tag:blogger.com,1999:blog-7064196Fri, 26 Jun 2026 14:53:55 +0000iOS DevelopmentC#BlogDesign PatternSQLWeb ToolsJavaScriptiPhone DevelopmentSwiftVIMXcodeASP.NETPowerShellWWDCHTMLWindows ToolsMacVisual Studio TipsiPhone ApplicationsObjective-CDojoOpen Source LibrariesWindowsHealthy LifeiOS TrainingVisual Studio ToolsVimperatorCSSExcelHTML SVGMVCOraclePythonREST web serviceSecuritymac Software UpdateBatch ScriptsCAB/SCSFCOVID-19StackOverflowUnit TestXMLjQuery.NetAJAXApple thingsC++InfoPathMathematicaOthersPL/SQLSproutCoreSubversionWolfram|AlphaXSLT XPathAndroidChatGPTCode ActivityDebugging with Xcode and LLDBEditorFunctional ProgrammingGoogle Chrome OSGoogle GOHarmonyOSInspirationNANTOPCPHPPodcastPrototypeRRSTapMyNotesVBAWMIWindows MobileYUILife is beautiful, and sharing is wonderful. Enjoy and share our programming lives!http://davidchuprogramming.blogspot.com/noreply@blogger.com (D Chu)Blogger409125tag:blogger.com,1999:blog-7064196.post-1401779515565563108Wed, 29 Oct 2025 23:13:00 +00002025-11-02T10:09:32.939-08:00iOS DevelopmentiPhone ApplicationsTapMyNotesBackground Story It all started with a conversation in a social group long time ago. We were discussing a tragic event — a moment that led us to reflect deeply on the meaning of life. I said something that surprised even myself: “I’ve written an iOS app. Maybe it could help people — maybe even save a life.” Someone asked, “Tea Director, what kind of app is it? Could you tell us more?” I smiled http://davidchuprogramming.blogspot.com/2025/10/my-ios-app-tap-to-capture-moments.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-5298564534062906035Sun, 25 May 2025 17:41:00 +00002025-10-29T16:17:21.382-07:00iOS DevelopmentiPhone DevelopmentXcodeiOS apps are built on a sandbox infrastructure, which normally makes it difficult to access the files within an app. However, as an iOS developer with an app on the App Store, I’ve found a way to view my app’s contents using the Xcode application. In Xcode, go to Window → Devices and Simulators to open the relevant window. You should see your connected iPhone there. In the Installed APPS panel, http://davidchuprogramming.blogspot.com/2025/05/accessing-ios-app-files.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-6166745309714908146Tue, 15 Apr 2025 21:11:00 +00002025-05-25T12:00:53.236-07:00 I have an iOS app listed on the Apple Store. For various reasons, I need to update my app regularly. For example, I have to ensure it keeps up with the constant release of new iOS frameworks, fix bugs discovered by users, and, most importantly, add new features that bring more value to users. In some of my past updates, I’ve had to make changes to the Core Data database, which involves schemahttp://davidchuprogramming.blogspot.com/2025/04/common-issue-for-updating-ios-app.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-7390836887980702992Wed, 09 Apr 2025 18:11:00 +00002025-04-15T15:46:23.525-07:00ChatGPTiOS DevelopmentSwift Recently, I had a very good conversation with ChatGPT about a topic that often goes unnoticed: how to name a variable in a Swift class in my iOS app. This isn't the kind of question you typically search for on Google or post on StackOverflow (where you might have to wait a day or longer for a response). Yet, I was stuck trying to find a meaningful name—one that clearly conveys its purpose and ishttp://davidchuprogramming.blogspot.com/2025/04/a-conversation-with-chatgpt.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-2287771367968383227Tue, 17 Dec 2024 22:04:00 +00002025-04-14T17:27:39.754-07:00HarmonyOSThe following is based on a note I wrote in WeChat. Recently, I got a Huawei P40 smartphone. The latest models on the market are the P70 series. Although the P40 is behind the newest models, I can still install HarmonyOS on it. This means I’ll have hands-on experience with Huawei’s new operating system. Based on my initial use of the P40, I find the phone and OS to be quite smooth http://davidchuprogramming.blogspot.com/2024/12/huawei-p40.