Tag:delay time

  • iOS dispatch_ After delayed execution results in delayed dealloc


    Let’s build a new oneNewViewController, at the beginningViewControllerWrite the following code – (void)viewDidLoad { [super viewDidLoad]; UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom]; btn.frame = CGRectMake(100, 100, 100, 50); btn.backgroundColor = [UIColor brownColor]; [btn addTarget:self action:@selector(jump) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:btn]; } -(void)jump{ NewViewController *newVC = [[NewViewController alloc]init]; [self presentViewController:newVC animated:YES completion:nil]; } Then inNewViewControllerLi: -(void)dealloc{ NSLog(@”————–dealloc”); } – […]

  • Ruffian Heng: an introduction to the interrupt delay of embedded Cortex-M system and its measurement method


    Hello, I’m ruffian Heng, a serious technical ruffian. What ruffian Heng shared with you today isInterrupt delay of Cortex-M system and its measurement method。 In the embedded field, real-time is a concept that we often talk about. Here, real-time mainly emphasizes whether the system can respond and process within the specified time range when external […]

  • Ruffian Heng embedded: use GPIO module to measure the system interrupt delay time of i.mxrt1xxx


    Hello, I’m ruffian Heng, a serious technical ruffian. What ruffian Heng introduced to you today isi. System interrupt delay time of mxrt1xxx。 InIntroduction to Cortex-M system interrupt delay and its measurement methodIn this article, PI Ziheng introduced the basic concept of Cortex-M interrupt delay and a method to measure the interrupt delay time with GPIO […]

  • From DDR to DDR4, the memory core frequency index has not made much progress


    From the advent of DDR memory in 2001 to today in 2019, it has gone through four major specification times: DDR, DDR2, DDR3 and DDR4. The working frequency of memory has also evolved from 266MHz in the DDR era to 3200mhz today. This frequency is called speed in the operating system, equivalent frequency in memory […]

  • You said you would promise? Can you solve these five problems in the project?


    preface Hello, I’m Lin Sanxin,Speak the most difficult knowledge points in the most easy to understand wordsIt’s my motto,Foundation is the premise of advancedIt’s my original heart. As we all know, ha, Promise It is very important in our development. I think it is very important for Promise The use level of can be divided […]

  • Using CSS & Animation to realize the rotation chart


    <!– * @Author: [you name] * @Date: 2021-09-16 23:22:37 * @LastEditors: [you name] * @LastEditTime: 2021-09-16 23:29:02 * @Description: –> <!DOCTYPE html> <html lang=”en”> <head> <meta charset=”UTF-8″> <meta name=”viewport” content=”width=device-width, initial-scale=1.0″> < title > rotation chart < / Title > <style> * { margin: 0; padding: 0; list-style: none; } .wrap { width: 400px; height: […]

  • [hyperf] share enumeration classes that record common HTTP status codes


    Not to mention directly recording the code, some students may need it to save time <?php declare(strict_types=1); namespace App\Constants; use Hyperf\Constants\AbstractConstants; use Hyperf\Constants\Annotation\Constants; /** * @Constants */ class HttpCode extends AbstractConstants { /** * @Message(“OK”) *Respond to a successful get, put, patch, or delete operation. It can also be used for post operations that do […]

  • Blog recommendation | Apache pulsar delayed message delivery analysis


    Zhang Chao, the author of this article, was originally published in the official account of Tencent cloud. It has been reproduced and empowered, and has fine tuning compared with the original text. About Apache pulsar Apache pulsar is a top-level project of the Apache Software Foundation. It is a native distributed message flow platform for […]

  • The p7 boss of Ali shared the unknown skills of spring retry for the first time


    Today’s sharing begins. Please give us more advice~ External services are generally unreliable to callers, especially in the case of poor network environment, network jitter can easily lead to exceptions such as request timeout. At this time, it is necessary to use the failure retry strategy to call the API interface again to obtain. Retry […]

  • How to implement Python web page screenshots / screenshots / screenshots?


    For the problem of Python web page screenshots, after searching the Internet, the author summarizes the following implementation schemes, Using pyqt5 Using selenium + phantom JS The voice of the second method is relatively high. Generally speaking, it is not particularly convenient. Finally, the author found a third-party service provider that specializes in providing web […]

  • Blog recommendation | Apache pulsar delay message delivery analysis


    About Apache pulsar Apache pulsar is the top project of Apache Software Foundation. It is the next generation of cloud native distributed message flow platform. It integrates message, storage and lightweight functional computing. It adopts the architecture design of separation of computing and storage, supports multi tenant, persistent storage, multi machine room cross regional data […]

  • CSS3 animation


    Transition Transition property: Specifies the name of the CSS property that sets the transition effect. transition-property:width ,height; All means all the attributes. The default value is Transition duration: specifies how many seconds or milliseconds it takes to complete the transition effect. transition-duration The unit of time required is s sec MS MS 1s = = […]