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MIT于2026元旦已发布v2.77版本：更新非常有限，lamda 表达式（匿名函数）缺...
...用于在您自己的设备上进行临时安装，也可用于提交到 Apple App Store。
注意：您需要一个 Apple 开发者帐户。
来源：https://appinventor.mit.edu/ai2/ReleaseNotes.html
- App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
手动同步用 信息分享器 组件。
自动实时同步只能走云端，上报到你自己的服务器或者微数据库等，另一个 app 定时拉取。
还可以用云数据库接 redis，数据变动有实时通知，不用定时拉取。
How to change default timezone for Active Record in Rails?
In my application.rb I came across the following comment
10 Answers
10
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Xcode 4 - “Valid signing identity not found” error on provisioning profiles on a new Macintosh insta
I had a Macintosh I used to develop iPhone apps with using XCode 4.
I now have a new Macintosh with a new install of... everything.
...
S3 Static Website Hosting Route All Paths to Index.html
I am using S3 to host a javascript app that will use HTML5 pushStates. The problem is if the user bookmarks any of the URLs, it will not resolve to anything. What I need is the ability to take all url requests and serve up the root index.html in my S3 bucket, rather than just doing a full redirect. ...
Good examples of MVVM Template
...azine article where the concepts are similar but uses a slightly different approach and still lack in any complexity. Are there any decent MVVM examples that at least show basic CRUD operations and dialog/content switching?
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Dilemma: when to use Fragments vs Activities:
I know that Activities are designed to represent a single screen of my application, while Fragments are designed to be reusable UI layouts with logic embedded inside of them.
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What are the use-cases for Web Workers? [closed]
...h you wouldn’t want to block your code editing whilst you’re using the app.
From Mozilla: One way workers are useful is to allow your code to perform processor-intensive calculations without blocking the user interface thread.
As a practical example, think of an app which has a large table of ...
How to get the screen width and height in iOS?
...he screen, even in split screen mode. When you use split screen mode, your app's window changes. If the code above doesn't give you the information you expect, then like the OP, you're looking at the wrong object. In this case, though, you should look at the window instead of the screen, like this:
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ASP.NET MVC - Attaching an entity of type 'MODELNAME' failed because another entity of the same type
In a nutshell the exception is thrown during POSTing wrapper model and changing the state of one entry to 'Modified'. Before changing the state, the state is set to 'Detached' but calling Attach() does throw the same error. I'm using EF6.
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