If your deployment target is iOS 5.0 or later, use this message:

    [self dismissViewControllerAnimated:YES completion:nil];

Or in Swift:

&lt;!-- language: Lang-swift --&gt;

    self.dismissViewControllerAnimated(true, completion: nil)

If your deployment target is older, use this (deprecated) message:

    [self dismissModalViewControllerAnimated:YES];



`[self dismissViewControllerAnimated:YES completion:nil];` is a new way in IOS5

The following should work fine...

    [self dismissModalViewControllerAnimated:YES];

I do exactly this with a login page in my [latest tutorial here][1], with no issues.


  [1]: http://maybelost.com/2011/12/tutorial-storyboard-app-with-core-data/

The following code works in swift 3:

   

     self.dismiss(animated: true, completion: nil)




I&#39;m trying to sort an array of objects. I&#39;d prefer not to write a custom sort method for each attribute.

Is there anyway I could extend the built-in `array.sort()` method to accept an extra parameter, describing the attribute to sort on? E.g.,

    array.sort(function(a, b, attr) { return a.attr - b.attr; }, &#39;name&#39;);


Any way to extend javascript&#39;s array.sort() method to accept another parameter?

What is the most efficient way to prepend `std::string`? Is it worth writing out an entire function to do so, or would it take only 1 - 2 lines? I&#39;m not seeing anything related to an `std::string::push_front`.

Prepend std::string

I&#39;m manually invoking a segue (set as modal) in order to display a login form in Xcode 4.2 using Storyboards with the following line of code:

    [self performSegueWithIdentifier:@&quot;LoginSegue&quot; sender:nil];

I&#39;m probably missing something really simple, however I can&#39;t find a way to programmatically close the login view and return to the previous view.

The view is part of a navigation view controller, so setting the segue type to &quot;push&quot; allows me to use the back button to send me back to my previous screen, but in &quot;modal&quot; mode, I&#39;m not entirely sure how to achieve this (after button press, for example)

Any help would be much appreciated.

Closing a view displayed via a modal segue

I'm manually invoking a segue (set as modal) in order to display a login form in Xcode 4.2 using Storyboards with the following line of code:
<pre><code class="hljs language-lua">[self performSegueWithIdentifier:@"LoginSegue" sender:nil];
</code></pre>
I'm probably missing something really simple, however I can't find a way to programmatically close the login view and return to the previous view.
The view is part of a navigation view controller, so setting the segue type to "push" allows me to use the back button to send me back to my previous screen, but in "modal" mode, I'm not entirely sure how to achieve this (after button press, for example)
Any help would be much appreciated.

How do `opaque` `alpha` and the opacity of the background work together for a UIView and what are the differences between them?


![UIView](http://i.minus.com/jb2IP8TXbYTxKr.png)

UIView: opaque vs. alpha vs. opacity

I am wondering what the `atomically:` parameter stands for in the `writeToFile:atomically:` method (`-[NSArray writeToFile:atomically:]` for example). It is common to pass `YES` for `atomically:`, but I don&#39;t know what it means.

writeToFile:atomically: what does atomically mean?

I&#39;m customizing a `UITableView`. I want to hide the line separating on the *last* cell ... can i do this?

I know I can do `tableView.separatorStyle = UITableViewCellStyle.None` but that would affect *all* the cells of the tableView. I want it to only affect my last cell.

Hide separator line on one UITableViewCell

For better re-usability I want to create a table view outside of my Storyboard.

Now when I create a `UITableView` based ViewController with Nib in Xcode I get the default TableView in the nib file. However, I am not able in Interface Builder to add prototype cells like I am in my Storyboard.

Is it currently not possible to add prototype cells in a nib or am I missing something.

Thanks very much for any help.

Prototype Cells in a nib instead of a storyboard

I have an NSArray that I want to filter out certain objects using an NSPredicate, I was hoping I could use NOT IN since I saw that I can easily do an IN.

So I have my array:

    self.categoriesList

Then I get the values I want to remove:

    NSArray *parentIDs = [self.cateoriesList valueForKeyPath:@&quot;@distinctUnionOfObjects.ParentCategoryID&quot;];

This gives me a list of ParentCategoryID&#39;s for categories I DO NOT want to display, so I figure I can use an NSPredicate to remove them:

    self.cateoriesList = [self.cateoriesList filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@&quot;CategoryID NOT IN %@&quot;,parentIDs]];

This fails:

    reason: &#39;Unable to parse the format string &quot;CategoryID NOT IN %@&quot;&#39;

If I wanted to use just IN that works perfectly of course.
 

NSArray with NSPredicate using NOT IN

I didn&#39;t received any notifications for `MPMoviePlayerController`. What am I doing wrong?

I use following logic.

I&#39;m begining to play youtube video in `UIWebView`. `UIWebView` calls a standard `MPMoviePlayerController`. I don&#39;t control `MPMoviePlayerController` because I didn&#39;t instantiate `MPMoviePlayerController`.  

