nstimer

How to run NSTimer in background beyond 180sec in iOS 7?

由 ＊爱你＆永不变心＊ 提交于 2019-11-26 09:52:34
问题 I have tried this but not working more than 180 sec in iOS 7 and Xcode 4.6.2. Please help me UIBackgroundTaskIdentifier bgTask = UIBackgroundTaskInvalid; UIApplication *app = [UIApplication sharedApplication]; bgTask = [app beginBackgroundTaskWithExpirationHandler:^{ [app endBackgroundTask:bgTask]; }]; NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:20 target:self selector:@selector(timerMethod) userInfo:nil repeats:YES]; [[NSRunLoop currentRunLoop] addTimer:timer forMode

NSTimer timerWithTimeInterval: not working

由 老子叫甜甜 提交于 2019-11-26 08:27:10
问题 I\'ve created a test application with timer before implementing it in my project. It was the first time I\'m using timer. But the issue is when I implemented timer using [NSTimer timerWithTimeInterval: target: selector: userInfo: repeats: ]; , it is not working. Here is my code, Interface: @interface uialertViewController : UIViewController { NSTimer *timer; } -(void)displayAlert; -(void)hideandview; @end Implementation: @implementation uialertViewController - (void)viewDidLoad { [self

How do I create a NSTimer on a background thread?

由 不羁岁月 提交于 2019-11-26 07:56:09
问题 I have a task that needs to be performed every 1 second. Currently I have an NSTimer firing repeatedly every 1 sec. How do I have the timer fire in a background thread (non UI-thread)? I could have the NSTimer fire on the main thread then use NSBlockOperation to dispatch a background thread, but I\'m wondering if there is a more efficient way of doing this. 回答1: The timer would need to be installed into a run loop operating on an already-running background thread. That thread would have to

Dynamically Updating a UILabel

由 一笑奈何 提交于 2019-11-26 07:49:47
问题 I have a question regarding UILabels. I\'m not even sure it is the right way to pull this off but I am trying to update a UILabel to display two numbers from 0 to 24 then loop back to zero and display the numer squence again. The catch is, it needs to update the UILabel every 1/24 of a second. Here is the code I have so far... -(void)viewDidLoad { fpsTimer = [NSTimer scheduledTimerWithTimeInterval: .01 target: self selector: @selector(updateFpsDisplay) userInfo: nil repeats: YES]; } - (void

How Do I write a Timer in Objective-C?

由 人盡茶涼 提交于 2019-11-26 07:26:47
问题 I am trying to make a stop watch with NSTimer. I gave the following code: nst_Timer = [NSTimer scheduledTimerWithTimeInterval:0.001 target:self selector:@selector(showTime) userInfo:nil repeats:NO]; and it is not working in milliseconds. It takes more than 1 millisecond. 回答1: Don't use NSTimer that way. NSTimer is normally used to fire a selector at some time interval. It isn't high precision and isn't suited to what you want to do. What you want is a High resolution timer class (using NSDate

Scheduled NSTimer when app is in background?

由 ∥☆過路亽．° 提交于 2019-11-26 03:07:43
问题 How do people deal with a scheduled NSTimer when an app is in the background? Let\'s say I update something in my app every hour. updateTimer = [NSTimer scheduledTimerWithTimeInterval:60.0*60.0 target:self selector:@selector(updateStuff) userInfo:nil repeats:YES]; When in the background, this timer obviously doesn\'t fire(?). What should happen when the user comes back to the app..? Is the timer still running, with the same times? And what would would happen if the user comes back in over an

How to Pause/Play NSTimer?

由 风格不统一 提交于 2019-11-26 02:57:45
问题 I need to start NSTimer by 0:0:0 that I am doing and I have a Pause button on click of that the timer has to pause after some time if a user clicks play it has to run from paused value of time. How can I pause and play in NSTimer? Any help? Thanks in advance. 回答1: Try this shizzle... worked great for me EDIT To be honest my actual code is this: -(IBAction)clicked:(id)sender { if ([startStop.titleLabel.text isEqualToString:@"Start"]) { [startStop setTitle:@"Pause" forState:UIControlStateNormal

ViewController.Type does not have a member named

由 对着背影说爱祢 提交于 2019-11-26 02:16:21
Just a simple task, but I'm in trouble. Trying to make a different way but it fails. How to init NSTimer with declared previously variable? Neither var nor let helps. The initial value of a property (in your case: timer ) cannot depend on another property of the class (in your case: interval ). Therefore you have to move the assigment timer = NSTimer(interval, ...) into a method of the class, e.g. into viewDidLoad . As a consequence, timer has to be defined as an optional or implicitly unwrapped optional . Note also that Selector(...) takes a literal string as argument, not the method itself.

How to run a method every X seconds

由 て烟熏妆下的殇ゞ 提交于 2019-11-26 01:14:04
问题 I\'m developing an Android 2.3.3 application and I need to run a method every X seconds . In iOS, I have NSTimer, but in Android I don\'t know what to use. Someone have recommend me Handler; another recommend me AlarmManager but I don\'t know which method fits better with NSTimer. This is the code I want to implement in Android: timer2 = [ NSTimer scheduledTimerWithTimeInterval:(1.0f/20.0f) target:self selector:@selector(loopTask) userInfo:nil repeats:YES ]; timer1 = [ NSTimer

ViewController.Type does not have a member named

由 橙三吉。 提交于 2019-11-26 01:09:44
问题 Just a simple task, but I\'m in trouble. Trying to make a different way but it fails. How to init NSTimer with declared previously variable? Neither var nor let helps. 回答1: The initial value of a property (in your case: timer ) cannot depend on another property of the class (in your case: interval ). Therefore you have to move the assigment timer = NSTimer(interval, ...) into a method of the class, e.g. into viewDidLoad . As a consequence, timer has to be defined as an optional or implicitly
订阅 nstimer