I'm very new to ios programming and I'm facing a problem regarding the update of labels during audio processing tasks.
I use a classic RecordingCallback -> ProcessAudio method. In ProcessAudio I would like to stop the recording if the level is too low. This was quite easy to do. But when it stops, I can't change the text label from "Recording" to "Stopped". It works great with the button (play/stop) but not when calling back. There is no error during compiling. Just nothing happens...
Here is the code :
-(void)processAudio:(AudioBufferList *)bufferList{
AudioBuffer sourceBuffer = bufferList->mBuffers[0];
// copy incoming audio data to temporary buffer
memcpy(tempBuffer.mData, bufferList->mBuffers[0].mData, bufferList->mBuffers[0].mDataByteSize);
int16_t* samples = (int16_t*)(tempBuffer.mData);
for ( int i = 0; i < tempBuffer.mDataByteSize / 2; ++i )
{
if (samples[i]< LevelTrigger)
{
Presence++;
if (Presence== 2 * SampleRate)
{
printf("Nothing");
//dispatch_async(dispatch_get_main_queue(), ^{
//[self buttonPressed:nil];
//});
//[self buttonPressed:nil];
[label performSelectorOnMainThread:#selector(setText:) withObject:#"TEST" waitUntilDone:YES];
Presence=0;
break;
}
}
As you can see, I have tried to use "dispatch_async" and "performSelectorOnMainThread" functions but it didn't help. The buttonPressed function is called correctly, but nothing happens.
Thanks for you help.
JC
This is what I did:
Cloned the repository provided by your link:
git clone https://github.com/jar-son/rioGraph.git
Can you read patch format? http://pastebin.com/Sc0eb3tR (link is valid for 30 days from now on) Summary of what I did:
Added a #class ViewController to Audio.h
Added a #property (nonatomic, assign) ViewController *viewController; to the Audio.h
Added [self.viewController performSelectorOnMainThread:#selector(setMyLabel) withObject:self waitUntilDone:NO]; to -(void)processAudio:(AudioBufferList *)bufferList in Audio.m
Added - (void)setMyLabel; to ViewController.h
Added
- (void)setMyLabel
{
self.label.text = #"blablabla!";
} to ViewController.m
...and it just worked.
PS: This explains how to apply a patch: https://ariejan.net/2009/10/26/how-to-create-and-apply-a-patch-with-git/
Related
This question appears to be asked and answered many times but with no specific or accurate answer. Hence I will reframe the question for iOS7 and hope for some help.
I need to use AudioServicesPlaySystemSound to play sounds as timing is critical and this is only way to play simultaneous sound effect accurately with variable timing (try every other option).
This works well but I would like to adjust the volume. The only way it appears to be able to do this is with the buttons although some say use MPVolumeView (only works for music), some say use MPMusicPlayerController (but this also only works for music and is now depreciated), and others just say it cannot be done - which is looking more likely.
However, with iOS7 there is a slide control in settings>sounds for the ringer alert volume. Is there any way I can subclass, replicate, or access this slide control to change this volume from within the app?
Apple recommends using MPVolumeView, so I came up with this:
Add volumeSlider property:
#property (nonatomic, strong) UISlider *volumeSlider;
Init MPVolumeView and add somewhere to your view (can be hidden, without frame, or empty because of showsRouteButton = NO and showsVolumeSlider = NO):
MPVolumeView *volumeView = [MPVolumeView new];
volumeView.showsRouteButton = NO;
volumeView.showsVolumeSlider = NO;
[self.view addSubview:volumeView];
Find and save reference to UISlider:
__weak __typeof(self)weakSelf = self;
[[volumeView subviews] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
if ([obj isKindOfClass:[UISlider class]]) {
__strong __typeof(weakSelf)strongSelf = weakSelf;
strongSelf.volumeSlider = obj;
*stop = YES;
}
}];
Add target action for UIControlEventValueChanged:
[self.volumeSlider addTarget:self action:#selector(handleVolumeChanged:) forControlEvents:UIControlEventValueChanged];
And then update your custom control when the volume has been changed (i.e. by the hardware volume controls):
- (void)handleVolumeChanged:(id)sender
{
NSLog(#"%s - %f", __PRETTY_FUNCTION__, self.volumeSlider.value);
self.myCustomVolumeSliderView.value = self.volumeSlider.value;
}
and also other way around:
- (IBAction)myCustomVolumeSliderViewValueChanged:(id)sender {
NSLog(#"set volume to: %f", self.myCustomVolumeSliderView.value);
self.volumeSlider.value = self.myCustomVolumeSliderView.value;
}
NOTE: Make sure that setting the self.volumeSlider.value doesn't loop back to setting self.myCustomVolumeSliderView.value.
