSubviews(lblscore) 导致了它，但我无法删除它，因为如果我这样做，该标签将根本不显示。我没有使用故事板。

这是我在 cellForRowAtIndexPath 中的代码

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! UITableViewCell
    var i = 0
    var lblname = UILabel()
    var lblmsg = UILabel()
    let row = indexPath.row
    var forName = ""
    var forScore = 0
    if let not_me = threads[row]["not_me"] as? NSDictionary{
        if let username = not_me["username"] as? String{
            forName = username
        }
        if let score = threads[row]["partner_score"] as? Int{
            forScore = score
        }
        if (not_me == [:]){
            if let username = defaults.valueForKey("username") as? String{
                forName = username
            }
            if let score = threads[row]["author_score"] as? Int{
                forScore = score
            }
        }
    }
    for sub in cell.subviews{
        if (sub.subviews.count>6){
            for sub1 in sub.subviews{
                i++
                if ((i>0) && !(i==7)){
                    switch (i){
                    case 3:
                        lblmsg = sub1 as! UILabel
                        lblmsg.text = ""
                        lblmsg.text = threads[row]["content"] as? String
                        lblmsg.sizeToFit()
                    case 4:
                        lblname = sub1 as! UILabel
                        lblname.text = ""
                        lblname.sizeToFit()
                        lblname.text = forName
                        lblname.sizeToFit()
                        lblname.frame = CGRectMake(40, 10, lblname.bounds.width, lblname.bounds.height+4)
                        lblmsg.frame = CGRectMake(40, lblname.bounds.height-5, UIScreen.mainScreen().bounds.width-100,50)
                    case 5:
                        let lbldate : UILabel = sub1 as! UILabel
                        lbldate.text = ""
                        lbldate.sizeToFit()
                        lbldate.text = threads[row]["timeAgo"] as? String
                        lbldate.sizeToFit()
                        lbldate.frame = CGRectMake(UIScreen.mainScreen().bounds.width/3*2, 15, lbldate.bounds.width, 15)
                    case 6:
                        let lblscore : UILabel = sub1 as! UILabel
                        lblscore.text = ""
                        lblscore.sizeToFit()
                        lblscore.text = "\(forScore)"
                        lblscore.sizeToFit()
                        if(lblscore.bounds.width == 15){
                            lblscore.frame = CGRectMake(lblname.bounds.width+50, 10, lblscore.bounds.width+5, lblscore.bounds.height+4)}
                        else{
                            lblscore.frame = CGRectMake(lblname.bounds.width+50, 10, lblscore.bounds.width+10, lblscore.bounds.height+4)}
                    default:
                        print("")
                    }
                }
                if (i==7){
                    let btnDelete = sub1 as! UIButton
                    btnDelete.tag = row
                }
            }
        }
        else{
            cell.alpha = 0
            let lblscore = UILabel()
            let btnDelete = UIButton(frame: CGRectMake(UIScreen.mainScreen().bounds.width-18, 22.5, 22, 30))
            btnDelete.tag = row
            btnDelete.addTarget(self, action: "openDeleteBar:", forControlEvents: UIControlEvents.TouchUpInside)
            lblscore.backgroundColor = UIColor(red: (102/255), green: (193/255), blue: (144/255), alpha: 1)
            btnDelete.backgroundColor = UIColor(patternImage: UIImage(named: "grayBin")!)
            lblname.text = forName
            lblname.sizeToFit()
            lblscore.text = "\(forScore)"
            lblscore.sizeToFit()
            lblname.frame = CGRectMake(40, 10, lblname.bounds.width, lblname.bounds.height+4)
            let lblmsg = UILabel(frame: CGRectMake(40, lblname.bounds.height-5, UIScreen.mainScreen().bounds.width-100,50))
            lblmsg.text = threads[row]["content"] as? String
            if(lblscore.bounds.width == 15){
                lblscore.frame = CGRectMake(lblname.bounds.width+40, 10, lblscore.bounds.width+5, lblscore.bounds.height+4)}
            else{
                lblscore.frame = CGRectMake(lblname.bounds.width+40, 10, lblscore.bounds.width+10, lblscore.bounds.height+4)}
            lblscore.layer.borderWidth = 1
            lblscore.clipsToBounds = true
            lblscore.layer.cornerRadius = 10
            lblscore.textAlignment = .Center
            let lbldate = UILabel()
            lbldate.text = threads[row]["timeAgo"] as? String
            lbldate.sizeToFit()
            lbldate.frame = CGRectMake(UIScreen.mainScreen().bounds.width/3*2, 15, lbldate.bounds.width, 15)
            lblname.font = UIFont(name: "Roboto", size: 15)
            lblmsg.font = UIFont(name: "Roboto", size: 13)
            lbldate.font = UIFont(name: "Roboto", size: 13)
            lblscore.font = UIFont(name: "Roboto", size: 15)
            lbldate.textColor = UIColor.lightGrayColor()
            lblmsg.textColor = UIColor.lightGrayColor()
            lblscore.textColor = UIColor.whiteColor()
            cell.selectionStyle = .None
            cell.addSubview(lblmsg)
            cell.addSubview(lblname)
            cell.addSubview(lbldate)
                cell.addSubview(lblscore)
            cell.addSubview(btnDelete)
            UIView.animateWithDuration(0.2, delay: 0, options: nil, animations: {
                cell.alpha = 1
                }, completion: nil)
        }
    }
    return cell
}

Answer 1

我希望这对遇到这种情况的人有所帮助。我自己找到了解决方案。由于我的应用程序可以在 iOS 8 和 iOS 7 中运行，首先要做的是识别版本然后识别单元格。要知道单元格是否为空，'cell == nil' 将永远无法工作，因为在 iOS8 中单元格已经有 2 个子视图（内容视图和分隔符）。在 iOS 7 中，在获取单元之前，您必须通过它的包装器。

进一步解释...

let version = "\(Array(String(UIDevice.currentDevice().systemVersion))[0])"//get device version
if (version == "7"){//if iOS 7
    for wrapper in cell.subviews{//go to the wrapper
        if (wrapper.subviews.count==2){//if the wrapper contains the content view and the separator only
            //Here you will add the contents of the cell
        }
        else{//if wrapper has more subview which indicate that it is already filled
        var i = 0
                for sub in wrapper.subviews{//scan all subviews of wrapper
                    i++
                    if (i>2){//delete items 3 and beyond since the content view and separator is in the first 2
                        sub.removeFromSuperview()//remove them
                    }
                }
                //Here you will add the contents of the cell
        }
}
}
else{//if iOS 8
if (cell.subviews.count==2){//if the cell contains the content view and the separator only
            //Here you will add the contents of the cell
        }
        else{//if cell has more subview which indicate that it is already filled
        var i = 0
                for sub in cell.subviews{//scan all subviews of wrapper
                    i++
                    if (i>2){//delete items 3 and beyond since the content view and separator is in the first 2
                        sub.removeFromSuperview()//remove them
                    }
                }
                //Here you will add the contents of the cell
        }
    }
}

现在，当表格试图重用一个单元格时，它会在添加新内容之前删除该单元格的内容。我希望这会对很多人有所帮助。