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-4751235158829440040Tue, 11 Jun 2024 16:07:00 +00002024-06-11T09:47:13.295-07:00Web ToolsI use WeChat a lot for Chinese social network. Recently, I found a very good tool in WeChart, WeChart note. It is simple yet very handy. Basically it is for text note, but it has a range formats for text enhancement, such as bold, italic, underline, coloured background, and list. My favourate feature is that image can be embeded in the note. WeChat note is for user cloud uses. I can crate notes http://davidchuprogramming.blogspot.com/2024/06/wechat-and-long-image.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-2751024679473324718Thu, 28 Mar 2024 23:06:00 +00002024-03-28T16:06:22.579-07:00iPhone ApplicationsSwiftRecently, I noticed a minor issue after updating iOS. The scope bar did not appear when the search bar was activated. Typically, I prefer to display the scope bar simultaneously with the search bar activation. This allows users to select a scope item before searching. An Example Case Here is a snapshot. When I pull down the screen, only the search bar is displayed, but the scope bar is missing. http://davidchuprogramming.blogspot.com/2024/03/scope-not-shown-when-search-bar-is.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-4160629965186099665Thu, 22 Feb 2024 02:56:00 +00002024-03-26T15:44:58.695-07:00After Liu Qian's magic show at the Springs Festival Gala 2024, most people who participated in the game got expected results, but Xiao Ni (show anchor) did not make it. At that time, I thought this was a game with great possibilities for success. Soon, some people resolved the game and pointed out that this could be explained by a mathematical solution or method. Then I did further study on the http://davidchuprogramming.blogspot.com/2024/02/reveal-liu-qians-magic-card-game.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-1437638997860657213Wed, 14 Feb 2024 23:42:00 +00002024-02-21T20:42:29.689-08:00BlogOthersLiu Qian presented a magic card show at the Chinese Spring Festival TV Gala 2024. Like most magic shows, being interactive with the audience is a very popular way to make the show interesting. Liu's show was so amazing and well received that even audiants in front of TV could participate and get unexpected and unblievable results. I watched the show on YouTube. When I saw the amazing result, I http://davidchuprogramming.blogspot.com/2024/02/liu-qians-magic-card-show-in-tv-gala.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-3500075800014999150Mon, 29 Jan 2024 03:06:00 +00002024-01-28T19:06:32.653-08:00MacXcodeToday I found a very good article about how to compare two text files. This is a handy tool not only for developers, but also good for people who want to quickly find out diference between files. In the article, it mentioned 2 ways to access this tool. Actually, there is another very handy method to launch the app: Spotlight Search. Just press Cmd+space, then type FileMerge. The article explainshttp://davidchuprogramming.blogspot.com/2024/01/file-diff.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-1683545462987425594Tue, 01 Aug 2023 20:32:00 +00002023-08-01T13:41:19.757-07:00Apple thingsiOS DevelopmentWWDCApple's WWDC 2023 is over. In the past month, from Jun 6 to Jul 23, I have watched all videos published by Apple on the web. The following is a complete list of videos I have watched. Keynotes Platforms state of the union 17 big & little things at WWDC23 What Apple developers need to know at WWDC23 Add SharePlay to your app Bring widgets to new places Bring your game to Mac, Part 1: Make a game http://davidchuprogramming.blogspot.com/2023/08/wwdc23-video-sessions.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-3485955136252201704Thu, 18 May 2023 00:19:00 +00002023-05-17T17:22:35.316-07:00iOS DevelopmentSwiftXcodeRecently, I encountered a very frustrating crash issue in my iOS app. After I updated my Xcode to version 14.3, my app suddenly crashed right at the launch time. I could not find where the crash occurred, even thought I set a break point at the very beginning of my project code. I posted a question with my case on StackOverflow two days ago. That's the place where I normally try to get help from http://davidchuprogramming.blogspot.com/2023/05/xcode-143-and-navigation-bar-issue.