Hope this helps someone (and that Apple doesn't remove MPVolumeSlider from MPVolumeView).
I think you want to control your volume through program
- (void)setVolume:(float)Level
{
OSStatus errorMsg = AudioQueueSetParameter(audioQueue, kAudioQueueParam_Volume, Level);
if (errorMsg) {
NSLog(#"AudioQueueSetParameter returned %d when setting the volume.", errorMsg);
}
}
use this code to set volume level passing from your code by which button you want to control.
I've been searching far and long, and to this moment, I did not come across a working solution for PhoneGap / Cordova applications that would show soft keyboard programmatically.
Scenario:
We have a PhoneGap application - a website created in jQuery Mobile - that at one point shows a dialog to the user. This dialog is also a web page and has one single INPUT text box where user should enter a code.
Problem:
When the code dialog is shown, the input box is focused using JavaScript. However, due to restrictions placed on iPhone's internal browser, the soft keyboard does not come up until the user actually really clicks inside the input text box.
What we tried:
creating a hidden text box and making it first responder
making the actual webview a first responder once the input receives focus via JavaScript
using sendActionsForControlEvents to try and delive Touch events to the webview (although if anyone has a working code for a PhoneGap application, I would appreciate if they could share it, since I'm no professional in iOS coding)
Any ideas?
EDIT: The restriction mentioned in this question is for built-in browsers only... if you're aiming Opera, you will be successful by using the following code:
var e = jQuery.Event("keydown", { keyCode: 37 });
$('#element').focus().trigger(e);
EDIT2: This is a final working PhoneGap code that can be used in a plugin:
keyboardhelper.h
//
// keyboardHelper.h
// soft keyboard displaying plugin for PhoneGap
//
// Copyright 2012 Martin Ambrus.
//
#import <Foundation/Foundation.h>
#ifdef CORDOVA_FRAMEWORK
#import <Cordova/CDVPlugin.h>
#else
#import "CDVPlugin.h"
#endif
#interface keyboardHelper : CDVPlugin {
NSString *callbackID;
}
#property (nonatomic, copy) NSString *callbackID;
- (void)showKeyboard:(NSMutableArray*)arguments withDict:(NSMutableDictionary*)options;
#end
keyboardhelper.m
//
// keyboardHelper.m
// soft keyboard displaying plugin for PhoneGap
//
// Copyright 2012 Martin Ambrus.
//
#import "keyboardHelper.h"
#import "AppDelegate.h"
#implementation keyboardHelper
#synthesize callbackID;
-(void)showKeyboard:(NSMutableArray*)arguments withDict:(NSMutableDictionary*)options {
self.callbackID = [arguments pop];
//Get text field coordinate from webview. - You should do this after the webview gets loaded
//myCustomDiv is a div in the html that contains the textField.
int textFieldContainerHeightOutput = [[((AppDelegate *)[[UIApplication sharedApplication] delegate]).viewController.webView stringByEvaluatingJavaScriptFromString:#"document.getElementById(\"myCustomDiv\").offsetHeight;"] intValue];
int textFieldContainerWidthOutput = [[((AppDelegate *)[[UIApplication sharedApplication] delegate]).viewController.webView stringByEvaluatingJavaScriptFromString:#"document.getElementById(\"myCustomDiv\").offsetWidth;"] intValue];
int textFieldContainerYOffset = [[((AppDelegate *)[[UIApplication sharedApplication] delegate]).viewController.webView stringByEvaluatingJavaScriptFromString:#"document.getElementById(\"myCustomDiv\").offsetTop;"] intValue];
int textFieldContainerXOffset = [[((AppDelegate *)[[UIApplication sharedApplication] delegate]).viewController.webView stringByEvaluatingJavaScriptFromString:#"document.getElementById(\"myCustomDiv\").offsetLeft;"] intValue];
UITextField *myTextField = [[UITextField alloc] initWithFrame: CGRectMake(textFieldContainerXOffset, textFieldContainerYOffset, textFieldContainerWidthOutput, textFieldContainerHeightOutput)];
[((AppDelegate *)[[UIApplication sharedApplication] delegate]).viewController.webView addSubview:myTextField];
myTextField.delegate = self;
CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsString: #"ok"];
[self writeJavascript:[pluginResult toSuccessCallbackString:self.callbackID]];
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
//here you create your request to the server
return NO;
}
-(BOOL)textFieldDidEndEditing:(UITextField *)textField
{
//here you create your request to the server
return NO;
}
#end
javascript
var keyboardHelper = {
showKeyboard: function(types, success, fail) {
return Cordova.exec(success, fail, "keyboardHelper", "showKeyboard", types);
}
};
You can solve the issue with a config.xml entry these days, add:
<preference name="keyboardDisplayRequiresUserAction" value="false" />
You can get the coordinates for the input field using javascript on the webView. Then, place your own textField right on top of it and in it's delegate method textFieldShouldReturn send a request to the server with the code the user typed in.
