The way to do this is to have 2 invisible &quot;spacer&quot; views between you visible views.

You can&#39;t make spaces have equal height. But you use the &quot;spacer&quot; views and place them between your views (with 0 gap to the surrounding views).

Then you give these views equal heights and they will push your views around to centre the `My View` with equal gap to the `Bottom View` and `Top View`.

i.e. like this...

    V:|[Top View][spacer1][My View][spacer2(==spacer1)][Bottom View]|

**EDIT - Another way**

I just thought of another way of doing this. You could have an invisible container `UIView` that is between `Top View` and `Bottom View` with no gap.

Then you place `My View` inside this invisible view and centre it vertically.

One more solution is to add an invisible view between *top view* and *botom view* and place *my view* in center of this view: 

[![Centered UIView][1]][1]

  [1]: https://i.stack.imgur.com/ZEyAY.png

(5 years later) I&#39;ve found the most canonical solution:

**`UILayoutGuide` is specially introduced to solve this kind of tasks (since iOS 9).**

*Use layout guides to replace the dummy views you may have created to represent inter-view spaces or encapsulation in your user interface* - [Ref docs][1]

It works pretty fine in code, but unfortunately Interface Builder doesn&#39;t support custom layout guides.


  [1]: https://developer.apple.com/documentation/uikit/uilayoutguide

This video gives an amazing overview of auto layout and constraints in interface builder: https://www.youtube.com/watch?v=1j-Frd5snYc

I tried making a navigation between fragments. I&#39;ve got the `NewFragment.java` with the new fragment working. My problem is: 

How do I make this `onClickListener` run `NewFragment.java` correctly?


    button.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {

            Intent i = new Intent(getActivity(), NewFragment.class);
            startActivity(i);

        }
    });

FYI: This is from inside a fragment (I don&#39;t know if that matters).

How do I open a new fragment from another fragment?

I am using SQL Server 2008 import and export wizard. I need to import a database. I opened the SQL server import/export wizard and I went through the following actions:-

1. for the destination I chose &quot;SQL server native client 10&quot;.

2. then I selected copy data from one or more tables or view.

3. SSIS run immediately

but i got the following errors, 

&gt; Operation stopped...
&gt; 
&gt; - Initializing Data Flow Task (Success)
&gt; 
&gt; 
&gt; - Initializing Connections (Success)
&gt; - Setting SQL Command (Success)
&gt; 
&gt; 
&gt; - Setting Source Connection (Success)
&gt; 
&gt; 
&gt; - Setting Destination Connection (Success)
&gt; 
&gt; 
&gt; - Validating (Error)
&gt; 
&gt; Messages Error 0xc0202049: Data Flow Task 1: Failure inserting into
&gt; the read-only column &quot;ActionID&quot;.  (SQL Server Import and Export
&gt; Wizard)  
&gt; 
&gt; Error 0xc0202045: Data Flow Task 1: Column metadata validation failed.
&gt; (SQL Server Import and Export Wizard)  
&gt; 
&gt; Error 0xc004706b: Data Flow Task 1: &quot;component &quot;Destination -
&gt; AuditActions&quot; (22)&quot; failed validation and returned validation status
&gt; &quot;VS_ISBROKEN&quot;.  (SQL Server Import and Export Wizard)

It seems that I can not import identity columns and timestamps columns, so how I can force these values to be imported?

Error 0xc0202049: Data Flow Task 1: Failure inserting into the read-only column

How to set up autolayout in Interface Builder to arrange views vertically as shown on image:

![scheme][1]

`Top view` pinned to top screen edge, `Bottom view` pinned to bottom screen edge. `My view` should be centered between top and bottom views (so distance to `Top view` equals to distance to `Bottom view`)

  [1]: http://i.stack.imgur.com/Rntb2.jpg

iOS autolayout to center my view between two views

How to set up autolayout in Interface Builder to arrange views vertically as shown on image:
<img src="http://i.stack.imgur.com/Rntb2.jpg" alt="scheme">
<code>Top view</code> pinned to top screen edge, <code>Bottom view</code> pinned to bottom screen edge. <code>My view</code> should be centered between top and bottom views (so distance to <code>Top view</code> equals to distance to <code>Bottom view</code>)

Regarding to this [tutorial by AppCoda about how to implement a app with UIPageViewController](http://www.appcoda.com/uipageviewcontroller-storyboard-tutorial/) I&#39;d like to use a custom page control element on top of the pages instead of at the bottom. 