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-1271088478214678738Sat, 10 Dec 2022 23:30:00 +00002022-12-10T15:30:12.057-08:00WWDCLast June, Apple hosted WWDC 2022 at its headquarters. Video sessions, from June 7 to 10, are available at the Apple developer site. As usual, I watched those videos in the past few months. Now I've finished watching all of them. The following are videos I watched. Monday Apple Design Awards Keynote Platforms State of the Union WWDC22 Day 1 recap Tuesday Add accessibility tohttp://davidchuprogramming.blogspot.com/2022/12/wwdc-2022-video-sessions.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-2469923541811587650Sat, 03 Sep 2022 19:49:00 +00002022-12-10T15:04:38.304-08:00iOS DevelopmentiPhone ApplicationsI have an iOS app. The main screen has a tabbar on the bottom with three tab bar items. Here I'll explain two related tabs. One of them, the “export” tab, is for displaying objects in a tableview. It allows the user to make multiple selections. Another one, the "edit" tab, is for editing objects. If a user makes any changes to objects, any previously selected object items in the export tab will http://davidchuprogramming.blogspot.com/2022/09/unselect-cell-in-tableview-if-cell-is.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-6375181042565568512Fri, 19 Aug 2022 15:09:00 +00002022-12-10T15:04:22.308-08:00iOS DevelopmentiPhone ApplicationsThe Core Data database is the most commonly used as a data store for iOS apps. Nobody could design the database once and never change it again. I occasionally need to make some changes or update my Core Data database. When the database scheme is changed, for example, adding a new entity, removing an entity, or changing entity fields, how could such kinds of changes affect your app? Would your apphttp://davidchuprogramming.blogspot.com/2018/09/ios-core-data-database-update.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-6456753201644914857Fri, 12 Aug 2022 17:10:00 +00002022-08-19T07:34:53.440-07:00HTMLiOS DevelopmentiPhone DevelopmentJavaScriptThis was a challenge for me to make Swift talk to JS or JS to Swift. I have been working on an iOS app for years. With so many years of practice, I think I am very good at a deep technical level. I have also done a lot of html and JS programming. What I know about JS is mainly based on what I need to do on my blog. In my app updates, what I need to do is to provide some information to users abouthttp://davidchuprogramming.blogspot.com/2022/08/build-bridge-between-swift-and-js.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-4448904856212955771Tue, 02 Aug 2022 22:34:00 +00002022-08-02T15:34:29.056-07:00HTMLiOS DevelopmentJavaScriptRecently, I have been busy working on my iOS updates. One feature I want to add is to provide some information views in the app. There are many ways to present information on display in an app. I could use a rich-text component or a text view with attributed strings. However, compared to HTML, I prefer to use a web viewer to display HTML content. The most recent update and recommended strategy byhttp://davidchuprogramming.blogspot.com/2022/08/html-head-settings.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-4816791804296610594Thu, 12 May 2022 23:52:00 +00002022-05-12T16:52:01.787-07:00C++iOS DevelopmentVIMRecently I have been working on my iOS app project. One thing I need to do is to update several blocks of codes in a code file. The update is to add directives #if...#endif to the matched block of codes. Those blocks of codes have very similar pattern: private func configureSearchControllerDelegates(_ sc: UISearchController) {    log.logMessage() {     &http://davidchuprogramming.blogspot.com/2022/05/update-block-of-codes-with-vim.