大约有 2,451 项符合查询结果（耗时：0.0192秒） [XML]
- App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
1、UUID 背后的理念是，由于空间非常大（2^128，比宇宙中原子的估计数量还要多），随机选择两个 UUID 来标识事物时几乎不可能产生碰撞。如果您知道要连接的服务/特性，那么将它们编码到应用程序中是有意义的。如果您正在开...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
... version numbers are provided. Use this event to modify the database as required by the version change.
DatabaseOpened()
当数据库打开时，会触发此事件。
DatabaseUpgrade(oldVersion,newVersion)
This event fires when the database is upgraded. The previous and new version numbers a...
Css height in percent not working [duplicate]
...e that it may not work as expected on mobile where 100vh doesn't take some UI elements of the browser into account. This is especially annoying when you put something at the bottom of 100vh tall element.
– konrad
May 23 '19 at 10:17
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Remove border from buttons
... you bind the "click" event with a custom handler.
Frameworks like Jquery-UI or Bootstrap does this out of the box. Using one of them may ease a lot the whole application conception by the way.
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Infinity symbol with HTML
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∞
This does not require a HTML entity if you are using a modern encoding (such as UTF-8). And if you're not already, you probably should be.
share
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How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar
...ch results controllers: one for the normal display and another one for the UISearchBar's table view.
If you only use one FRC (NSFetchedResultsController) then the original UITableView (not the search table view that is active while searching) will possibly have callbacks called while you are search...
Build fat static library (device + simulator) using Xcode and SDK 4+
It appears that we can - theoretically - build a single static library that includes both simulator and iPhone and iPad.
10...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
... version numbers are provided. Use this event to modify the database as required by the version change.
DatabaseOpened()
当数据库打开时，会触发此事件。
DatabaseUpgrade(oldVersion,newVersion)
This event fires when the database is upgraded. The previous and new version numbers a...
ObservableCollection Doesn't support AddRange method, so I get notified for each item added, besides
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Scott Dorman is correct. Calling the built-in Add method will trigger something like 3 events per add (a NotifyPropertyChange for item count, NotifyPropertyChange for item indexing[] and an NotifyCollectionChanged event for the item added). To get the best perfor...
“VT-x is not available” when i start my Virtual machine [closed]
... For some reason, I was not able to edit the number of cores in the UI, since it was disabled. Had to edit the "*.vbox" of the corresponding image to change the cores to 1.
– deepak
Aug 16 '14 at 9:02
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