Actually the documentation is pretty clear about this:

- [setNeedsLayout](http://developer.apple.com/library/ios/documentation/uikit/reference/uiview_class/UIView/UIView.html#//apple_ref/doc/uid/TP40006816-CH3-SW28) will layout subviews

  &gt; Call this method on your application’s main thread when you want to adjust the layout of a view’s subviews.
- [setNeedsDisplay](http://developer.apple.com/library/ios/documentation/uikit/reference/uiview_class/UIView/UIView.html#//apple_ref/doc/uid/TP40006816-CH3-BBCCADHC) will call for a redraw of your view (`drawRect:`, etc).

  &gt; You can use this method or the setNeedsDisplayInRect: to notify the system that your view’s contents need to be redrawn. 



I have tried for several days to solve this problem, using the Dungeons demo code that comes with the SDK. I&#39;ve tried to Google for an answer but can&#39;t find one.

   - In the Dungeons demo, I passed my public key from the dev console.
   - Signed the apk and uploaded to console without publish.
   - Testing for both `android.test.purchased` &amp; product list created on  console with published for subscription (The main feature I want for my app).

But still I get an error of `Signature verification failed` and then the signature does not match data. How can I solve this?

    public static ArrayList&lt;VerifiedPurchase&gt; verifyPurchase(String signedData, String signature)
    {
        if (signedData == null) {
            Log.e(TAG, &quot;data is null&quot;);
            return null;
        }
        if (Consts.DEBUG) {
            Log.i(TAG, &quot;signedData: &quot; + signedData);
        }
        boolean verified = false;
        if (!TextUtils.isEmpty(signature)) {
           
            String base64EncodedPublicKey = &quot;MIIBIjA....AQAB&quot;;
            PublicKey key = Security.generatePublicKey(base64EncodedPublicKey);
            verified = Security.verify(key, signedData, signature);
            if (!verified) {
                Log.w(TAG, &quot;signature does not match data.&quot;);
                return null;
            }
        }
    }
    
    public static boolean verify(PublicKey publicKey, String signedData, String signature)
    {
        if (Consts.DEBUG) {
            Log.i(TAG, &quot;signature: &quot; + signature);
        }
        Signature sig;
        try {
            sig = Signature.getInstance(SIGNATURE_ALGORITHM);
            sig.initVerify(publicKey);
            sig.update(signedData.getBytes());
            if (!sig.verify(Base64.decode(signature))) {
                Log.e(TAG, &quot;Signature verification failed.&quot;);
                return false;
            }
            return true;
        } catch (NoSuchAlgorithmException e) {
            Log.e(TAG, &quot;NoSuchAlgorithmException.&quot;);
        } catch (InvalidKeyException e) {
            Log.e(TAG, &quot;Invalid key specification.&quot;);
        } catch (SignatureException e) {
            Log.e(TAG, &quot;Signature exception.&quot;);
        } catch (Base64DecoderException e) {
            Log.e(TAG, &quot;Base64 decoding failed.&quot;);
        }
        return false;
    }

Android in app purchase: Signature verification failed

My problem is: sometimes browser over-cached some resources even if i&#39;ve already modified them. But After F5, everything is fine.

I studied this case whole afternoon. Now i completely understood the point of &quot;Last-Modified&quot; or &quot;Cache-Control&quot;. And i know how to solve my **issue** (just .js?version or explicit max-age=xxxx). But the **problem** is still unsolved: how does browser handle the response header **without** &quot;Cache-Control&quot; like this:

    Content-Length: 49675
    Content-Type: text/html
    Last-Modified: Thu, 27 Dec 2012 03:03:50 GMT
    Accept-Ranges: bytes
    Etag: &quot;0af7fcbdee3cd1:972&quot;
    Server: Microsoft-IIS/6.0
    X-Powered-By: ASP.NET
    Date: Thu, 24 Jan 2013 07:46:16 GMT 

They clearly cache them when &quot;Enter in the bar&quot;

![enter image description here][1]

 


  [1]: http://i.stack.imgur.com/3hJnn.jpg

What&#39;s default value of cache-control?

What is the real difference between `UIView` methods `setNeedsLayout` and `setNeedsDisplay`?

As usual documentation is foggy about this.


setNeedsLayout and setNeedsDisplay

<p>What is the real difference between <code>UIView</code> methods <code>setNeedsLayout</code> and <code>setNeedsDisplay</code>?</p>
<p>As usual documentation is foggy about this.</p>


I am trying to write some iOS logic tests against classes in my project that use functionality from some of the libraries in my podspec. I am using the standard unit test bundle provided in Xcode (although not Application Tests, just Unit Tests).

For example, I use Magical Record, and I have that library linked in my podspec. It is present in the Pods project in my workspace, and works as expected when the app is running in the simulator or on the device. When I try to link to the test the object that uses Magical Record, however, I get a linker error stating that it can&#39;t find the selectors from Magical Record. I have tried updating my HEADER_SEARCH_PATH in my logic testing bundle, even hard coding it to the headers directory created by CocoaPods, but no luck.

I can run unit tests against classes that do not use CocoaPods libraries with no problem.

Am I going about this wrong? Should I be doing something else to get the compiler to see the CocoaPods libraries?

Libraries not found when using CocoaPods with iOS logic tests

i am trying to display a simple `UITableView` with some data. I wish to set the static height of the `UITableView` so that it doesn&#39;t displays empty cells at the end of the table. how do I do that?

code:

   

    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 
        NSLog(@&quot;%d&quot;, [arr count]);
        return [arr count];
    }

How to remove empty cells in UITableView?