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-3874858438370238791Fri, 18 Mar 2022 23:46:00 +00002022-03-19T14:46:53.588-07:00iOS DevelopmentVIMRecently I have interest in GPS location coordinates. In my TapToCount-3W iOS app, there is a feature to record location information for each tap. I have been puzzled by a scenarior for long time. For example, if I make several taps at same location, the GPS locations spead within a range, several tens of meters to meters apart, 30 meters or 8 meters as examples. Further invetigation, I found http://davidchuprogramming.blogspot.com/2022/03/removing-duplicated-lines-by-vim.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-865249217146023800Fri, 26 Nov 2021 21:12:00 +00002021-11-26T13:19:15.485-08:00iOS DevelopmentWWDCThis year Apple continued its WWDC online. The second time of the conference videos are much better than the last year. Each one is about less than one hour right on the topic. I waited one month after its finish. In this way, the video list is stable and complete. The following is the complete list I have watched. Add Intelligence to your widgets iOS, macOS Sep 11 AR Quick Look, meet Objecthttp://davidchuprogramming.blogspot.com/2021/11/wwdc-2021-videos.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-2331726601999302885Fri, 25 Sep 2020 15:32:00 +00002020-09-25T08:32:34.471-07:00iOS DevelopmentXcodeI updated my Xcode two days ago. After the update, I got a warning error about ToolChain failure:  /Library/Developer/Toolchains/swift-2.2-SNAPSHOT-2015-12-10-a.xctoolchain:1:1: failed to load toolchain: 'Version' parse error: Could not parse version component from: 'swift-2' There is no further explanation about this error in Xcode. After Google search, I found one solution. It seems that http://davidchuprogramming.blogspot.com/2020/09/xcode-120-and-toolchain-error.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-7523522495144279930Tue, 23 Jun 2020 19:05:00 +00002020-06-24T10:05:32.447-07:00COVID-19iOS DevelopmentWWDC WWDC2020 was launched this week. In the past, WWDC conferences were all held in US. This year, because of COVID19 and social distance rules，WWDC is the first time on virtual web. The greatest news is that all Apple registered developers are all able to attend the WWDC without paying expensive registration, travel and hotel fees. This is first time Apple trying virtual WWDC. On the first day, I http://davidchuprogramming.blogspot.com/2020/06/one-on-one-support-from-apple.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-8737570475987776738Tue, 21 Apr 2020 02:40:00 +00002020-04-20T19:40:18.999-07:00BlogHTMLtable HTML Tag has been in HTML for long time to show table-like layout. Now div is more powerful tag to display a block of text, and this can be used for table-like layout. The basic concept is to use css styles as a way to instruct div to show block of text in table-like layout. After search on web, I found a couple ways to use div, and I place the correspoding ccs styles in Blogger's http://davidchuprogramming.blogspot.com/2020/04/use-div-for-table-layout-in-html.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-4687496001808939499Sun, 05 Apr 2020 17:38:00 +00002020-04-20T19:18:03.142-07:00BlogCOVID-19HTMLVIMI have set up a blog at Blogger with more than one authors so that we can write our stories, observations about COVID-19. Some authors do not have any knowledge about HTML or how to write clean blogs there. As a result, the blogs they created contains massy HTML tags, either cause them frustration to edit text or inconsistent styles spreading blog text. I am tech support person working hardhttp://davidchuprogramming.blogspot.com/2020/04/use-vim-to-clean-up-html.htmlnoreply@blogger.com (D Chu)0tag:blogger.com,1999:blog-7064196.post-4103143043393298831Thu, 02 Apr 2020 02:57:00 +00002020-04-01T20:11:48.294-07:00BlogVIMI have a blog at Blogger. Recently my friends ask me if I could change the background color and increase font size for my posts. After search on web, soon I found solutions. Change Background Color First go to Theme, then Edit HTML. Expand line 9, b: skin section. Search for "post.background.color". You will find this as variable definition. In my Blogger, it is located at line 32http://davidchuprogramming.blogspot.com/2020/04/blogger-change-background-color-text.htmlnoreply@blogger.com (D Chu)0