In iOS development，We often use Timer This class，For some repeat or delayed call。
but，In actual use，If you are used to periodically update the UI，Will be found Timer The calls are often blocked by other operations can not update the UI lead to normal。
For example, in my HourlyMeow project，Custom Clock[……]
1995.10.09 – 2018.06.03[……]
https://www.youtube.com/watch?v = bg6QV2JEPvI
Always liked Jannine Weigel，This song has recently been brain worm，And later recommended to the female vote，She asked me to translate ...... Well，A long time have not translated lyrics，Then the song lyrics and no Chinese，So I simply translated a bit， "Deep end" there broke out in the English language、Crazy meaning，So inside the lyrics can be understood as "walk the edge of collapse"? In short this is probably a pun。[……]
Woman sent me a ticket Cherry MX Borad 8.0! Yes，That is a rare manufacturers that need a 9.5 H CNC milling machineAnodizing 87 Key mechanical keyboard! Apple external keyboard and a design style，Coupled with a specially designed key caps font，I fell in love with at first sight to see(Incidentally blown about，This is what I often sayDesign three elementsIn the "visceral design")
but，Manufacturers are customers can design，I like this small minority are basically not be considered in，then，In addition to hand happy or outsideHappyGo pondering[……]
When carrying out the development of iOS macOS，We often need to interact and file，For example, association and open a certain type of file，Well, this time，Your name suffix used in this document are not，But it's UTI。
UTI is a unified file type name，It sets out what should be a file type，Rather than suffixes to determine，For example, txt，text，json are plain text files，They are public.text
Then，usually，For the well-known file types，You can go toApple's official page[……]
With the wrong default environment is not terrible，Well matched back like a big deal。
Obviously，He says such things there is no story。
Anyway，If you find that your vps One day suddenly can not log in，The content is not being given no authority，But the certificate is to determine the right - then you might be wrong with the last exit before the shell。At this time, even if you use the console to log on，After logging will find immediately flashed back to the login screen - finished，You thought，Just with a good environment, we have to do it all again。
use chsh Silent switch[……]
existAfter purchasing a VPS you should spare security measuresAs we mentioned with fail2ban To protect ssh ，So even without changingsshPort (default is22），Also can be done to avoid brute force password，of course，We have opened the credentials to log in and closed the ssh password login option，But with fail2ban Kill those who keep trying to make us feel bot is also a pleasant thing。
In fact，apart from Use fail2ban Bind9 be used to prevent DNS amplification attacksouter，We can also[……]
In iOS 10 after，iOS uses a new
UserNotifications As the notification API，This allows developers to use images、video、Sound and other rich media content as the notification，While further，You can also use the Notification Content Extension Size customize the content and layout of notice。
If you are self-defined tone notification，Then you can give [cray[……]
When restoring data，You may need to use U disk copy data，But macOS default is read-only mount ntfs，of course，We have a way to use the command line to become re-mount it read-write。But this is likely to cause ntfs permission error，The result is that when plugged into another computer's，This file mayGrayed：
If you use this time to force it open decompression software，Then you will get a similar error：
Item “xxx” is used by macOS and canno[……]