nstimer

I am trying to send the user a 'Push Notification style' Alert when the user minimizes the app (by clicking on the iPhone's Home Button or by locking the phone as well). My app continuously parses an XML file (every 10 seconds) and I want the app to continue running so that it sends the user a Local Notification once some condition has been met in my program, even after the user has minimized the app or locked their phone. I've bounced around from tutorials and everyone seems to 'schedule' a Notification, but this isn't going to work for me because my Notification isn't time-based, rather it's

I have a NSTimer that fires with an interval of 3 seconds to decrease a value. When I do an action that increases that value, I want to restart the timer to count 3 seconds from that point. For example, if I increase the value and timer will fires in 1 second, I want to change that and make the timer fire in 3 seconds instead. Can I invalidate the timer and create it again? Or can I do it with setFireDate: , using the current date and adding an interval of 3 seconds? Yes, you can invalidate it. And create it again. You can also use: - (void) myTimedTask { // other stuff this task needs to do /

I'm making a game where I have a node that is spawning and falling from the top of the screen. However I want to make the nodes spawn at random time intervals between a period of 3 seconds. So one spawns in 1 second, the next in 2.4 seconds, the next in 1.7 seconds, and so forth forever. I am struggling with what the code should be for this. Code I currently have for spawning node: let wait = SKAction.waitForDuration(3, withRange: 2) let spawn = SKAction.runBlock { addTears() } let sequence = SKAction.sequence([wait, spawn]) self.runAction(SKAction.repeatActionForever(spawn)) The code for my

I have a functional countdown timer. The problem is that I need to continue the countdown when the user puts the app in the background. Or suspends the app? I am not sure what the correct terminology is to describe this action. In other words, the user opens the app and starts the countdown. The user should be able to use other apps but the countdown still operate. Also, the countdown should be able to run forever until it finishes or when the user terminates running the app. Here is the code for my timer: class Timer{ var timer = NSTimer(); // the callback to be invoked everytime the timer