当 presentviewcontroller 或 pushviewcontroller 时 UITableView 被重新加载

Posted 2023-02-23

【中文标题】当 presentviewcontroller 或 pushviewcontroller 时 UITableView 被重新加载

【英文标题】：UITableView is reloaded when presentviewcontroller or pushviewcontroller

【发布时间】：2016-05-20 09:25:28

【问题描述】：

我有一个包含一些复杂单元格的 uitableview，

如果我在按下单元格中的按钮时执行 presentviewcontroller 或 pushviewcontroller，

它会自动重新加载数据，

我怎样才能阻止它？

这是基本控制器

import UIKit

class Controller: UIViewController
    override func viewDidLoad() 
       super.viewDidLoad();

       initView();
    

    func initView()
       self.view.backgroundColor = UIColor.whiteColor();
    

    override func preferredStatusBarStyle() -> UIStatusBarStyle 
       return UIStatusBarStyle.LightContent;
    

这是第二层

import Foundation

class LoadableController: Controller 

    var requestNum                      : Int = 0;

    func loadData(complete: (()->Void)? = nil)
        self.requestComplete();
    

    func requestComplete()
        if(self.requestNum == 0)
            requestFinished();
            return;
        
        self.requestNum = self.requestNum > 0 ? self.requestNum - 1 : 0;
        if(self.requestNum == 0)
            requestFinished();
        
    

    func requestFinished()

这是第三层

class TableListViewController: LoadableController, UITableViewDelegate, UITableViewDataSource 

    var tableView           : UITableView?;
    var curPage             : Int = 0;
    var totalPage           : Int = 0;

    override func viewDidLoad() 
        super.viewDidLoad()
    

    override func initView() 
        super.initView();

        tableView = UITableView();
        tableView!.delegate = self;
        tableView!.dataSource = self;
        tableView!.delaysContentTouches = false;
        tableView!.canCancelContentTouches = true;
        self.view.addSubview(tableView!);
        tableView!.snp_makeConstraints  [unowned self](make) in
            make.edges.equalTo(self.view);
        

        let header = EGRefresh(refreshingTarget: self, refreshingAction: #selector(self.loadData));
        header.setImages(Global.LOADING_IMAGES, duration: 0.16, forState: .Idle);
        header.setImages(Global.LOADING_IMAGES, duration: 0.16, forState: .Pulling);
        header.setImages(Global.LOADING_IMAGES, duration: 0.16, forState: .WillRefresh);
        header.setImages(Global.LOADING_IMAGES, duration: 0.16, forState: .Refreshing);
        header.lastUpdatedTimeLabel.hidden = true;
        tableView!.mj_header = header;

        let footer = MJRefreshBackNormalFooter.init(refreshingTarget: self, refreshingAction: #selector(self.loadNext));
        tableView!.mj_footer = footer;
    

    func loadNext()
        tableView!.mj_footer.endRefreshing();
    

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell 
        let cell = tableView.dequeueReusableCellWithIdentifier("ListCell", forIndexPath: indexPath);
        return cell;
    

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
        return 1;
    

    func numberOfSectionsInTableView(tableView: UITableView) -> Int 
        return 1;
    

    override func requestFinished() 
        tableView!.mj_header.endRefreshing();
    

    override func didReceiveMemoryWarning() 
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    


    deinit
        DDLogInfo("TableListViewController deinit");
    

这里是tableview自动重新加载的地方。

import UIKit

class CircleViewController: TableListViewController 

    override func viewDidLoad() 
        super.viewDidLoad();
    

    override func initView()
        super.initView();

        self.title = "Circle";

        let items = ["One", "Two"];
        let segment = UISegmentedControl(items: items);
        segment.selectedSegmentIndex = 0;
        segment.setWidth(80, forSegmentAtIndex: 0);
        segment.setWidth(80, forSegmentAtIndex: 1);
        self.navigationItem.titleView = segment;

        tableView!.estimatedRowHeight = 50;
        tableView!.rowHeight = UITableViewAutomaticDimension;
//        tableView!.contentInset = UIEdgeInsetsMake(Dimens.TopBarHeight, 0, 0, 0);
        tableView!.registerClass(TextOnlyCell.self, forCellReuseIdentifier: "CircleTextOnlyCell");
        tableView!.registerClass(ImageAndPageCell.self, forCellReuseIdentifier: "CircleImageAndPageCell");

        Event.addEventListener(self, selector: #selector(self.goComment(_:)), name: EventType.CIRCLE_COMMENT, object: nil);
    

    func goComment(ns: NSNotification) 
        let commentView = PostCommentViewController();
        self.navigationController?.pushViewController(commentView, animated: true);
    

    func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat 
        return UITableViewAutomaticDimension;
    

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
        return 10;
    

    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) 
        tableView.deselectRowAtIndexPath(indexPath, animated: true);
    

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int 
        return 1;
    

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell 
        var cell = tableView.dequeueReusableCellWithIdentifier("CircleImageAndPageCell", forIndexPath: indexPath) as? ImageAndPageCell;
        if cell == nil 
            cell = ImageAndPageCell.init(style: .Default, reuseIdentifier: "CircleImageAndPageCell");
        
        let images = [UIImage(named: "b.jpg")!, UIImage(named: "a.jpg")!, UIImage(named: "c.jpg")!, UIImage(named: "a.jpg")!];
        cell?.initView(nil, nickname: "im a nickname", time: "10 min", content: NSMutableAttributedString(string: "asdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdf"), likeNum: 10, commentNum: 12, shareNum: 13, totalLine: 20, images: images, cellIndex: indexPath.row, hasPage: true, pageIcon: UIImage(named: "c.jpg")!, titleStr: "ahahaha");
        return cell!;
    

    override func loadData(complete: (() -> Void)?) 
        self.requestComplete();
    

    override func didReceiveMemoryWarning() 
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    

    deinit 
        Event.removeAllEventListener(self);
        DDLogInfo("CircleViewController deinit");
    

如果调用 goComment，

视图控制器将被推送，

然后tableview会跳到顶部，

我在 cellForRowAtIndexPath 中添加了一个断点，

它被调用了。

然后我尝试了presentviewcontroller，

这个问题也出现过，

即使我在外部 viewcontroller 中做了 presentviewcontroller。

---

好像没有重新加载数据，

它只是滚动到顶部。

【问题讨论】：

请向我们展示您的代码，以便我们以更好的方式帮助您。

@DiogoAntunes 我正在编辑我的帖子，请帮助，谢谢！

【参考方案1】：

它看起来像表格视图，没有考虑 uitoolbar 大小（44 点）

在 prepareForSegue 中保存 tableview 偏移量：（保存在 CGPoint 属性中）

self.tableViewScrollOffset = self.tableView.contentOffset;

然后，在 viewWillAppear: 中，检查它是否被修改过。如果是，请恢复它。

if(self.tableView.contentOffset.y != self.tableViewScrollOffset.y) [self.tableView setContentOffset:self.tableViewScrollOffset]; self.tableViewScrollOffset = CGPointZero;

【讨论】：

这似乎是从 ios 8.0 到 8.2 的错误