#nstimer

[justkinggames]

Week 2 Day 7 Genre: Tower Defense

So my second week has come to an end, and I am so incredibly proud of the product I have managed to build this week.  The art and sound is certainly some of the best I’ve done, and I am excited at the thought of coming back to this project down the road.  It has so much potential and is so well organized that I am delighted at the thought of returning to it.

Also, for anyone who is working with swift it is so very, very CRITICALLY IMPORTANT TO INVALIDATE NSTIMERS BEFORE TRANSITIONING SCENES.  Within about fifteen minutes of just letting my game run the fps dropped from 40 to 0.5 and it was taking over 3 GB of memory.  THAT IS NOT NORMAL.

Well I’m gonna submit now and then pull my next genre.

Wish me luck :)

[goodanswerbiz]

Fixed How do I use NSTimer? #dev #it #asnwer

Fixed How do I use NSTimer? #dev #it #asnwer

How do I use NSTimer?

How do I use an NSTimer? Can anyone give me step by step instructions?

Answer: How do I use NSTimer?

Something like this:

NSTimer *timer; timer = [NSTimer scheduledTimerWithTimeInterval: 0.5 target: self selector: @selector(handleTimer:) userInfo: nil repeats: YES];

Answer: How do I use NSTimer?

Firstly I’d like to draw your attention to the Cocoa/CF documentation (which…

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[sevennet-blog]

How to: How do I use NSTimer?

How to: How do I use NSTimer?

How do I use NSTimer?

How do I use an NSTimer? Can anyone give me step by step instructions?

Answer: How do I use NSTimer?

Something like this:

NSTimer *timer; timer = [NSTimer scheduledTimerWithTimeInterval: 0.5 target: self selector: @selector(handleTimer:) userInfo: nil repeats: YES];

Answer: How do I use NSTimer?

Firstly I’d like to draw your attention to the Cocoa/CF documentation (which…

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[dainfagerholm]

XCode Tipp - Timer

NSTimer *_timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(onTimer) userInfo:nil repeats:YES]; - (void) onTimer {     NSLog(@"TIMER"); } stop: [_timer invalidate];

[cocoa]

Weak timer targets

Don't forget that NSTimer retains its target, meaning you're going to be introducing a retain cycle if your NSTimer's target is also the object that retains the NSTimer. You can get around this by creating a proxy delegate object which holds a weak reference to the real target object, as suggested in this Stack Overflow answer:

@interface TMWeakTimerTarget : NSObject - (instancetype)initWithTarget:(id)target selector:(SEL)selector; - (void)timerDidFire:(NSTimer *)timer; @end @interface TMWeakTimerTarget() @property (nonatomic, weak) id target; @property (nonatomic) SEL selector; @end @implementation TMWeakTimerTarget #pragma mark - Initialization - (instancetype)initWithTarget:(id)target selector:(SEL)selector { if (self = [super init]) { _target = target; _selector = selector; } return self; } - (id)init { return [self initWithTarget:nil selector:nil]; } #pragma mark - TMWeakTimerTarget - (void)timerDidFire:(NSTimer *)timer { if (self.target) { // `performSelector:` would generate a potential leak warning (http://stackoverflow.com/a/7073761/503916) objc_msgSend(self.target, self.selector); } else { [timer invalidate]; } } @end

Then you can create a nice category on NSTimer to make it really easy to leverage this new class:

/** * Method that can be used in favor of `scheduledTimerWithTimeInterval:target:selector:userInfo:repeats:` in case the target retains the timer instance. Using the aforementioned method would create a retain cycle in this case. */ @interface NSTimer (RetainCyclePrevention) + (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)timeInterval weakTarget:(id)target selector:(SEL)selector userInfo:(id)userInfo repeats:(BOOL)yesOrNo; @end @implementation NSTimer (RetainCyclePrevention) + (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)timeInterval weakTarget:(id)target selector:(SEL)selector userInfo:(id)userInfo repeats:(BOOL)yesOrNo { return [self scheduledTimerWithTimeInterval:timeInterval target:[[TMWeakTimerTarget alloc] initWithTarget:target selector:selector] selector:@selector(timerDidFire:) userInfo:userInfo repeats:yesOrNo]; } @end

[saikyoapp]

iPhone標準の時計アプリみたいにTableViewに時計を表示したい。

常に、秒単位で全セルの中身を更新するので、できるのか？とまず思いました。

あと ・常に全セルを再表示ってのはエコじゃない ・スクロール時にtimerが止まる とか、そういう問題もあるんですね。

「Cellの表示と更新を分ける」、など助かる記述がいっぱい！ http://ios-practice.readthedocs.org/en/latest/docs/tableview/

NSTimer を使うアプリ（時計、ゲームなど）で Mobclix 広告を利用する場合の注意点 http://d.hatena.ne.jp/KishikawaKatsumi/20100117/1263738329

NSTimerがUITableViewをスクロールすると止まるのを解決する http://ssdkfk.wordpress.com/2013/07/17/nstimer%e3%81%8cuitableview%e3%82%92%e3%82%b9%e3%82%af%e3%83%ad%e3%83%bc%e3%83%ab%e3%81%99%e3%82%8b%e3%81%a8%e6%ad%a2%e3%81%be%e3%82%8b%e3%81%ae%e3%82%92%e8%a7%a3%e6%b1%ba%e3%81%99%e3%82%8b/

セルの再描画などについても http://hamken100.blogspot.jp/2013/01/ios-uitableviewcell.html

iOS (iPhone/iPad) アプリ開発でタイマーを使ってテーブルの項目を定期的に更新させる http://d.hatena.ne.jp/hypercrab/20120107/1325926722

現在時刻を表示する http://ebisu.surbiton.jp/sysblog/2011/06/timer.html

NSDateを使って残り時間を表示する http://obc-fight.blogspot.jp/2013/08/nsdate.html

[failnotes-blog]

NSTimer and NSRunLoop

When working with NSTimers that should update certain stuff in the UI, don't forget to add your timer to the corresponding NSRunLoop mode:

NSRunLoop *runloop = [NSRunLoop currentRunLoop]; [runloop addTimer:self.frameTimer forMode:NSRunLoopCommonModes]; [runloop addTimer:self.frameTimer forMode:UITrackingRunLoopMode];

Otherwise your timer won't fire while the user interacts with your controls.

[tweakingios-blog]

Prevent disabling of NSTimer Actions while scrolling inside a UIScrollView

Supposing you have a UIViewController, where you are currently having NSTimer actions going on repeatedly.

Now, if a User starts to scroll inside a UIScrollView then the NSTimer actions would be paused.

This is the default behaviour of iOS sdk. To prevent this from happening, use the following code : 

[[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];

This adds the Timer to the main NSRunLoop so as to never stop/pause from executing.

Happy Coding all of you!! :)