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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
... 【Socket】 ClientSocketAI2Ext 拓展加强版：TCP/IP传输协议
【FTP】 FTP 客户端拓展：FTP协议连接、上传、下载、创建、修改目录等
【短信平台接入】 AliSms 拓展：阿里云短信平台接入，短信验证码
【设备信息】 PhoneInfo 拓展：获取...
What is the purpose of “&&” in a shell command?
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Good in REPL, but for scripts I would prefer set -o errexit for Bash.
– Franklin Yu
Feb 11 '17 at 11:38
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Can you attach a UIGestureRecognizer to multiple views?
...: WARNING: A Gesture recognizer (<UITapGestureRecognizer:.....>) was setup in a storyboard/xib to be added to more than one view (-><UIView: ; frame = (0 44; 600 536); autoresize = RM+BM; gestureRecognizers = <NSArray...: >; layer = <CALayer: ...>>) at a time, this was nev...
how to make a specific text on TextView BOLD
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Just build your String in HTML and set it:
String sourceString = "<b>" + id + "</b> " + name;
mytextview.setText(Html.fromHtml(sourceString));
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Initializing a struct to 0
...t(involves less typing), and it is guaranteed to work, all members will be set to 0[Ref 1].
The second is more readable.
The choice depends on user preference or the one which your coding standard mandates.
[Ref 1] Reference C99 Standard 6.7.8.21:
If there are fewer initializers in a ...
Given a view, how do I get its viewController?
...cumentation for nextResponder:
The UIResponder class does not store or set the next responder automatically, instead returning nil by default. Subclasses must override this method to set the next responder. UIView implements this method by returning the UIViewController object that manages it (i...
Do you have to include ?
... or if you don't have the favicon.ico in root folder but in e.g. a assets folder
– Upvote
Feb 27 '14 at 11:59
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In a Git repository, how to properly rename a directory?
...):
git mv <old name> <new name>
Case sensitive rename—eg. from casesensitive to CaseSensitive—you must use a two step:
git mv casesensitive tmp
git mv tmp CaseSensitive
(More about case sensitivity in Git…)
…followed by commit and push would be the simplest way to rename a...
Why is iterating through a large Django QuerySet consuming massive amounts of memory?
...te C was close, but not quite.
From the docs:
You can evaluate a QuerySet in the following ways:
Iteration. A QuerySet is iterable, and it executes its database query the first time you iterate over it. For example, this will print the headline of all entries in the database:
for e in ...
Scaling Node.js
... redis when used with hiredis.
PING: 20000 ops 46189.38 ops/sec 1/4/1.082
SET: 20000 ops 41237.11 ops/sec 0/6/1.210
GET: 20000 ops 39682.54 ops/sec 1/7/1.257
INCR: 20000 ops 40080.16 ops/sec 0/8/1.242
LPUSH: 20000 ops 41152.26 ops/sec 0/3/1.212
LRANGE (10 elements): 20000 ops 36563.07 ops/sec 1/8/1...