I need to update my ruby version from 2.0.0 to the latest version, I can not use some gems because my version is not updated.
I had used Homebrew to install Ruby some time ago, How can i update my Ruby version?

 

How to update Ruby Version 2.0.0 to the latest version in Mac OSX Yosemite?

When I do a `\dt` in psql I only get a listing of tables in the current schema (`public` by default).

How can I get a list of all tables in all schemas or a particular schema?

List tables in a PostgreSQL schema

There are a lot of questions about this problem on SO:

- https://stackoverflow.com/questions/4401232/avfoundation-how-to-turn-off-the-shutter-sound-when-capturestillimageasynchrono
- https://stackoverflow.com/questions/9557081/how-can-i-mute-the-capture-sound-in-avfoundation
- https://stackoverflow.com/questions/17040309/i-wish-i-could-mute-shutter-sound-of-camera-using-ios-sdk

But really no one answer works for me.

How do I capture an image programmatically without the camera shutter sound activating?

Capture image via captureStillImageAsynchronouslyFromConnection with no shutter sound

There are a lot of questions about this problem on SO:
<ul>
<li><a href="https://stackoverflow.com/questions/4401232/avfoundation-how-to-turn-off-the-shutter-sound-when-capturestillimageasynchrono" target="_blank" rel="noopener noreferrer">https://stackoverflow.com/questions/4401232/avfoundation-how-to-turn-off-the-shutter-sound-when-capturestillimageasynchrono</a></li>
<li><a href="https://stackoverflow.com/questions/9557081/how-can-i-mute-the-capture-sound-in-avfoundation" target="_blank" rel="noopener noreferrer">https://stackoverflow.com/questions/9557081/how-can-i-mute-the-capture-sound-in-avfoundation</a></li>
<li><a href="https://stackoverflow.com/questions/17040309/i-wish-i-could-mute-shutter-sound-of-camera-using-ios-sdk" target="_blank" rel="noopener noreferrer">https://stackoverflow.com/questions/17040309/i-wish-i-could-mute-shutter-sound-of-camera-using-ios-sdk</a></li>
</ul>
But really no one answer works for me.
How do I capture an image programmatically without the camera shutter sound activating?

![enter image description here][1]


1) How can i achieve as shown in image with `UICollectionView`?

2) I&#39;ve tried `-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath` method &amp; passed different sizes but it leaves out spaces between cells. Can i empty those spaces? I want different height &amp; width for every cell

**Current output:** 
![enter image description here][2].

  [1]: http://i.stack.imgur.com/QnRtn.png
  [2]: http://i.stack.imgur.com/FCeEq.jpg

Dynamic size UICollectionView cell

I need to open Settings programmatically from within my app. I searched across SO but everywhere people say that it&#39;s impossible. But today I saw that it&#39;s implemented in Facebook app. There&#39;s a button on an `UIAlertView` and when you click it you open the Settings. So indeed this is possible to open Settings, I have witnessed this myself. But how to do that? Does anyone know how Facebook does that?

How to open Settings programmatically like in Facebook app?

We have iPad and iPhone devices, but short of wires. Is there any way that we can install/debug the builds over Wi-Fi in iOS? 

I know the way in Android, but not of iOS.

iOS – Run/Debug/Install builds over Wi-Fi

How can I hide the Back Button Text from an UINavigation Controller?
I will only have the &quot;&lt;&quot; and not &quot;&lt; Back&quot;

UINavigationBar Hide back Button Text

I have created a `UIToolBar` programmatically and added a `UITextField` on it. Now, I need that toolbar to be above the keyboard when I click in another text field.                  

    UIToolbar *toolBar=[[UIToolbar alloc]initWithFrame:CGRectMake(0,400, 320, 60)];
    [self.view addSubview:toolBar];
    
    UITextField *txtView=[[UITextField alloc]initWithFrame:CGRectMake(0, 400, 260, 30)];
    txtView.backgroundColor =[UIColor  grayColor];
    txtView.placeholder=@&quot;Address&quot;;
    UIBarButtonItem *txtfieldItem=[[UIBarButtonItem alloc]initWithCustomView:txtView];
    toolBar.items =[NSArray arrayWithObject:txtfieldItem];


How can I add a toolbar above the keyboard?

I am using background task to run the timer in the background to update the user&#39;s location. It&#39;s declared as:

    UIBackgroundTaskIdentifier bgTask;

in the header file, and initialized as:

    bgTask = UIBackgroundTaskInvalid;

But still, I am getting this message in the gdb:

&gt; Can&#39;t endBackgroundTask: no background task exists with identifier 23dc, or it may have already been ended. Break in UIApplicationEndBackgroundTaskError() to debug.