//Get text field coordinate from webview. - You should do this after the webview gets loaded
//myCustomDiv is a div in the html that contains the textField.
int textFieldContainerHeightOutput = [[webView stringByEvaluatingJavaScriptFromString:#"document.getElementById(\"myCustomDiv\").offsetHeight;"] intValue];
int textFieldContainerWidthOutput = [[webView stringByEvaluatingJavaScriptFromString:#"document.getElementById(\"myCustomDiv\").offsetWidth;"] intValue];
int textFieldContainerYOffset = [[webView stringByEvaluatingJavaScriptFromString:#"document.getElementById(\"myCustomDiv\").offsetTop;"] intValue];
int textFieldContainerXOffset = [[webView stringByEvaluatingJavaScriptFromString:#"document.getElementById(\"myCustomDiv\").offsetLeft;"] intValue];
myTextField.frame = CGRectMake(textFieldContainerXOffset, textFieldContainerYOffset, textFieldContainerWidthOutput, textFieldContainerHeightOutput);
[webView addSubview:myTextField];
myTextField.delegate = self;
Then you implement textFieldShouldReturn and create your request to the server there.
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
//here you create your request to the server
return NO;
}
This is done in existing project, however without using PhoneGap. I hope you can adapt it to suit your needs.
To remove the text field, you can hide it
myTextField.hidden = YES;
or
myTextField = nil;
or
[myTextField removeFromSuperView];
Prior to iOS 6, Apple only allowed the keyboard to be brought up following a user interaction. In iOS 6 they've introduced the following property for UIWebView which you merely need to set to NO.
"yourWebView".keyboardDisplayRequiresUserAction = NO;
Apple sets this by default to "Yes". Now you can call focus() in your JS and the keyboard will appear.
Have you tried using Native Controls and calling them from Javascript?
Here you have some code that shows the usage of Native Controls on a Phonegap Cordova application (Phonegap 1.5)
https://gist.github.com/1384250
Hope it helps to solve the problem :)
I admit this is private, but it might help you out:
#class UIKeyboard;
void showKeyboard()
{
static UIKeyboard *kb = nil;
if ([[UIKeyboard class] respondsToSelector:#selector(automaticKeyboard)])
kb = [UIKeyboard automaticKeyboard];
else
kb = [UIKeyboard activeKeyboard];
if (kb == nil) {
kb = [[[UIKeyboard alloc] initWithDefaultSize] autorelease];
[[[UIApplication sharedApplication] keyWindow] addSubview:kb];
}
if ([kb respondsToSelector:#selector(orderInWithAnimation:)]) {
[kb orderInWithAnimation:YES];
} else {
[kb activate];
[kb minimize];
[kb maximize];
}
}
And call it like this:
showKeyboard();
I actually just found a solution to this.
Like horak says and as described in this article, with or without soft keyboard, it's now possible to achieve this with iOS 6.0 by using: KeyboardDisplayRequiresUserAction = NO;
As of Cordova 2.2, the iOS property mentioned above can simply be added to the Cordova.plist file:
KeyboardDisplayRequiresUserAction, boolean, NO
This solves it all for everyone using Cordova 2.2. Now just call input.focus() as previously discussed, and the keyboard will automatically appear. For those of us who haven't yet updated our Cordova to the current latest version (2.2), it's fortunately still possible.