I run youtube&#39;s clip with autoplay (1 second delay):

    [self performSelector:@selector(touchInView:) withObject:b afterDelay:1];

My code is:

    - (void)viewDidLoad
    {
        [super viewDidLoad];
        
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(loadStateDidChange:) name:MPMoviePlayerLoadStateDidChangeNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackDidFinish:) name:MPMoviePlayerDidExitFullscreenNotification object:nil];
        
        [self embedYouTube];
    }

    - (void)loadStateDidChange:(NSNotification*)notification
    {
        NSLog(@&quot;________loadStateDidChange&quot;);
    }

    - (void)playbackDidFinish:(NSNotification*)notification
    {
        NSLog(@&quot;________DidExitFullscreenNotification&quot;);
    }

    - (void)embedYouTube
    {
        CGRect frame = CGRectMake(25, 89, 161, 121);
        NSString *urlString = [NSString stringWithString:@&quot;http://www.youtube.com/watch?v=sh29Pm1Rrc0&quot;];
        
        NSString *embedHTML = @&quot;&lt;html&gt;&lt;head&gt;\
        &lt;body style=\&quot;margin:0\&quot;&gt;\
        &lt;embed id=\&quot;yt\&quot; src=\&quot;%@\&quot; type=\&quot;application/x-shockwave-flash\&quot; \
        width=\&quot;%0.0f\&quot; height=\&quot;%0.0f\&quot;&gt;&lt;/embed&gt;\
        &lt;/body&gt;&lt;/html&gt;&quot;;
        NSString *html = [NSString stringWithFormat:embedHTML, urlString, frame.size.width, frame.size.height];
        UIWebView *videoView = [[UIWebView alloc] initWithFrame:frame];
        videoView.delegate = self;
        
        for (id subview in videoView.subviews)
            if ([[subview class] isSubclassOfClass: [UIScrollView class]])
                ((UIScrollView *)subview).bounces = NO;
                
                [videoView loadHTMLString:html baseURL:nil];
        [self.view addSubview:videoView];
        [videoView release];
    }

    - (void)webViewDidFinishLoad:(UIWebView *)_webView 
    {
        UIButton *b = [self findButtonInView:_webView];
        [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(touchInView:) object:b];
        [self performSelector:@selector(touchInView:) withObject:b afterDelay:1];
    }

    - (UIButton *)findButtonInView:(UIView *)view 
    {
        UIButton *button = nil;
        
        if ([view isMemberOfClass:[UIButton class]]) {
            return (UIButton *)view;
        }
        
        if (view.subviews &amp;&amp; [view.subviews count] &gt; 0) 
        {
            for (UIView *subview in view.subviews) 
            {
                button = [self findButtonInView:subview];
                if (button) return button;
            }
        }
        return button;
    }

    - (void)touchInView:(UIButton*)b
    {
        [b sendActionsForControlEvents:UIControlEventTouchUpInside];
    }

**UPDATE:** I&#39;m creating application that plays youtube&#39;s video. You can run playlist and you will see first video. When first video has ended, second video begins play automatically and so on. 

I need to support ios 4.1 and above.


**UPDATE2:** @H2CO3 I&#39;m trying to use your url-scheme, but it don&#39;t works. Delegate method didn&#39;t called on exit event.  I added my html url to log.
It is:

    &lt;html&gt;&lt;head&gt;	&lt;body style=&quot;margin:0&quot;&gt;    
    &lt;script&gt;function endMovie() 
    {document.location.href=&quot;somefakeurlscheme://video-ended&quot;;} 
     &lt;/script&gt;    	&lt;embed id=&quot;yt&quot; src=&quot;http://www.youtube.com/watch?v=sh29Pm1Rrc0&quot;        
     onended=&quot;endMovie()&quot; type=&quot;application/x-shockwave-flash&quot; 	
     width=&quot;161&quot; height=&quot;121&quot;&gt;&lt;/embed&gt;	
     &lt;/body&gt;&lt;/html&gt;

    - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
    {
      if ([[[request URL] absoluteString] hasPrefix:@&quot;somefakeurlscheme://video-ended&quot;]) 
      {
        [self someMethodSupposedToDetectVideoEndedEvent];
        return NO; // prevent really loading the URL
       }
      return YES; // else load the URL as desired
    }

**UPDATE3**
@Till, I cann&#39;t caught UIMoviePlayerControllerDidExitFullscreenNotification, but I found MPAVControllerItemPlaybackDidEndNotification. MPAVControllerItemPlaybackDidEndNotification appears when playback video is ended. 

But I don&#39;t understand how do I catch onDone notifications? 