When I just put a page control element on top of the single views which will be displayed, the logical result is that the control elements scrolls with the page view away from the screen. 

How is it possible to put the control element on top of the views so the page views are full screen (like with an image) so the user can see the views underneath the fixed control element?

I attached an example screenshot - credits to [AppCoda and Path](http://www.appcoda.com/uipageviewcontroller-tutorial-intro/):

![enter image description here][1]


  [1]: http://i.stack.imgur.com/pR5KH.jpg

How to put the UIPageControl element on top of the sliding pages within a UIPageViewController?

I am a little confused about the Firebase pricing model, special concern is the connections or more precisely concurrent connections. 

Let&#39;s have an example of a mobile app for iOS called FanZONE:

*User will create groups during football matches. They will comment on the actual game and the comments are immediately displayed on each members screen.* 

Does this scenario means that each user who is participating on commenting/viewing counts for one connection?  
So if a group contains 100 users who actively follow the screen and from time to time comment is there 100 connections each 90 minutes long?  
What about users who have the app in the background and the app checks each 5 minutes the score. Is this connection as well 90 minutes long or only a fraction of time every 5 minutes?

Clarify the Firebase connections

How to dynamically change placeholder color of the `UITextField`?
This is always the same system color.

No option in xib editor.

Change of UITextField placeholder color

I&#39;m getting some strange behaviour with `presentViewController:animated:completion`. What I&#39;m making is essentially a guessing game. 

I have a `UIViewController` (frequencyViewController) containing a `UITableView` (frequencyTableView). When the user taps on the row in questionTableView containing the correct answer, a view (correctViewController) should be instantiate and its view should slide up from the bottom of the screen, as a modal view. This tells the user they have a correct answer and resets the frequencyViewController behind it ready for the next question. correctViewController is dismissed on a button press to reveal the next question.

This all works correctly every time, and the correctViewController&#39;s view appear instantly as long as `presentViewController:animated:completion` has `animated:NO`.

If I set `animated:YES`, correctViewController is initialized and makes calls to `viewDidLoad`. However `viewWillAppear`, `viewDidAppear`, and the completion block from `presentViewController:animated:completion` are not called. The app just sits there still showing frequencyViewController until I make a second tap. Now, viewWillAppear, viewDidAppear and the completion block are called.

I investigated a bit more, and it&#39;s not just another tap that will cause it to continue. It seems if I tilt or shake my iPhone this can also cause it to trigger the viewWillLoad etc. It&#39;s like it&#39;s waiting to any other bit of user input before it will progress. This happens on a real iPhone and in the simulator, which I proved by sending the shake command to the simulator.

I&#39;m really at a loss as to what to do about this... I&#39;d really appreciate any help anyone can provide.

Thanks


Here&#39;s my code. It&#39;s pretty simple...

This is code in questionViewController that acts as the delegate to the questionTableView

    - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
    {
        
        if (indexPath.row != [self.frequencyModel currentFrequencyIndex])
        {
            // If guess was wrong, then mark the selection as incorrect
            NSLog(@&quot;Incorrect Guess: %@&quot;, [self.frequencyModel frequencyLabelAtIndex:(int)indexPath.row]);
            UITableViewCell *cell = [self.frequencyTableView cellForRowAtIndexPath:indexPath];
            [cell setBackgroundColor:[UIColor colorWithRed:240/255.0f green:110/255.0f blue:103/255.0f alpha:1.0f]];            
        }
        else
        {
            // If guess was correct, show correct view
            NSLog(@&quot;Correct Guess: %@&quot;, [self.frequencyModel frequencyLabelAtIndex:(int)indexPath.row]);
            self.correctViewController = [[HFBCorrectViewController alloc] init];
            self.correctViewController.delegate = self;
            [self presentViewController:self.correctViewController animated:YES completion:^(void){
                NSLog(@&quot;Completed Presenting correctViewController&quot;);
                [self setUpViewForNextQuestion];
            }];
        }
    }


This is the whole of the correctViewController

    @implementation HFBCorrectViewController
    
    - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
    {
        self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
        if (self)
        {
            // Custom initialization
            NSLog(@&quot;[HFBCorrectViewController initWithNibName:bundle:]&quot;);
        }
        return self;
    }
    
    - (void)viewDidLoad
    {
        [super viewDidLoad];
        // Do any additional setup after loading the view from its nib.
        NSLog(@&quot;[HFBCorrectViewController viewDidLoad]&quot;);
    }
    
