Programmer Think

What is a circular reference ARC has been out for a long time. It is really convenient to automatically release memory, but it is not absolutely safe and will never cause memory leakage in the development and application of blind date app. An invisible killer that makes iOS objects unable to be released as expected is circular reference. Circu ...

Write in front 1. After iOS14, apple updated the extension component and introduced a new UI component: WidgetKit, but abandoned the Today Extension component of versions below iOS14; 2. The widgextension uses a new WidgetKit, which is different from the Today Widget. It can only be developed using SwiftUI, so SwiftUI and Swift foundation are ...

catalogue 1, Development environment 2, About Swift (1) Introduction to Swift (2) Swift properties (3) Conclusion 3, Swift basic syntax (1) Programming preparation (2) Hello,world! (3) Simple value 1. Variables and constants 2. String 3. Arrays, dictionaries, sets, and tuples 4. Optional type (4) Control flow 1. Conditional state ...

Write at the beginning Recently, the official account of React-native is the main attack. By the way, I will review the next React-native. Node.js And cross platform direction, architecture and Debug If you are interested in the proposal, we should recommend the following official account. https://mp.weixin.qq.com/s/RsvI5AFzbp3rm6sOlTmiYQ Of ...

Article directory char,unsigned char,uint8_t,uint16_t Summary Turn NSString uint8_t,uint16_t On the range of value char int Calculation method of value range sizeof() Some system macros Recommended reading char,unsigned char,uint8_t,uint16_t Summary Basics In C/C + +, char is used to de ...

When using external input method in email, the biggest problem is that when switching the email mode, there will be a delay for input, because you need to manually switch the input method to the corresponding English mode to use the shortcut keys normally. But if you use Emacs' own input function, you don't need to do these synchronizations. Yo ...

In the iOS development process or user feedback, you may often see this situation. When you use it, you will crash. When you check the crash stack in the background, you cannot find the crash log. In fact, most of this may be due to the system's low memory crash, that is, oom (another possibility is tha ...

There is a question: Write a function to input a number and output the original code, inverse code and complement code of the number At first, I didn't use the idea of bit operation, so I wrote the following long code: (suppose I type - 1754) #include <stdio.h> #include <math.h> int positive(int num) //Used to cal ...

Original link: http://www.cnblogs.com/riasky/p/3455228.html cocos2d-x 3.0 game development Xcode 5 handsome blog teaching 003.[HoldTail] game world and background screen The foreword I wrote to you, when I was learning cocos2d-x, I went ...

Homebrew Package manager [toc] I. Introduction Homebrew It is a package manager under Mac OS X, which is equivalent to yum and apt-get under Linux. Homebrew It is easy to download and install applications, and it is no longer necessary to search for various installation packages by hand. Be careful: Homebrew With Mac OS X MacPorts Package Mana ...