 




        

How to receive NSNotifications from UIWebView embedded YouTube video playback

I&#39;m currently working on an app that uses the &quot;ChalkboardSE-Regular&quot; font and my deployment target is 4.0+.  This font was not available in 4.1 but it is supported in 4.3.  What would be the best way to go about checking if the font exists and if it does not, use another supported font on the &lt;4.1 versions of iOS. [UIFont familyName] returns a list of these fonts &quot;Chalkboard SE&quot;

Thanks in advance!

T

How to check if a font is available in version of iOS?

I need to get the country location of a iOS device.

I&#39;ve been trying to use CoreLocation with MKReverseGeocoder. However this seems to return erraneous quite frequently. And I only need the country, no need for streets and such.

How can this be done in a more stable way?

Get device location (only country) in iOS

[![enter image description here][1]][1]

IF I wanted a picker, for states/provinces, i haven&#39;t seen an example, but I mocked up shown above, a picker for US/Can/Mex. wondering can you dynamically switch the NSMutableArray for the UIPickerView and then have it somehow reload each time you click on US/Can/Mex buttons???  How do I go about doing this.  What approach do I take.  Looking for someone to point a beginner for a clue in the right direction.  

 


  [1]: https://i.stack.imgur.com/5ATRG.jpg

How do I reload/refresh the UIPickerView (with new data array) based on button press?

A while ago I was experimenting, trying to see if i could get navigation items to animate and scroll between each other.

I don&#39;t know if this is related but suddenly without touching the simulator options I&#39;m getting this message `Simulator slow-motion animations are now on` and moving between views is very slow, like 3 seconds. This occurs with all animation effects.

Any idea what I need to do to stop this ?

Simulator slow-motion animations are now on?

I&#39;m developing an iOS 4 application using iOS SDK latest version and XCode 4.2.

I have a XIB with a `UIWebView` with **Alpha = 1.0**, **Background** set to **Clear Color** and **Opaque** is not set. On this XIB I setup an image as background with this code:

    - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
    {
        self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
        if (self) {
            UIColor *background = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@&quot;AboutBackground.png&quot;]];
            self.view.backgroundColor = background;
            [background release];
        }
        return self;
    }

The `UIWebView` is showing an static html:

    &lt;html&gt;&lt;head&gt;&lt;/head&gt;&lt;body style=\&quot;margin:0 auto;text-align:center;background-color: transparent; color:white\&quot;&gt;...&lt;/body&gt;&lt;/html&gt;

On iOS 5 simulator, its background is transparent, but on an iOS 4 device is grey.

Any clue?


UIWebView background is set to Clear Color, but it is not transparent

Without using a storyboard we could simply drag a `UIView` onto the canvas, lay it out and then set it in the `tableView:viewForHeaderInSection` or `tableView:viewForFooterInSection` delegate methods.

**How do we accomplish this with a StoryBoard where we cannot drag a UIView onto the canvas**



How to Implement Custom Table View Section Headers and Footers with Storyboard

Are there any guidelines on when to use storyboards in an iOS project and when to use XIBs? what are the pros and cons of each and what situations do they each suit?

Near as I can tell it&#39;s not that clean to use storyboard segues when you have view controllers being pushed by dynamic UI elements (Like map pins).

When to use Storyboard and when to use XIBs

Is it possible to segue from one storyboard to another, or to embed a storyboard in a view controller in another storyboard? I need to place a `UITabBarController` in a `UINavigationController`, and I&#39;d like to keep them nice and separate.

Segue to another storyboard?

im having trouble overriding the initialization method for my CustomViewController thats designed in my Storyboard.

now im doing (in my mainViewController):

    self.customViewController = [[UIStoryboard storyboardWithName:@&quot;MainStoryboard_iPhone&quot; bundle:nil] instantiateViewControllerWithIdentifier:@&quot;CustomVC&quot;];
    self.customViewController.myObject = someObject;

and i have in viewDidLoad (CustomViewController)

        [self.label setText:self.myObject.someString];

This works ok.

But, is it the correct way? Should i add a custom init method (or override) to my CustomViewController ? Like initWithObject: ? I dont know how to call my custom init method instead of `UIStoryboard instantiateViewControllerWithIdentifier:`, and im not getting calls to `init` nor `initWithNibName`.

Maybe i should use: `- (id)initWithCoder:(NSCoder *)decoder`. 

Please give me some advice!


Thank you!

Content Type	Original Author	Original Content on Stackoverflow
Question	Nick	View Question on Stackoverflow
Solution 1 - Objective C	rob mayoff	View Answer on Stackoverflow
Solution 2 - Objective C	denny	View Answer on Stackoverflow
Solution 3 - Objective C	Simon	View Answer on Stackoverflow
Solution 4 - Objective C	Bogdan Razvan	View Answer on Stackoverflow

Closing a view displayed via a modal segue

Objective C Problem Overview

Objective C Solutions

Solution 1 - Objective C

Solution 2 - Objective C

Solution 3 - Objective C

Solution 4 - Objective C

Prepend std::string

Any way to extend javascript's array.sort() method to accept another parameter?

Attributions