nstimer

问题 I'm trying to display an array of numbers in a UILabel using a timer,and show them in the order set in the array, but I only receive the Title in the format and then a SIGABRT ! any suggestions...Thanks Part of the code with problems! -(IBAction) rotate3 { NSString *number = [dayArray initWithArray:(NSArray *)dayArray]; NSArray *array = [[NSArray alloc] initWithObjects: @"0", @"1", @"2", @"3", @"4", @"5" ,@"6", @"7", @"8",@"9",@"10",@"11",@"12",@"13", @"14", @"15", @"16", @"17", @"18", @"19"

问题 I made a practice project in Swift to learn how NSTimer works. There is one button to start the timer and one button to invalidate it. It works fine when I tap each button once. However, when I tap the start timer button multiple times, I am no longer able to invalidate it. Here is my code: class ViewController: UIViewController { var counter = 0 var timer = NSTimer() @IBOutlet weak var label: UILabel! @IBAction func startTimerButtonTapped(sender: UIButton) { timer = NSTimer

问题 Bear with me I picked up Swift and Xcode a week ago (Im creating an app to learn Swift during my holidays) I created a timer using scheduledTimer to act as an stopwatch. The seconds and minutes are running fine but I can't get the hours to work. What am I doing wrong? currentTime = 0 timer = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { _ in self.currentTime += 1 let hoursPortion = String(format: "%02d", CGFloat(self.currentTime) * 60) let minutesPortion = String(format: "%02d"

问题 I'm trying to learn about NSTimer , using Foundation and printing to the console. Can anybody tell me what I need to do to get the following to work? It compiles with no errors, but does not activate my startTimer method -- nothing prints. My aim is to get one method to call another method to run some statements, and then stop after a set time. #import <Foundation/Foundation.h> @interface MyTime : NSObject { NSTimer *timer; } - (void)startTimer; @end @implementation MyTime - (void)dealloc {

问题 I want to add a mute button to my app that when the user clicks it, he chooses a duration of the mute and while the mute is enabled the user won't get notifications from my app. I thought NSTimer is a good option, but how can I make a timer with it? And how can I set that the timer will run in the background aswell? Note: I'm using location monitoring in the background. 回答1: I don't think you need a running timer in the background - or any complicated solution: Use a timer when your app is in

问题 I have tried many approaches that I have found in other questions and any of them are working. My problem is that the timer is not calling selector class MyViewController: UIViewController{ var progressBarTimer = NSTimer() @IBOutlet weak var progress_bar: UIProgressView! override func viewDidLoad() { self.progress_bar.progress = 0 self.progressBarTimer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: #selector(MyViewController.updateProgress(_:)), userInfo: nil, repeats:

问题 I have the following method to update a label which show a simple time up -(void)updateTimeLabel:(NSTimer *)timer{ NSInteger secondsSinceStart = (NSInteger)[[NSDate date] timeIntervalSinceDate:_startTime]; NSInteger seconds = secondsSinceStart % 60; NSInteger minutes = (secondsSinceStart / 60) % 60; NSInteger hours = secondsSinceStart / (60 * 60); NSString *result = nil; if (hours > 0) { result = [NSString stringWithFormat:@"%02d:%02d:%02d", hours, minutes, seconds]; } else { result =

问题 I have a label and its value is "03:48". I want to countdown it like a music player. How can I do that? 03:48 03:47 03:46 03:45 ... 00:00 var musictime =3:48 func stringFromTimeInterval(interval: NSTimeInterval) -> String { let interval = Int(interval) let seconds = interval % 60 let minutes = (interval / 60) return String(format: "%02d:%02d", minutes, seconds) } func startTimer() { var duration=musictime.componentsSeparatedByString(":") //split 3 and 48 var count = duration[0].toInt()! * 60

问题 I m writing ios app on 4.3 simulator and 3.2 xcode The app every minute with timer NSTimer checks news on some websites and if there are news, the app will make alert message with sound "There are something new on ... website!" But if i close app or it goes to sleep, timer stops on background. So, i have read many articles like http://www.codeproject.com/Articles/124159/Hour-21-Building-Background-Aware-Applications How keep NSTimer when application entering background? and non of them helped

问题 I want to run a selector using NSTimer which contains some network calls and some other tasks. I want to do that on global queue. dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ NSTimer * myTimer=[[NSTimer alloc]init]; myTimer = [NSTimer timerWithTimeInterval:10*60 target:self selector:@selector(syncGroupAutomatically) userInfo:nil repeats:YES]; [[NSRunLoop currentRunLoop] addTimer:myTimer forMode:NSRunLoopCommonModes]; [[NSRunLoop currentRunLoop] run]; }); -