In Xcode，We give iOS platform App，Will inevitably have to add a button to bind an event，At this time there is a statement，You will find a button touch event already not before a "Touch Up Inside" so simple。
Referring to FIG title，There are at least not so much in some events can be for your choice，In more features at the same time，Novices may be more ignorant of the force?[……]
nRF24L01 is a work in the world-wide 2.4 ~ 2.5GHz ISM band single-chip wireless transceiver chip。Wireless transceiver comprising：Frequency generator、Enhanced mode controller SchockBurstTM、PA、Crystal Oscillator、Modulator、Demodulator。Set the output power and channel selection protocol can be set via the SPI interface。
Easy setup and low[……]
Arduino play on Mac，In addition to the official use of the simple addition of IDE，You can also choose to use Xcode to develop。
use embedXcode Plug-ins can make Xcode transformed into embedded development IDE，Including native compilation、Uploading full set of features。
but，In the standard library when it is a problem，For example, the[……]
In the process of writing the code，We will meet when the need to ensure that only one instance of the global，This time use the singleton pattern。
Single mode--this ensures that only one instance of a class，And provide a global point of access to。
What about how to implement the singleton pattern? We take a look at the classic Java code，How to implement the singleton pattern。
We had a quick search on the Internet "java singleton pattern" will be able to find[……]
we all know，For example, Swift 、 Python,，You do not need to declare a special variable type - although they are type-safe languages，But it can help you to dynamically infer the type of a variable in context。
Python do what you do，Write a name is the default declare a variable；And Swift，It is more close to our topic，It also uses[crayon-676d7[……]
Some time ago I wrote an article，SayIt is time to use the whitelist to the wallGot it，But that has expired long whitelist，It is not so smooth with the，Then I say boasted：I want to implement your own a reptile，Come crawling China's domain，Good update whitelist。
Ok，All in all this crawler is written on the line and then climb took more than ten thousand，But in the end I found the former to do a better solution，So the project was abandoned reptile[……]
When using Python to do network programming will inevitably encounter convert a string to the byte stream，Here we record the following commonly used methods：
First byte array to a string，That is str：
|
1 2 3 4 5 |
b = b'some byte array' str(b, encoding = "utf-8") #or bytes.decode(b) |
Then the string to a byte array：
[crayon-676d7b60935909326[……]
in most cases，People use the programming language is implicitly convert data types to determine whether a languageWeakly typedLanguage，For example, C。
In fact，For in addition to the more classic foreign language，Most other common languages Strong、Weak type could not tell - or，yesInconsistentof。So it will always be someone to argue。If we take as the basis for the concept of opening，Then the conflicts will appear：
比如 Pasc[……]
While our Web development，Would inevitably have to obtain data from the Web server，In many cases also need to submit the data to the server，Which at the moment，We are used to using JSON formatted data，Because it is easy，This time we look，How to use Swift to send JSON-RPC command and get response。
JSON-RPC is a stateless and lightweight[……]