Programmatically show keyboard on iPhone using cordova v. < 2.2
Step 1:
Adding property to Cordova.plist
Go to your project > Resources > Cordova.plist. Add: KeyboardDisplayRequiresUserAction, boolean, NO
Step 2:
Adding below code snippet to CDVViewController.m
Search for "#interface CDVViewController" (or similar to locate above file). For Cordova 2.1, go to line 240 (everyone else go to a line after a "IsAtLeastiOSVersion" if statement, sorry can't be more precise than that.) Add this code snippet to your CDVViewController.m on the above mentioned line:
if (IsAtLeastiOSVersion(#"6.0")) {
BOOL keyboardDisplayRequiresUserAction = YES; // KeyboardDisplayRequiresUserAction - defaults to YES
if ([self.settings objectForKey:#"KeyboardDisplayRequiresUserAction"] != nil) {
if ([self.settings objectForKey:#"KeyboardDisplayRequiresUserAction"]) {
keyboardDisplayRequiresUserAction = [(NSNumber*)[self.settings objectForKey:#"KeyboardDisplayRequiresUserAction"] boolValue]; //JB-VAL121212
}
}
// property check for compiling under iOS < 6
if ([self.webView respondsToSelector:#selector(setKeyboardDisplayRequiresUserAction:)]) {
[self.webView setValue:[NSNumber numberWithBool:keyboardDisplayRequiresUserAction] forKey:#"keyboardDisplayRequiresUserAction"];
}
}
Disclaimer: This has been tested on Cordova 2.1 only, it is, however, very likely that it still works with 2.0 or any other earlier version that comes with the CDVViewController.m file)
You can use the FocusOut event on the input field and this will be fired when the Done key is pressed. I could use this on IOS 6 and above. I believe it will also work on previous versions.
In my iPhone app I am downloading some data from an FTP server. To show the action I am using UIActivityIndicator. If I put UIProgressView there instead of UIActivityIndicator, it will be more appropriate. How do I use UIProgressView while downloading some data? Can anybody give me a tutorial link or example code? Thanks in advance.
first you create IBOutlet in .h file
IBOutlet UIProgressView * threadProgressView;
Then in .m file in viewdidload first set progress to 0.0 and then call makeMyProgressMoving method
threadProgressView.progress = 0.0;
[self performSelectorOnMainThread:#selector(makeMyProgressBarMoving) withObject:nil waitUntilDone:NO];
then add below method
- (void)makeMyProgressBarMoving {
float actual = [threadProgressView progress];
if (actual < 1) {
threadProgressView.progress = actual + ((float)recievedData/(float)xpectedTotalSize);
[NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:#selector(makeMyProgressBarMoving) userInfo:nil repeats:NO];
}
else{
}
}
also give your review for answer. is it useful to you?
It is quite simple. You just need to set appropriate value of property progress of UIProgressView.
In delegate of NSURLConnection you should receive the amount of data you are waiting to download and update the progress during downloading. Progress is represented by a floating-point value between 0.0 and 1.0, inclusive, where 1.0 indicates the completion of the task.
You can display progress of progress bar with these line of code
-(void) connection:(NSURLConnection *) connection
didReceiveData:(NSData *) data {
if (file)
{
[file seekToEndOfFile];
progressView.progress = ((float)recievedData / (float) xpectedTotalSize);
}
[file writeData:data];
recievedData += data.length;
NSLog(#"Receiving Bytes: %d", recievedData);
}
One of the option is AFNetworking.
AFURLConnectionOperation also allows you to easily stream uploads and downloads, handle authentication challenges, monitor upload and download progress, and control the caching behavior or requests.
noted: self.progressionBalance.progress = 5.0/10.0;
you must set decimal.
So I have a subclass of a CCSprite object, and in its init method, I call:
[self scheduleUpdate]
I later release this object from its parent CCNode like so:
[self removeChild:sprite cleanup:YES];
In addition, I call [self unscheduleUpdate] in the sprite's dealloc method.
However, I'm getting a bad memory access, so it appears that the update method is still attempted after the object is released (I've narrowed it down to this, as it works perfectly if I comment out the [self scheduleUpdate] line.
Any ideas?
Found this post in an attempt to ask the same question. I tried unschedule update (within my init method as well) with no luck, but then realized that by moving the [self unscheduleUpdate]; to the actual update method (which is running continuously, unlike the init method) based on a condition it worked!