Why? And how can I solve this?

Can&#39;t endBackgroundTask: no background task exists with identifier, or it may have already been ended

In Swift, how does one call Objective-C code?

Apple mentioned that they could co-exist in one application, but does this mean that one could technically re-use old classes made in Objective-C whilst building new classes in Swift?

How do I call Objective-C code from Swift?

I&#39;m trying to use an @IBAction to tie up a button click event to a Swift method. In Objective-C the parameter type of the IBAction is id. What is the equivalent of id in Swift?

What is the equivalent of an Objective-C id in Swift?

How do you play a video with AV Kit Player View Controller in Swift?


    override func viewDidLoad() {
            super.viewDidLoad()
            let videoURLWithPath = &quot;http://****/5.m3u8&quot;
            let videoURL = NSURL(string: videoURLWithPath)
            playerViewController = AVPlayerViewController()

            dispatch_async(dispatch_get_main_queue()) {
                self.playerViewController?.player = AVPlayer.playerWithURL(videoURL) as AVPlayer
            }
        }

How to play video with AVPlayerViewController (AVKit) in Swift

As you see I&#39;m streaming an audio broadcast. But when I press the home button and exit the app streaming stops or I cannot hear. How can I continue streaming in background and listen it from lock screen?

ViewController.Swift


    import UIKit
    import AVFoundation
    import MediaPlayer
    import GoogleMobileAds
    
    
        class ViewController: UIViewController, GADInterstitialDelegate {
        
            @IBOutlet weak var exitMapButton: UIButton!
            @IBOutlet weak var radarMap: UIWebView!
            var interstitial: GADInterstitial!
            func createAndLoadInterstitial() -&gt; GADInterstitial {
                var interstitial = GADInterstitial(adUnitID: &quot;adUnitID-XXXX&quot;)
                interstitial.delegate = self
                interstitial.loadRequest(GADRequest())
                return interstitial
            }
            
            func getAd(){
                if (self.interstitial.isReady)
                {
                    self.interstitial.presentFromRootViewController(self)
                    self.interstitial = self.createAndLoadInterstitial()
                }
            }
            @IBOutlet weak var ataturkButton: UIButton!
            @IBOutlet weak var sabihaButton: UIButton!
            @IBOutlet weak var esenbogaButton: UIButton!
            @IBOutlet weak var weatherButton: UIButton!
            @IBOutlet weak var statusLabel: UILabel!
            @IBOutlet weak var playButton: UIButton!
            @IBOutlet weak var webViewButton: UIButton!
            var googleBannerView: GADBannerView!
    override func viewDidLoad() {
                super.viewDidLoad()
            }
    class PlayerAv {
                var audioLink: String?
                var player: AVPlayer
                init(link: String) {
                    self.audioLink = link
                    self.player = AVPlayer(URL: NSURL(string: link))
                }
            }
            var myPlayer = PlayerAv(link: &quot;http://somewebsite.com/abc.pls&quot;)
            var setTowerState = &quot;&quot;
            
            @IBAction func sliderValueChanged(sender: UISlider) {
                var currentValue = Float(sender.value)
                println(currentValue)
                myPlayer.player.volume = currentValue
            }
            @IBAction func getWeatherWindow(sender: AnyObject) {
                UIApplication.sharedApplication().openURL(NSURL(string: &quot;http://somewebpage.com&quot;)!)
                println(&quot;Directed to weather page&quot;)
            }
            @IBAction func changeToAtaturk() {
                myPlayer.player.pause()
                myPlayer = PlayerAv(link: &quot;http://somewebsite.com/abc.pls&quot;)
                myPlayer.audioLink == &quot;&quot;
                println(&quot;\(myPlayer.audioLink!)--a&quot;)
                playButton.setTitle(&quot;Pause&quot;, forState: UIControlState.Normal)
                myPlayer.player.play()
                setTowerState = &quot;ataturk&quot;
                statusLabel.text = &quot;Status: Playing, LTBA&quot;
            }
            @IBAction func changeToEsenboga() {
                myPlayer.player.pause()
                myPlayer = PlayerAv(link: &quot;http://somewebsite.com/def.pls&quot;)
                println(&quot;\(myPlayer.audioLink!)--a&quot;)
                playButton.setTitle(&quot;Pause&quot;, forState: UIControlState.Normal)
                myPlayer.player.play()
                setTowerState = &quot;esenboga&quot;
                statusLabel.text = &quot;Status: Playing, LTAC&quot;
            }
            @IBAction func changeToSabiha() {
                myPlayer.player.pause()
                myPlayer = PlayerAv(link: &quot;http://somewebsite.com/efg.pls&quot;)
                println(&quot;\(myPlayer.audioLink!)--a&quot;)
                playButton.setTitle(&quot;Pause&quot;, forState: UIControlState.Normal)
                myPlayer.player.play()
                setTowerState = &quot;sabiha&quot;
                statusLabel.text = &quot;Status: Playing, LTFJ&quot;
            }
            override func didReceiveMemoryWarning() {
                super.didReceiveMemoryWarning()
                // Dispose of any resources that can be recreated.
            }
            @IBAction func playButtonPressed(sender: AnyObject) {
                toggle()
            }
            func toggle() {
                if playButton.titleLabel?.text == &quot;Play&quot; {
                    playRadio()
                    println(&quot;Playing&quot;)
                    statusLabel.text = &quot;Status: Playing&quot;
                } else {
                    pauseRadio()
                    println(&quot;Paused&quot;)
                    statusLabel.text = &quot;Status: Paused&quot;
                }
            }
            func playRadio() {
                myPlayer.player.play()
                playButton.setTitle(&quot;Pause&quot;, forState: UIControlState.Normal)   
            }
            func pauseRadio() {
                myPlayer.player.pause()
                playButton.setTitle(&quot;Play&quot;, forState: UIControlState.Normal)
            }
        }

