timer

问题 I need a timer so I used this code: timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(generalKnowledge.method), userInfo: nil, repeats: true) But I do not understand the #selector . I tried multiple times but it doesn't work. 回答1: selector() is where you'd add in the function that you want it to call every timeInterval you set. In your example it's every second. Do bare in mind that in Swift 4 and above, you need to add @objc before a function if you want to call

问题 I want to create a countdown timer which has 4 fields hours:minutes:seconds:milliseconds. I've gone through the following links before I posted this question.I don't know why should we have a hardcoded date and then subtract something from it. I'm not able to get the concept of Observable here. Time CountDown in angular 2 Angular 2 - Countdown timer Can someone please help me? This is what I've written from https://stackoverflow.com/a/40784539/4579897 private eventDate: Date = new Date(2018,

问题 Basically, I just want a timer that ''stops'' a function for 2 seconds between each step. I don't want it to call any other task/method, I just want it to pause execution. What's the best way of doing this? It's for a turn based battle sequence where the results of each turn are output to a JLabel (Turn 1: Character A hits character B for 8 damage. wait 2 seconds Turn 2: Character B's attack misses character A. wait 2 seconds etc.) //Battle///////////////////////// int aDmg = aAttackPower - d

问题 I need a one-time pause in this program for what I'm trying to do. I display some text in a Java Swing JFrame , repaint shows it, I wait 1.5 sec, then I change the text. Basically, I started with this: statusLabel.setText(s); appFrame.repaint(); Thread.sleep(1500); statusLabel.setText(y); appFrame.repaint(); But this wasn't working. Thread.sleep() would invoke before repaint had finished, meaning s would never be shown. I read a lot of places that you're not supposed to use Thread.sleep() in

问题 I have written a timer in vba in excel using application.ontime that makes a sound and gives a message box when an end time is reached. This works fine when the time is later in the same day, but when it goes to the next day the timer ends right away, as that time has already passed today. eg if the time is currently 7:00 pm and I want the timer to go off at 6:00 am tomorrow, then the timer goes off immediately because 6:00 am has already passed today. Is there any way of incorporating the

问题 I use UIDatePicker to implement a countdown timer.After loading view datePickerMode set CountDownTimer: - (void)viewDidLoad { [super viewDidLoad]; self.countDownTimer.datePickerMode=UIDatePickerModeCountDownTimer; } First,set the countdown time in UIDatePicker ,then press the button to start the countdown: - (IBAction)StartCountdown:(id)sender { [sender setTitle:@"Cancel" forState:UIControlStateNormal]; countDownInterval = (NSTimeInterval)countDownTimer.countDownDuration; remainder =

问题 I have the following code that will count the elapsed time and print the value in seconds after the user hits the stop button. Our first problem is that we are trying to get it to post the elapsed time in hours. So lets say the elapsed time is 20 mintues, the output would be .3 hours. Second, we are trying to get this value posted into a table inside of our created MySQL database. Its a int value in our table, just don't know how to post it there. Any help is appreciated! <script type="text

问题 I am creating an image slider and using a JavaScript timer to advance to the next picture. When the user clicks on the forward or back button (see picture below) the time the slide is displayed decreases greatly. I need help making the buttons advance the slide and reset the timer and the same time. I am attaching my JavaScript, HTML, and CSS to cover my code thoroughly. My JavaScript: var imageShown = 1; var total = 7; function autoplay() { var image = document.getElementById('picture');

问题 I have made a Timer Application in android.In application there are three (uneditable) EditText and a Button .When i press Button first time the timer in 1st EditText will start ,when i press it 2nd time the timer in 1st EditText will stop and at the same time the timer in 2nd EditText will be start,when i again press button same thing will be happened with 3rd EdtiText .NOw this code is working properly but when i press back button and again start it,its stopped working in 3rd EditText .The

问题 I'm fairly sure I understand how a swing timer works, I just cannot figure out how to apply it in my code. The way I apply it in my code doesn't allow it to draw because Graphics g is outside of its scope. import java.awt.*; import java.awt.event.*; import javax.swing.*; public class JayFrame extends JFrame { public JayFrame() { super("My Frame"); setContentPane(new DrawPane()); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(1200, 675); setResizable(false); setVisible(true); } class