objective c - How can I fade out an AVAudioPlayer on a background thread? -

-

i have audio file needs fade out while user scrolling uiscrollview. however, performselector:withobject:afterdelay: method blocked until user has stopped scrolling. have tried create code perform fadeout on thread:

- (void)fadeout {     [nsthread detachnewthreadselector:@selector(fadeoutinbackground:) totarget:self withobject:self.audioplayer]; }  - (void)fadeoutinbackground:(avaudioplayer *)aplayer {     nsautoreleasepool *mypool = [[nsautoreleasepool alloc] init];     [self performselector:@selector(fadevolumedown:) withobject:aplayer afterdelay:0.1];      [mypool release]; }  - (void)fadevolumedown:(avaudioplayer *)aplayer {     aplayer.volume = aplayer.volume - 0.1;     if (aplayer.volume < 0.1) {         [aplayer stop];              } else {         [self performselector:@selector(fadevolumedown:) withobject:aplayer afterdelay:0.1];       } }

it gets far performselector, no further because guess it's trying perform on thread has no access to. can't change performselector:onthread:withobject:waituntildone: because there no delay option.

any ideas? why have made hard fade out sound? moan

thanks!

i resolved similar issue scheduling selector in different run loop mode default one. way not interfering scrolling events. using nsrunloopcommonmodes worked me:

[self performselector:@selector(fadevolumedown:)             withobject:aplayer            afterdelay:0.1                inmodes:[nsarray arraywithobject: nsrunloopcommonmodes]];

Comments

Post a Comment

Popular posts from this blog

android - Spacing between the stars of a rating bar? -

-
ho can set spacing beween stars? thats ratingbar: ratingbar = (ratingbar) inflater.inflate(r.layout.ratingbar, null); ratingbar.setlayoutparams(new layoutparams(layoutparams.wrap_content, layoutparams.wrap_content)); the layout: <?xml version="1.0" encoding="utf-8"?> <ratingbar xmlns:android="http://schemas.android.com/apk/res/android" style="@style/mystyle" android:layout_alignparentright="true" android:layout_height="19dp" android:layout_width="wrap_content" android:numstars="5"> </ratingbar> the style: <style name="mystyle" parent="@android:style/widget.ratingbar"> <item name="android:progressdrawable">@drawable/android_r2_ratingstar_yellow</item> <item name="android:indeterminatedrawable">@drawable/android_r2_ratingstar_grey</item> </style> thanks, cheers you have
Read more

aspxgridview - Devexpress grid - header filter does not work if column is initially hidden -

-
i'm using devexpress grid , i'm trying 'country' column display header filter properly: <dx:gridviewdatacolumn caption="country" fieldname="countryname" showincustomizationform="true" visible="false"> <settings allowheaderfilter="true"/> </dx:gridviewdatacolumn> if 'country' column set visible='true', header filter displayed should(it shows value option list). however, want 'country' column hidden, available in customization window(like in code above). in case, when column dragged outside customization window , grid , header filter clicked, javascript error encountered: element null element.addeventlistener(eventname, func, true); is known bug? there workarounds? set aspxgridview.settings.showheaderfilterbutton property true resolve problem. the following markup works fine me (i using dxperience 10.1.7): <asp:accessdatasource id="accessda
Read more

c# - How to execute a particular part of code asynchronously in a class -

-
i creating speech recognition engine that's going respond user commands.i have created button enable , disable speech recognition per user convenience.i have used dispose() of speech engine disable speech recoginition.here code private void button1_click(object sender, routedeventargs e) { engineon = !engineon; if (engineon) { speechengine = speech.createspeechengine(); //speech class creates , returns new speech engine. speechengine.audiolevelupdated += new eventhandler<audiolevelupdatedeventargs>(speechengine_audiolevelupdated); // use system's default microphone speechengine.setinputtodefaultaudiodevice(); speechengine.loadgrammar(new dictationgrammar()); // start listening speechengine.recognizeasync(recognizemode.multiple); } else { speechclass.myengine.dispose(); } } but disposal of speech obj
Read more