How do I reset a countdown timer when it reaches 0? (Xcode 4)

Posted by Zac Prunty on Stack Overflow See other posts from Stack Overflow or by Zac Prunty
Published on 2011-11-21T07:13:34Z Indexed on 2011/11/21 9:50 UTC
Read the original article Hit count: 248

Filed under:

xcode4

|

timer

|

nstimer

|

countdown

first question and I have researched the heck out of this and can't seem to find any answers.

I would like to implement a countdown timer in my app that starts at 30 seconds and resets when it hits 0. It will count back by 1 second intervals. I have played around with the resources that Apple provides and I can't seem to implement the NStimer to do as I just explained. Are there any suggestions on how I could code this? I would eventually like to link this to a button that will start the timer when it is pressed. I appreciate any advice on this topic!

© Stack Overflow or respective owner

Related posts about xcode4

Is your Xcode4 stable?

as seen on Programmers - Search for 'Programmers'
I have upgraded to Xcode4, and I'm experiencing unbelievable situation. Xcode4 crashes per 5 minute. Incredibly slow. Almost impossible to use. Maybe the problem is my hardware configuration. I'm using MacBook Air 3rd with 2GB ram with SSD. It was just fine with Xcode3, but now, it consumes all of… >>> More
How-to build a droplet application in Xcode4?

as seen on Stack Overflow - Search for 'Stack Overflow'
In Xcode3 there used to be a template to build "Droplet" Applications (head/nibless apps that would throw whatever dropped at them at an "on open" Applescript method). In Xcode4 this template is unfortunately gone. What are the required steps to setup an xcode4 droplet project? modify the info… >>> More
Xcode 4 and cocos2D 1.0.0 beta Uncategorized errors and Info.plist doesn't exist

as seen on Stack Overflow - Search for 'Stack Overflow'
I just installed the xcode 4 sdk and the cocos2d 1.0.0 beta template. I just created a new project with the cocos2d template. But when I build I got these errors : (for information my previous projects developed with xcode 3 have the same problem) warning: couldn't add 'com.apple.XcodeGenerated'… >>> More
Managing Static Library project as a module like Framework on iOS project in Xcode4.

as seen on Stack Overflow - Search for 'Stack Overflow'
(Solution Note, I'll answer immediately) Many people including me trying to make a kind of Static Library framework for iOS to archive some kind of modularity. Framework is best way to do this, but it doesn't provided by Apple, and workarounds don't work well. https://github.com/kstenerud/iOS-Universal-Framework/tree/master/Fake%20Framework/Templates Fake… >>> More
Audio in xCode4.x is producing console warnings

as seen on Stack Overflow - Search for 'Stack Overflow'
While the app works, I am seeing pages of console log warnings when I'm running my app on the simulator. Even Apple's "LoadPresetDemo" sample app produces the same warning messages. I don't want to reproduce them all here (about 500 lines), but here are few. I would appreciate any insight into what's… >>> More

Related posts about timer

Scheduled task with windows services and system.timer.timer

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi i want implement a windows services scheduled task. I already created windows service. In a service i have implemented a timer.The timer is initialized at class interval. The timers interval is set in the start method of service and also it is enabled in the start method of the service. After timers… >>> More
System.Threading.Timer keep reference to it.

as seen on Stack Overflow - Search for 'Stack Overflow'
According to [http://msdn.microsoft.com/en-us/library/system.threading.timer.aspx][1] you need to keep a reference to a System.Threading.Timer to prevent it from being disposed. I've got a method like this: private void Delay(Action action, Int32 ms) { if (ms <= 0) { … >>> More
Threading.Timer vs. Forms.Timer

as seen on Stack Overflow - Search for 'Stack Overflow'
The short form of this question: When, if ever, is it appropriate to use the Forms.Timer in a multithreaded WinForms application? More specifically, I am architecting an application that uses multiple System.Threading.Timers to launch processes asynchronously, check queues containing the results… >>> More
How do I let main thread wait for the Timer.timer

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi I am using System.Timer.Timer I always get NULL after running my programme and it only works if I add this.sleep(6000). Suppose the reason is the main thread ends but the timer hasn't finished ... Here is the class and I call the class from my main form. Class class1 { string finalResult =… >>> More
System.Timers.Timer/Threading.Timer vs Thread with WhileLoop + Thread.Sleep For Periodic Tasks

as seen on Stack Overflow - Search for 'Stack Overflow'
In my application I have to send periodic heartbeats to a "brother" application. Is this better accomplished with System.Timers.Timer/Threading.Timer or Using a Thread with a while loop and a Thread.Sleep? The heartbeat interval is 1 second. while(!exit) { //do work Thread.Sleep(1000); } or myTimer… >>> More