How to play audio in background with Swift?

I&#39;m working on an application where there is a collection view, and cells of the collection view can contain video. Right now I&#39;m displaying the video using `AVPlayer` and `AVPlayerLayer`. Unfortunately, the scrolling performance is terrible. It seems like `AVPlayer`, `AVPlayerItem`, and `AVPlayerLayer` do a lot of their work on the main thread. They are constantly taking out locks, waiting on semaphores, etc. which is blocking the main thread and causing severe frame drops.

Is there any way to tell `AVPlayer` to stop doing so many things on the main thread? So far nothing I&#39;ve tried has solved the problem.

I also tried building a simple video player using `AVSampleBufferDisplayLayer`. Using that I can make sure that everything happens off the main thread, and I can achieve ~60fps while scrolling and playing video. Unfortunately that method is much lower level, and it doesn&#39;t provide things like audio playback and time scrubbing out of the box. Is there any way to get similar performance with `AVPlayer`? I&#39;d much rather use that.

**Edit:**
After looking into this more, it doesn&#39;t look like it&#39;s possible to achieve good scrolling performance when using `AVPlayer`. Creating an `AVPlayer` and associating in with an `AVPlayerItem` instance kicks off a bunch of work which trampolines onto the main thread where it then waits on semaphores and tries to acquire a bunch of locks. The amount of time this stalls the main thread increases quite dramatically as the number of videos in the scrollview increases.

`AVPlayer` dealloc also seems to be a huge problem. Dealloc&#39;ing an `AVPlayer` also tries to synchronize a bunch of stuff. Again, this gets extremely bad as you create more players.

This is pretty depressing, and it makes `AVPlayer` almost unusable for what I&#39;m trying to do. Blocking the main thread like this is such an amateur thing to do so it&#39;s hard to believe Apple engineers would&#39;ve made this kind of mistake. Anyways, hopefully they can fix this soon.

Maintaining good scroll performance when using AVPlayer

Is it possible to use the existing Apple system sounds in my own app? I would like to write a sample app in Swift that does the following steps:

1. Read/Get a list of all available systemSounds on the device (I think they are located in `/System/Library/Audio/UISounds/`)
2. show the list on the screen
3. if I touch a list item, play these sound

So its basically the same, like when you choose a new ringtone on your iPhone.

I think some apps are using this sounds, or have they copied/bought it?

Thanks and regards
Jens

Using existing system sounds in iOS App [swift|

I would like to play a sound using Swift.

My code worked in Swift 1.0 but now it doesn&#39;t work anymore in Swift 2 or newer.
  
    override func viewDidLoad() {
      super.viewDidLoad()

      let url:NSURL = NSBundle.mainBundle().URLForResource(&quot;soundName&quot;, withExtension: &quot;mp3&quot;)!

      do { 
        player = try AVAudioPlayer(contentsOfURL: url, fileTypeHint: nil) 
      } catch _{
        return
      }

      bgMusic.numberOfLoops = 1
      bgMusic.prepareToPlay()

      if (Data.backgroundMenuPlayed == 0){
        player.play()
        Data.backgroundMenuPlayed = 1
      }
    }

Capture image via captureStillImageAsynchronouslyFromConnection with no shutter sound

Ios Problem Overview

Ios Solutions

List tables in a PostgreSQL schema

How to update Ruby Version 2.0.0 to the latest version in Mac OSX Yosemite?

Attributions