So, for those looking for copy paste, here's a progress bar example that I'm implementing from http://www.ccsprite.com/cocos2d/using-ccprogresstimer-cocos2d-example.html#HCB_comment_box
-(id) init
{
//initialize progress bar, make sure to add a file named green_health_bar.png to your
//resource folder
timer = [CCProgressTimer progressWithFile:#"green_health_bar.png"];
//set the progress bar type to horizontal from left to right
timer.type = kCCProgressTimerTypeHorizontalBarRL;
//initialize the progress bar to zero
timer.percentage = 0;
//add the CCProgressTimer to our layer and set its position
[self addChild:timer z:1 tag:20];
[timer setPosition:ccp(100, 280)];
[self scheduleUpdate];
}
and in your update method:
-(void)update:(ccTime)dt
{
//get progress bar
CCNode* node = [self getChildByTag:20];
timer.percentage += dt * 10;
if (timer.percentage >= 100)
{
[self gameOver]; //used to stop parallax and show gameover menu
[self unscheduleUpdate];
}
}
I usually don't allow forum reply emails, but feel free to ask questions via #russ152!
Hmm.. try not to use scheduleUpdate? I tried looking for self unscheduleUpdate but there is not such function in a CCNode.. You can try [self unscheduleAllselectors], which stops all selectors of the object , including the update selector, if you are not using the object anymore.. Or use custom selectors instead..
I am creating a music player application and it need that 2 actions to be called from a single button, one to skip to next track by touch up inside event and other to fast forward the curenttrack incase of a 'long press'. I don't know which event is pointing to this long press, i thought it to be touch down, but it worked only while holding the button. When i released the button, the track was skipped to next item. pls help
AVAudioPlayer *appSoundPlayer;// declared in .h file
In m file, the method:
-(void)seekForwards{
NSTimeInterval timex;
timex = appSoundPlayer.currentTime;
timex = timex+5; // forward 5 secs
appSoundPlayer.currentTime = timex;
timex = 0;
}
Personally I'd just track the button's state with an integer on your view controller or within a button subclass. If you track what the button is doing you can control what each of the actions do. In your .h file put in some stuff like this:
enum {
MyButtonScanning,
MyButtonStalling,
MyButtonIdle
};
#interface YourClass : UIViewController {
NSInteger buttonModeAt;
}
#property (nonatomic) NSInteger buttonModeAt;
-(IBAction)buttonPushedDown:(id)sender;
-(void)tryScanForward:(id)sender;
-(IBAction)buttonReleasedOutside:(id)sender;
-(IBAction)buttonReleasedInside:(id)sender;
#end
And then in your .m file throw in some of this stuff:
#implementation YourClass
///in your .m file
#synthesize buttonModeAt;
///link this to your button's touch down
-(IBAction)buttonPushedDown:(id)sender {
buttonModeAt = MyButtonStalling;
[self performSelector:#selector(tryScanForward:) withObject:nil afterDelay:1.0];
}
-(void)tryScanForward:(id)sender {
if (buttonModeAt == MyButtonStalling) {
///the button was not released so let's start scanning
buttonModeAt = MyButtonScanning;
////your actual scanning code or a call to it can go here
[self startScanForward];
}
}
////you will link this to the button's touch up outside
-(IBAction)buttonReleasedOutside:(id)sender {
if (buttonModeAt == MyButtonScanning) {
///they released the button and stopped scanning forward
[self stopScanForward];
} else if (buttonModeAt == MyButtonStalling) {
///they released the button before the delay period finished
///but it was outside, so we do nothing
}
self.buttonModeAt = MyButtonIdle;
}
////you will link this to the button's touch up inside
-(IBAction)buttonReleasedInside:(id)sender {
if (buttonModeAt == MyButtonScanning) {
///they released the button and stopped scanning forward
[self stopScanForward];
} else if (buttonModeAt == MyButtonStalling) {
///they released the button before the delay period finished so we skip forward
[self skipForward];
}
self.buttonModeAt = MyButtonIdle;
}
After that just link the button's actions to what I've noted in the comments before the IBactions. I haven't tested this but it should work.
you can subclass your button's class and play a bit around UIResponder's methods. For example, in touchesBegan method you can fire some timer and call method which will move throw your file and invalidate this timer in the toucesEnded method