    - (void)viewDidAppear:(BOOL)animated
    {
        [super viewDidAppear:animated];
        NSLog(@&quot;[HFBCorrectViewController viewDidAppear]&quot;);
    }
    
    - (void)didReceiveMemoryWarning
    {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }
    
    - (IBAction)close:(id)sender
    {
        NSLog(@&quot;[HFBCorrectViewController close:sender:]&quot;);
        [self.delegate didDismissCorrectViewController];
    }
    
    
    @end



**Edit:**

I found this question earlier: https://stackoverflow.com/questions/20320591/uitableview-and-presentviewcontroller-takes-2-clicks-to-display

And if I change my `didSelectRow` code to this, it works very time with animation... But it&#39;s messy and doesn&#39;t make sense as to why it doesn&#39;t work in the first place. So I don&#39;t count that as an answer...

    - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
    {
        
        if (indexPath.row != [self.frequencyModel currentFrequencyIndex])
        {
            // If guess was wrong, then mark the selection as incorrect
            NSLog(@&quot;Incorrect Guess: %@&quot;, [self.frequencyModel frequencyLabelAtIndex:(int)indexPath.row]);
            UITableViewCell *cell = [self.frequencyTableView cellForRowAtIndexPath:indexPath];
            [cell setBackgroundColor:[UIColor colorWithRed:240/255.0f green:110/255.0f blue:103/255.0f alpha:1.0f]];
            // [cell setAccessoryType:(UITableViewCellAccessoryType)]
            
        }
        else
        {
            // If guess was correct, show correct view
            NSLog(@&quot;Correct Guess: %@&quot;, [self.frequencyModel frequencyLabelAtIndex:(int)indexPath.row]);
            
            ////////////////////////////
            // BELOW HERE ARE THE CHANGES
            [self performSelector:@selector(showCorrectViewController:) withObject:nil afterDelay:0];
        }
    }
    
    -(void)showCorrectViewController:(id)sender
    {
        self.correctViewController = [[HFBCorrectViewController alloc] init];
        self.correctViewController.delegate = self;
        self.correctViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
        [self presentViewController:self.correctViewController animated:YES completion:^(void){
            NSLog(@&quot;Completed Presenting correctViewController&quot;);
            [self setUpViewForNextQuestion];
        }];
    }

presentViewController:animated:YES view will not appear until user taps again

I have a question about `iOS UIKeyboard`.

I have a `UITextField` and I would to have the `keyboard` with only uppercase characters.

I use a `storyboard` and I tried to set the `Cpitalization` as &quot;`All characters`&quot; to `UITextField properties`.

But this not solve my problem...any suggestion?

Uppercase characters in UItextfield

So we&#39;re in 2014, is there any way to set custom fonts within Interface Builder yet? Ie don&#39;t do it programmatically, except for &quot;Fonts provided by application&quot; in the app&#39;s plist.

Custom fonts in Interface Builder

In macOS how can I create a window with an &quot;integrated title bar and toolbar&quot; in Xcode and/or Interface Builder?

This is the &quot;fat title bar&quot; type of window that was added to apps such as Safari and Calendar in OS X 10.10 Yosemite. Unified title bar and toolbar plus other gadgets.

 &gt; [macOS Human Interface Guidelines: Title Bar and Toolbar](https://developer.apple.com/design/human-interface-guidelines/macos/windows-and-views/window-anatomy/)
 &gt;
 &gt; A toolbar, when included, resides beneath the title bar **(or is integrated with the title bar)** and includes controls—known as toolbar items—that provide quick access to frequently used commands and features.
 &gt;
 &gt; [![Integrated title bar and toolbar][1]][1]
 &gt;
 &gt; *Integrated title bar and toolbar*

  [1]: https://i.stack.imgur.com/vj6Ue.png

macOS window with integrated title bar and toolbar?

I&#39;m trying to replicate the Stanford Matchismo game from &quot;Developing ios7 apps for iphone and ipad&quot; in iTunesU in Swift.

On page 77 of the 3rd lecture [slides](https://itunes.apple.com/us/course/developing-ios-7-apps-for/id733644550#), it shows using an `IBOutletCollection` which isn&#39;t an option on Swift.  The Swift doc example shows one example that has an array of `IBOutlet`, but I can&#39;t figure out how to make Interface Builder connect multiple outlets to the same `IBOutlet`/`IBOutlet` Array.

Has anyone figured out how to do this yet?  

I know that I can create 12 outlets and deal with it that way, but I&#39;d like to make this work as closely as possible to the example in the lecture slides.