At some point in my app I have a highlighted `UIButton` (for example when a user has his finger on the button) and I need to change the background color while the button is highlighted (so while the finger of the user is still on the button).

I tried the following:

    _button.backgroundColor = [UIColor redColor];

But it is not working. The color remains the same. I tried the same piece of code when the button is not highlighted and it works fine. I also tried calling `-setNeedsDisplay` after changing the color, it didn&#39;t have any effect.

How to force the button to change the background color?

How to change the background color of a UIButton while it&#39;s highlighted?

I have a `UITableView` which is populated from array and a drop down list.  
If I select any row of drop down list the array will be inserted with new values and tableview should get reloaded.

How to animate the tableview with new array contents? 


Animation like I want to show the row one by one. i tried this method 

    - (void)reloadRowsAtIndexPaths:(NSArray )indexPaths withRowAnimation:(UITableViewRowAnimation)animation { 
    NSIndexPath rowToReload = [NSIndexPath indexPathForRow:[names count] inSection:0];
     NSArray* rowsToReload = [NSArray arrayWithObjects:rowToReload, nil]; 
    [tableDetails reloadRowsAtIndexPaths:rowsToReload withRowAnimation:UITableViewRowAnimationNone];
     }

UITableview reloaddata with animation

I&#39;ve consulted many sources out there and still can&#39;t figure this out.

http://code.google.com/p/apns-php/wiki/CertificateCreation

Basically after I download the Development Push SSL Certificate from the iOS Provisioning Portal &gt; App IDS (with Enable for Apple Push Notification service selected) and I double click the certificate (filename aps_development.cer) to open it, the Keychain opens. I then select &quot;login&quot; and &quot;Certificates&quot; on the left panels.  On the right panel I see &quot;Apple Development IOS Push Services:...&quot; and all instructions I&#39;ve consulted so far have told me to &quot;expand&quot; this option by clicking the arrow next to the name to reveal the private key, but there is no expand option for this certificate. Can anyone help me find this private key? Did I download the wrong certificate?

Thanks

Can&#39;t find private key for Apple Development Push Services

I&#39;m trying to figure out how to do this with auto layout (iOS6) and constraints.

Basically I have my large view divided up into two sections on the bottom. Inside of those sections (currently subviews) I have an image view and a label. I want to center those on both sides, with variable length text.

My head is mostly wrapped around auto layout, but I&#39;m not sure the best approach to this. I&#39;m inclined to think it&#39;s not possible in IB, but is in code.

Going to continue trying to figure this out, but in the meantime here is the example I&#39;m trying to create.

![enter image description here][1]


  [1]: http://i.stack.imgur.com/0uR31.png

Auto Layout (Constraints) Center 2 side by side views in a parent view

have been getting into autolayouts recently and I&#39;m stuck on what seems like a really trivial problem example. I have a view that I want to sit at the top of the screen, and take up half of the screen-height. Simple before autolayout - just tack it in place and tell it to expand vertically when the superview resizes.

Now, I can&#39;t for the life of me see how to do it. Here&#39;s what I get when I try to set this up:

![autolayout blues][1]


  [1]: http://i.stack.imgur.com/Lo413.png

The bottom space constraint is set to &quot;equals 284&quot;, which is absolute and absolutely useless to me when I change to iPhone4 layout, as it keeps 284 points space at the bottom of the screen, and shrinks the view to no longer be half the size of the screen. And there&#39;s no way of setting that constraint to equal some fraction of any other view&#39;s height..

After struggling for a while, the only way I can think of doing this would be to introduce another view below this view, pin their heights equally, have them sit above and below each other and then set the second (bottom) view to be invisible.. which seems a bit ugly!

Am I missing something obvious?..

autolayout - make height of view relative to half superview height

I can&#39;t find a way to create a &#39;square&#39; constraint, meaning &#39;width equals height&#39; in Interface Builder. I guess it&#39;s possible to add such constraint programmatically. Is there something I can do in IB? Maybe I just don&#39;t see it? It seems trivial, yet I can&#39;t find it.

&quot;Width equals height&quot; constraint in Interface Builder

I can&#39;t find a clear answer on Apple documentation regarding Cocoa Autolayout about the difference between content hugging and compression resistance. 

Can somebody explain their usages and difference ? 

Cocoa Autolayout: content hugging vs content compression resistance priority

How am I supposed to configure programmatically (and in which method) a UILabel whose height depends on its text?  I&#39;ve been trying to set it up using a combination of Storyboard and code, but to no avail.  Everyone recommends `sizeToFit` while setting `lineBreakMode` and `numberOfLines`.  However, no matter if I put that code in `viewDidLoad:`, `viewDidAppear:`, or `viewDidLayoutSubviews` I can&#39;t get it to work.  Either I make the box too small for long text and it doesn&#39;t grow, or I make it too big and it doesn&#39;t shrink.

Content Type	Original Author	Original Content on Stackoverflow
Question	Duck	View Question on Stackoverflow
Solution 1 - Ios	Joris Kluivers	View Answer on Stackoverflow

setNeedsLayout and setNeedsDisplay

Ios Problem Overview

Ios Solutions

Solution 1 - Ios

What's default value of cache-control?

Android in app purchase: Signature verification failed

Attributions