ios - How to set screen brightness with fade animations? -


is possible animate screen brightness change on ios 5.1+? using [uiscreen mainscreen] setbrightness:(float)] think abrupt change ugly.

i don't know if "animatable" in other way, yourself. instance following example code hooked "full bright" , "half bright" buttons in ui. uses performselector...afterdelay change brightness 1% every 10ms till target brightness reached. pick appropriate change rate based on experimenting. refresh rate is, think, 60 hz there no point in doing change @ interval smaller 1/60th of second (my example rate chosen have nice math). although might want on non-ui thread, doesn't block ui.

- (ibaction)fullbright:(id)sender {     cgfloat brightness = [uiscreen mainscreen].brightness;     if (brightness < 1) {         [uiscreen mainscreen].brightness += 0.01;         [self performselector:@selector(fullbright:) withobject:nil afterdelay:.01];     } }  - (ibaction)halfbright:(id)sender {     cgfloat brightness = [uiscreen mainscreen].brightness;     if (brightness > 0.5) {         [uiscreen mainscreen].brightness -= 0.01;         [self performselector:@selector(halfbright:) withobject:nil afterdelay:.01];     } }

Comments

Post a Comment

Popular posts from this blog

monitor web browser programmatically in Android? -

i've got tricky question here. need users make payment bank (namely barclaycard) in uk. so, have https url , add parameters (such amount pay, order reference, etc) url, start http connection intent.actionview, redirect user browser can enter credit card details on bank's webpage , make payment our account successfully. far ? the code use below (i changed values privacy reasons) problem is, need app when user has completed/failed/cancelled payment. barclaycardautomatically redirects particular url when payment has succeeded, 1 if failed. there no way of knowing when barclaycard payment has succeeded go android app somehow ? button cardbutton = (button) findviewbyid(r.id.card_button); cardbutton.setonclicklistener(new view.onclicklistener() { @override public void onclick(view arg0) { string prehashstring = new string(); string prohashstring = new string(); string shapassphrase = new string(); shapassphrase = "gsvth£h70zkh...
Read more

Shrink a YouTube video to responsive width -

i have youtube video embedded on our website , when shrink screen tablet or phone sizes stops shrinking @ around 560px in width. standard youtube videos or there can add code make go smaller? you can make youtube videos responsive css. wrap iframe in div class of "videowrapper" , apply following styles: .videowrapper { float: none; clear: both; width: 100%; position: relative; padding-bottom: 56.25%; padding-top: 25px; height: 0; } .videowrapper iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; } the .videowrapper div should inside responsive element. padding on .videowrapper necessary keep video collapsing. may have tweak numbers depending upon layout.
Read more

wpf - PdfWriter.GetInstance throws System.NullReferenceException -

i'm trying create pdf document using itextsharp 5.3.4 using following document document = new document(); filestream stm = new filestream(filename, filemode.create); pdfwriter writer = pdfwriter.getinstance(document, stm); i'm getting system.nullreferenceexception following stack trace: system.nullreferenceexception occurred hresult=-2147467261 message=la référence d'objet n'est pas définie à une instance d'un objet. source=itextsharp stacktrace: à itextsharp.text.version.getinstance() innerexception: i've verified neither document nor stm null, , if select "continue" in vs12 document created - exception thrown. updated itextsharp 5.4.0 , it's still occurring. can't find information on anywhere - got ideas? make sure not catching exceptions. nullreferenceexception can 1 caught , handled inside itextsharp, don't care it. fact can continue supports theory. change following setting verify: debug -> exceptions ...
Read more