Tag：Relation
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Time：2021-12-27
A few weeks ago, I encountered a problem in judging and evaluating the number of stars, which led to a new concept, which I call control array for the time being.It is an alternative scheme when there are a large number of output ports associated with a large number of controls of the same type, […]
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Time：2021-12-26
On October 24,The 4th OLAP algorithm competition of AnalysysOfficially concluded, this competition is sponsored by ucloud, supported by technical media such as Sifu, InfoQ and CSDN. It lasted more than 40 days and experienced many links such as competition registration, test experience and formal competition,Krypton letter team, volcanic soy sauce team, Qianqian teamStand out and […]
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Time：2021-12-24
Non main thread UI Hook uiview has the following three methods: setNeedsLayout setNeedsDisplay setNeedsDisplayInRect Judge whether it is currently in the main thread. If not, use dispatch_ Async (dispatch_get_main_queue(), ^ {/ / call the original method});, This method can’t cover completely for the time being Access field pointer Hook the allocwithzone method of nsobject to […]
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Time：2021-12-24
We often use join related statements for association queries. What happens to the results of on combined with and and where after the join connection method? When using join on, pay attention to the difference between and where and how to use it join on andThe join on and method is similar to on condition […]
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Time：2021-12-24
Introduction: kubernetes monitoring is based on the kubernetes container interface and underlying operating system under application monitoring. It is an integrated solution for end-to-end observability of kubernetes cluster software stack. In kubernetes monitoring, you can see the observation data of all associated layers at the same time. We hope that through a series of best […]
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Time：2021-12-23
Two special types of SVC Headless Service Headless ServiceSometimes load balancing and separate service IP are not required or desired. In this case, you can create a headless service by specifying the value of cluster IP (spec.clusterip) as “None”. Such services will not be assigned cluster IP, Kube-The proxy will not handle them, and the […]
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Time：2021-12-16
1. Linux incoming parameter processing Before introducing how to use the getopt function to handle the incoming parameters of the application, let’s take a look at how the application written in the Linux environment handles the incoming parameters When writing an application in Linux environment, the main function generally has two parameters, which are used […]
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Time：2021-12-11
1、 Classification 1. What is the role of classification?Declare private methods, decompose large class files, and expose the private methods of the framework 2. Classification characteristicsAt runtime, you can add classifications to system classes. 3. What can be added to the classification?Instance method, class method, protocol, property (add getter and setter methods, there is no […]
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Time：2021-12-11
docker-compose https://docs.docker.com/compose/ Two important concepts:Service: an application container can actually contain several container instances running the same image Project: a complete business unit composed of a group of associated application containers, which is located in docker-compose.com YML file definition =====pre=====install docker vi /etc/sysctl.conf net.ipv4.ip_forward = 1 =====install=====curl -L “https://github.com/docker/compose/releases/download/1.28.5/docker-compose-$(uname -s)-$(uname -m)” -o /usr/local/bin/docker-composechmod +x /usr/local/bin/docker-composeln […]
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Time：2021-12-10
Git GiteeAs we all know, the domestic visit to GitHub is slow, which affects our use. If you want to experience git’s flying speed, you can use gite (gitee. Com), a domestic git hosting service. Gitee provides a free git warehouse and integrates functions such as code quality detection and project demonstration. For team collaborative […]
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Time：2021-12-8
Pay attention to the warehouse and get updates in time:iOS-Source-Code-Analyze Follow: Draveness · Github In IOS development, we often need to use category to add attributes to existing classes, but [email protected] be in categorycorrectCreate instance variables and access methods. However, we can realize the above requirements through the associated object in the Objective-C runtime, that […]
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Time：2021-12-4
LINQ yes Language INtegrated Query is the acronym of the word, which translates into language integration query. It provides a consistent model for querying data across various data sources and formats, so it is called integrated query. Because this query does not create a new language, but is only implemented on the […]