Swift - IBOutletCollection equivalent

I&#39;m using XCode6 beta and trying out Swift. When I put some auto layout constraints in a view controller the app crashes with the following error:
    `Terminating app due to uncaught exception &#39;NSInvalidUnarchiveOperationException&#39;, reason: &#39;Could not instantiate class named IBNSLayoutConstraint&#39;`

Could not instantiate class named IBNSLayoutConstraint

Built a new project from scratch in Swift in Xcode 6 (Beta 1) and have seen some strange behaviour with Storyboards and the output that I am viewing.

I have built a simple interface (as shown below) - with properties of View Controller included.
When I run this in the simulator I would expect &#39;Hello, World&#39; to be central in the user interface - however it seems that this &#39;Square&#39; is simply being fit into the iPhone screen and thus the wrong view is being shown (see below).

**My question is: has anyone else seen this behaviour and how did they fix it?** 

Thanks!

![View from the Storyboard Editor][1]


![Attributes Inspector][2]


![Size Inspector][3]


![Simulator Output][4]


  [1]: http://i.stack.imgur.com/ReaHU.png
  [2]: http://i.stack.imgur.com/ZoAiW.png
  [3]: http://i.stack.imgur.com/LIVK2.png
  [4]: http://i.stack.imgur.com/wVXtH.png

Xcode 6 Storyboard the wrong size?

I keep getting &#39;Unable to simultaneously satisfy constraints&#39; exceptions (Xcode 5, iOS 7, both device and simulator), where one of the constraints in the list is something like this:

    &quot;&lt;NSLayoutConstraint:0x165b23d0 &#39;UIView-Encapsulated-Layout-Width&#39;
    H:[StoryPlayerCell:0x165affc0(0)]&gt;&quot;

I did not set this constraint myself. It&#39;s also not an `NSAutoresizingMaskLayoutConstraint`.
But where does it come from? And how can I get rid of it?

I have no idea.
And I can&#39;t find anything about `&#39;UIView-Encapsulated-Layout-Width&#39;` in the Apple&#39;s documentation.
Even the Google search returns nothing at all.

Any suggestions?

PS: I&#39;m using this cell in a `UICollectionView` with a custom subclass of `UICollectionViewFlowLayout`. Maybe the `&#39;Encapsulated-Layout&#39;` part has something to do with this?

What is a &#39;UIView-Encapsulated-Layout-Width&#39; constraint?

What is the content compression resistance and content hugging of a UIView? How do these relate to the intrinsic content size of a view?

What is the content compression resistance and content hugging of a UIView?

My layout constraints are fine in Interface Builder but an exception occurs at runtime thanks to some part of the framework applying fixed height and width constraints that I really don&#39;t want. Why are they there, and how to turn them off?

They&#39;re the last two constraints shown in the logged list:

    2014-04-26 09:02:58.687 BBCNews[32058:60b] Unable to simultaneously satisfy constraints.
    	Probably at least one of the constraints in the following list is one you don&#39;t want. Try this: (1) look at each constraint and try to figure out which you don&#39;t expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you&#39;re seeing NSAutoresizingMaskLayoutConstraints that you don&#39;t understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
    (
        &quot;&lt;NSLayoutConstraint:0xbf478a0 UIView:0xbf4a3c0.height == 0.28125*UIView:0xbf4a3c0.width&gt;&quot;,
        &quot;&lt;NSLayoutConstraint:0xbf47190 UIView:0xbf4a3c0.leading == BNMyNewsCell_landscape:0xbf48b10.leading&gt;&quot;,
        &quot;&lt;NSLayoutConstraint:0xbf47160 UIView:0xbf4a3c0.trailing == BNMyNewsCell_landscape:0xbf48b10.trailing&gt;&quot;,
        &quot;&lt;NSLayoutConstraint:0xbf47130 BNMyNewsCell_landscape:0xbf48b10.bottom == UIView:0xbf4a3c0.bottom&gt;&quot;,
        &quot;&lt;NSLayoutConstraint:0xbf47100 UIView:0xbf4a3c0.top == BNMyNewsCell_landscape:0xbf48b10.top&gt;&quot;,
        &quot;&lt;NSLayoutConstraint:0xd4c3c40 &#39;UIView-Encapsulated-Layout-Width&#39; H:[BNMyNewsCell_landscape:0xbf48b10(304)]&gt;&quot;,
        &quot;&lt;NSLayoutConstraint:0xd4c38a0 &#39;UIView-Encapsulated-Layout-Height&#39; V:[BNMyNewsCell_landscape:0xbf48b10(290)]&gt;&quot;
    }
    Will attempt to recover by breaking constraint 
    
    &lt;NSLayoutConstraint:0xbf478a0 UIView:0xbf4a3c0.height == 0.28125*UIView:0xbf4a3c0.width&gt;




Auto-layout: What creates constraints named UIView-Encapsulated-Layout-Width &amp; Height?

