Memory Leak in Titanium tabbed iPhone application

问题:

this has been giving me a headache for a couple weeks now -- hope somebody can help. I'm building an app for iOs 5.0, using the 2.1.4 SDK in Titanium mobile. My app pulls data from a database, and displays it in a scrollableview using labels and a table. I've noticed that it crashes after a while, and according to instruments, the views within the scrollableView, along with the labels and tableviews, are never released from memory. I use a lot of commonJS, and my code looks someting like this (stripped down):

The ApplicationWindow module, which I call from app.js

function ApplicationWindow(title) { var self = Ti.UI.createWindow({     title:title,     backgroundColor:'white' });  var button = Ti.UI.createButton({     height:44,     width:200,     title:L('openWindow'),     top:20 }); self.add(button);  var QuizWindow = require('/ui/common/QuizWindow');  button.addEventListener('click', function() {     //containingTab attribute must be set by parent tab group on     //the window for this work     qw = new QuizWindow({title: 'KCT', backgroundColor: 'white', navBarHidden: true, tabBarHidden: true});     self.containingTab.open(qw); });  return self; };  module.exports = ApplicationWindow; 

I then call the QuizWindow module:

function QuizWindow(args){ var instance = Ti.UI.createWindow(args); var QuestionView = require('/ui/common/QuestionView');  var db = Ti.Database.install("/kct.sqlite","kct"); var q = db.execute("SELECT * FROM questions");  var sv = Ti.UI.createScrollableView({     bottom: 40 });  while(q.isValidRow()){     var id = q.fieldByName("qid");     var question = q.fieldByName("q");     var set = q.fieldByName("set");     var info = q.fieldByName("info");      var v = new QuestionView(id,set,question,info);     sv.addView(v);     q.next(); }  q.close(); db.close();  var button = Ti.UI.createButton({     height:44,     width:200,     title:"Close",     bottom:10 });  button.addEventListener('click', function() {     instance.close({animation: true}); });  instance.add(sv); instance.add(button); return instance; }; module.exports = QuizWindow; 

and this is the QuestionView:

function QuestionView (id,set,question,infolert) { var qview = Ti.UI.createView({     top: 0,     width: 'auto',     height: 'auto',     backgroundColor: 'white',     questionSet: set,     questionID: id,     info: infolert,     isAnswered: false        });  var qLabel = gui.Header(question); qLabel.top = 5; qLabel.left = 10; qLabel.right = 10; qLabel.color = "#3B3B3B"; qLabel.font = {fontSize: gui.defaultFontSize+4, fontWeight: 'bold'};  var dcalc = (qLabel.text.length / 30) * ((gui.defaultFontSize+4)*1.2) + 5;  var answView = Ti.UI.createTableView({     backgroundColor: 'white',     top: dcalc,     _parent: qview });  var changeheight = function(e) {     var lheight = e.source.rect.height;     if(lheight && lheight > 10) answView.top = lheight + 5;     return; };  qLabel.addEventListener('postlayout', changeheight);   qview.add(qLabel); qview.add(answView);  return qview;  }  module.exports = QuestionView; 

I originally had some code in there to pull data for the answers from the database, and fill the tableView with that, but I removed it for the sake of brevity. Even without that, nothing gets released. I'm really at a loss here, any advice is appreciated.

回答1:

You can have a look at my Gist. By using this you can solve out the memory issue to great extend. Just include the class in your project and use it like this.

https://gist.github.com/3898340

var mem = new MemoryClean();     mem.clean(tableView);     mem.clean(headerView);     mem.clean(footerView);     mem = null; 

Here is what i have been using.

function openAppointments(e) {     var mem = new MemoryClean();     mem.clean(headerView);     mem.clean(footerView);     mem = null;     win.close(); } 

回答2:

In the end, I solved it. It was this:

var answView = Ti.UI.createTableView({     (...)     _parent: qview }); 

referencing the view in the answer table kept it, and all its children, from being released. Once I removed that, they get released simply by closing the window. Hope that's useful for someone.

文章来源: Memory Leak in Titanium tabbed iPhone application