You want a date formatter. Here’s an example: NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat:@”dd-MM-yyyy HH:mm”]; NSDate *currentDate = [NSDate date]; NSString *dateString = [formatter stringFromDate:currentDate];
In Swift 5.1 this will work: var counter = 30 override func viewDidLoad() { super.viewDidLoad() Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(updateCounter), userInfo: nil, repeats: true) } @objc func updateCounter() { //example functionality if counter > 0 { print(“\(counter) seconds to the end of the world”) counter -= 1 } }
You need to define the method in the target. Since you set the target as ‘self’, then yes that same object needs to implement the method. But you could have set the target to anything else you wanted. userInfo is a pointer that you can set to any object (or collection) you like and that … Read more
If you need this so timers still run when you scroll your views (or maps), you need to schedule them on different run loop mode. Replace your current timer: [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(timerFired:) userInfo:nil repeats:YES]; With this one: NSTimer *timer = [NSTimer timerWithTimeInterval:0.5 target:self selector:@selector(timerFired:) userInfo:nil repeats:YES]; [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes]; For details, check this … Read more
You can have any class interested in when the app goes into the background receive notifications. This is a good alternative to coupling these classes with the AppDelegate. When initializing said classes: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appWillResignActive:) name:UIApplicationWillResignActiveNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appWillTerminate:) name:UIApplicationWillTerminateNotification object:nil]; Responding to the notifications -(void)appWillResignActive:(NSNotification*)note { } -(void)appWillTerminate:(NSNotification*)note { [[NSNotificationCenter defaultCenter] … Read more
An easy & simple to implement solution is to do: NSTimer *timer = [NSTimer timerWithTimeInterval:… target:… selector:…. userInfo:… repeats:…]; [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
For anyone else that ends up here: To determine if a UIView is onscreen somewhere, rather than checking superview != nil, it is better to check if window != nil. In the former case, it is possible that the view has a superview but that the superview is not on screen: if (view.window != nil) … Read more
The solution you will use really depends on how long you need to wait between each execution of your function. If you are waiting for longer than 10 minutes, I would suggest using AlarmManager. // Some time when you want to run Date when = new Date(System.currentTimeMillis()); try { Intent someIntent = new Intent(someContext, MyReceiver.class); … Read more
This will work: override func viewDidLoad() { super.viewDidLoad() // Swift block syntax (iOS 10+) let timer = Timer(timeInterval: 0.4, repeats: true) { _ in print(“Done!”) } // Swift >=3 selector syntax let timer = Timer.scheduledTimer(timeInterval: 0.4, target: self, selector: #selector(self.update), userInfo: nil, repeats: true) // Swift 2.2 selector syntax let timer = NSTimer.scheduledTimerWithTimeInterval(0.4, target: self, … Read more
Firstly I’d like to draw your attention to the Cocoa/CF documentation (which is always a great first port of call). The Apple docs have a section at the top of each reference article called “Companion Guides”, which lists guides for the topic being documented (if any exist). For example, with NSTimer, the documentation lists two … Read more