I&#39;m asking this (somehow) simple question just to be finicky, because sometimes I&#39;m worried about a misuse I might be doing of many UIView&#39;s APIs, especially when it comes to autolayout.

To make it super simple I&#39;ll go with an example, let&#39;s assume I need an UIView subclass that has an image icon and a multiline label; the behaviour I want is that the height of my view changes with the height of the label (to fit the text inside), also, I&#39;m laying it out with Interface builder, so I have something like this:

![simple view image][1]

with some constraints that give fixed width and height to the image view, and fixed width and position (relative to the image view) to the label:

![simple view image, constraints shown][2]

Now, if I set  some text to the label, I want the view to be resized in height to fit it properly, or remain with the same height it has in the xib.
Before autolayout I would have done always something like this:

In the CustoView subclass file I would have overridden `sizeThatFits:` like so:

    - (CGSize) sizeThatFits:(CGSize)size{
    
        //this stands for whichever method I would have used
        //to calculate the height needed to display the text based on the font
        CGSize labelSize = [self.titleLabel intrinsicContentSize];
        
        //check if we&#39;re bigger than what&#39;s in ib, otherwise resize
        CGFloat newHeight = (labelSize.height &lt;= 21) ? 51: labelSize.height+20;
        
        size.height = newHeight;

        return size;

    }

And than I would have called something like:

    myView.titleLabel.text = @&quot;a big text to display that should be more than a line&quot;;
    [myView sizeToFit];

Now, thinking in constraints, I know that autolayout systems calls `intrinsicContentSize` on the view tree elements to know what their size is and make its calculations, therefore I should override `intrinsicContentSize` in my subview to return the exact same things it returns in the `sizeThatFits:` method previously shown, except for the fact that, previously, when calling `sizeToFit` I had my view properly resized, but now with autolayout, in combination with a xib, this is not going to happen.

Of course I might be calling `sizeToFit` every time I edit text in my subclass, along with an overridden `intrinsicContentSize` that returns the exact same size of `sizeThatFits:`, but somehow I don&#39;t think this is the proper way of doing it.

I was thinking about overriding `needsUpdateConstraints` and `updateConstraints`, but still makes not much sense since my view&#39;s width and height are inferred and translated from autoresizing mask from the xib.

So long, what do you think is the cleanest and most correct way to make exactly what I show here and support fully autolayout? 

  [1]: http://i.stack.imgur.com/P5GvC.png
  [2]: http://i.stack.imgur.com/XsKSt.png

Proper usage of intrinsicContentSize and sizeThatFits: on UIView Subclass with autolayout

Hi I am developing iPhone application in which I tried to set one side border for edittext. I did this in following way:

     int borderWidth = 1;
    CALayer *leftBorder = [CALayer layer];
   
    leftBorder.borderColor = [UIColor whiteColor].CGColor;
    leftBorder.borderWidth = borderWidth;
    
    leftBorder.frame = CGRectMake(0, textField.frame.size.height - borderWidth, textField
                                  .frame.size.width, borderWidth);
    [textField.layer addSublayer:leftBorder];

I put some constraints on my edittext in IB so that when I rotate my device it will adjust width of text field according to that. My problem is that adjusts the width of edittext not adjusting the width of CALayer which I set for my edit text. So I think I have to put some constraints for my CALayer item as well. But I dont know how to do that. ANy one knows about this? Need Help. Thank you.

Content Type	Original Author	Original Content on Stackoverflow
Question	brigadir	View Question on Stackoverflow
Solution 1 - Ios	Fogmeister	View Answer on Stackoverflow
Solution 2 - Ios	anatoliy_v	View Answer on Stackoverflow
Solution 3 - Ios	brigadir	View Answer on Stackoverflow
Solution 4 - Ios	user3474985	View Answer on Stackoverflow

iOS autolayout to center my view between two views

Ios Problem Overview

Ios Solutions

Solution 1 - Ios

Solution 2 - Ios

Solution 3 - Ios

Solution 4 - Ios

Error 0xc0202049: Data Flow Task 1: Failure inserting into the read-only column

How do I open a new fragment from another fragment?

Attributions