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[基本解决]swift中在UITableView顶部显示正在加载的指示

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swift show loading indicator table view top

swift – Place activity indicator over uitable view – Stack Overflow

ios – How to show activity indicator while tableView loads? – Stack Overflow

IOS: ActivityIndicator over UITableView… How to? – Stack Overflow

Displaying an Activity Indicator while Loading Table View Data – DZone Mobile

swift table view top  show loading indicator

swift   scroll top show indicator

swift  uitableview scroll top show indicator

用代码:

  func updateIndicator(){

        gLog.debug("self.stateInfo.curState=\(self.stateInfo.curState)")

        if self.stateInfo.curState == .WaitingMessage {

            //add loading indicator

            var curTvContentOffset = self.messageTableView.contentOffset

            gLog.debug("curTvContentOffset=\(curTvContentOffset)")

           

            UIView.setAnimationsEnabled(false)

           

            curTvContentOffset.y += LoadingIndicatorHeight

            gLog.debug("tableViewContentOffset=\(curTvContentOffset)")

           

            loadingIndicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray

            //for debug

            loadingIndicatorView.backgroundColor = UIColor.greenColor()

            

            self.messageTableView.addSubview(loadingIndicatorView)

            constrain(loadingIndicatorView) {aiView in

                aiView.centerX == aiView.superview!.centerX

                aiView.top == aiView.superview!.top + LoadingIndicatorHeight / 2

                aiView.height == LoadingIndicatorHeight

            }

            UIView.setAnimationsEnabled(true)

            self.messageTableView.setContentOffset(curTvContentOffset, animated: false)

           

            loadingIndicatorView.startAnimating()

        } else if self.stateInfo.curState == .NormalView {

            //remove loading indicator

            loadingIndicatorView.stopAnimating()

            loadingIndicatorView.removeFromSuperview()

           

            gLog.debug("TODO: wait to add new messages")

        }

    }

虽然可以显示:

但是是:

在TableView的上面,而不是顶部新增加的区域显示的加载指示器

现在问题转化为:

如何给tableview顶部增加显示区域(而不增加的是tableviewcell)

swift  uitableview scroll top show more view

swift  表格 滚动顶部 增加显示区域

ios – UITableView – scroll to the top – Stack Overflow

Scrolling the Scroll View Content

swift tableview load more

ios – Load More After Coming to Bottom of UITableView – Stack Overflow

ios – UITableView load more when scrolling to bottom like Facebook application – Stack Overflow

之前是把上述代码加到viewWillAppear中的

而之前tableview的cell,是先于此处的indicator显示的,所以有问题,

[已解决]tableview中setContentOffset不工作

最后用:

            UIView.setAnimationsEnabled(false)

           

            loadingIndicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray

            loadingIndicatorView.hidesWhenStopped = true

            loadingIndicatorView.frame = CGRectMake(0, 0, self.messageTableView.frame.width, LoadingIndicatorHeight)

            self.messageTableView.addSubview(loadingIndicatorView)

            self.messageTableView.tableHeaderView = loadingIndicatorView

            UIView.setAnimationsEnabled(true)

           

            //for debug

            loadingIndicatorView.backgroundColor = UIColor.greenColor()

           

            loadingIndicatorView.startAnimating()

暂时实现了类似的效果:

整理后的代码:

    override func viewWillAppear(animated: Bool) {

        super.viewWillAppear(animated)

       

        //…

        updateIndicator()

    }

    func updateIndicator(){

        gLog.debug("self.stateInfo.curState=\(self.stateInfo.curState)")

        if self.stateInfo.curState == .WaitingMessage {

            //add loading indicator

            UIView.setAnimationsEnabled(false)

            loadingIndicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray

            loadingIndicatorView.hidesWhenStopped = true

            loadingIndicatorView.frame = CGRectMake(0, 0, self.messageTableView.frame.width, LoadingIndicatorHeight)

            //self.messageTableView.addSubview(loadingIndicatorView)

            self.messageTableView.tableHeaderView = loadingIndicatorView

            UIView.setAnimationsEnabled(true)

           

            loadingIndicatorView.startAnimating()

        } else if self.stateInfo.curState == .NormalView {

            //remove loading indicator

            loadingIndicatorView.stopAnimating()

            loadingIndicatorView.removeFromSuperview()

           

            gLog.debug("TODO: wait to add new messages")

        }

    }

效果:

其中,此处的viewWillAppear,在cell显示(cellForRowAtIndexPath)之后才执行的。

-》

也不影响顶部的tableview的header多余空间。

转载请注明:在路上 » [基本解决]swift中在UITableView顶部显示正在加载的指示

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