I tried both with and without and diffed the generated files. 

The only difference it makes is whether the pre-built `shouldAutorotate:` method returns YES to all orientations (normal for iPad apps) or just for portrait (normal for iPhone apps). It also changes the dimensions of the UIView in the generated XIB file (if you tick the option to create one) from iPhone to iPad screen size.

So just choose whichever one sounds like the best starting point for the class you&#39;re about to create. Both things are trivial to edit later.

Consider the following (fragile) JavaScript code:

    var img = new Image;
    img.src = &quot;data:image/png;base64,...&quot;; // Assume valid data

    // Danger(?) Attempting to use image immediately after setting src
    console.log( img.width, img.height );
    someCanvasContext.drawImage( img, 0, 0 );
    
    // Danger(?) Setting onload after setting src
    img.onload = function(){ console.log(&#39;I ran!&#39;); };

**The Question(s)**

* Should the image width and height be correct immediately?
* Should the canvas draw work immediately?
* Should the `onload` callback (set after the src was changed) be invoked?

**Experimental Tests**  
I created a [simple test page](http://phrogz.net/tmp/img_via_dataurl.html) with similar code. In Safari my first tests, both by opening the HTML page locally (`file:///` url) and loading it from my server, showed everything working: the height and width is correct, the canvas draw works, _and_ the `onload` also fires.

In Firefox v3.6 (OS X), loading the page after launching the browser shows that the height/width is not correct immediately after setting, `drawImage()` fails. (The `onload` handler does fire, however.) Loading the page again, however, shows the width/height being correct immediately after setting, and `drawImage()` working. It would appear that Firefox caches the contents of the data URL as an image and has it available immediately when used in the same session.

In Chrome v8 (OS X) I see the same results as in Firefox: the image is not available immediately, but takes some time to asynchronously &#39;load&#39; from the data URL.

In addition to experimental proof of what browsers the above does or does not work, I&#39;d really love links to specs on how this is supposed to behave. So far my Google-fu has not been up to the task.

**Playing It Safe**  
For those who don&#39;t understand why the above might be dangerous, know that you should use images like this to be safe:

    // First create/find the image
    var img = new Image;
    
    // Then, set the onload handler
    img.onload = function(){
      // Use the for-sure-loaded img here
    };

    // THEN, set the src
    img.src = &#39;...&#39;;

Should setting an image src to data URL be available immediately?

I have created a Custom Validation Attribute:

    public class FutureDateAttribute : ValidationAttribute
        {
            public override bool IsValid(object value) 
            {
                if (value == null|| (DateTime)value &lt; DateTime.Now)
                    return false;
    
                return true;
            }
            
        }

How can I get this to work on client side too with jquery?

Perform client side validation for custom attribute

In Xcode when creating a subclass of UIViewController, an checkbox named &quot;Targeted for iPad&quot; exists among others.  
What if I want to create an app that runs on iPhone and iPad (I think it is called universal application)? should I check it?  
If I checked it, what is happening under the hood?

Targeted for iPad option in Xcode

<p>In Xcode when creating a subclass of UIViewController, an checkbox named "Targeted for iPad" exists among others.<br>
What if I want to create an app that runs on iPhone and iPad (I think it is called universal application)? should I check it?<br>
If I checked it, what is happening under the hood?</p>


In iPhone App,
while running the App on device How to detect the screen resolution of the device on which App is running?

in iPhone App How to detect the screen resolution of the device

I doubt this is possible without extensive jail-breaking, but is it at all possible to edit the iPad&#39;s (or any iOS device&#39;s) hosts file?

Can I edit an iPad&#39;s host file?

Is there an easy way to delete all the files(images) I saved in the documents folder of the app?

Deleting all the files in the iPhone sandbox (documents folder)?

How can I detect if the phone is in airplane mode? (It&#39;s not enough to detect there is no internet connection, I have to be able to distinguish these 2 cases)

Detect airplane mode on iOS

I am trying to debug some inconsistent behaviour I am seeing in an application that gets its primary data from the Internet.  I don&#39;t see the issues in the simulator, just on the device, so I&#39;d like to reproduce the network and connectivity environment in the simulator.

Is there a way of disabling the network in the simulator?

(I am connecting to the Mac remotely to code, and there isn&#39;t any other choice right now, so disabling the OS network isn&#39;t an option).



Is it possible to disable the network in iOS Simulator?

I want to convert `string` `data` to `NSInteger`.

Convert NSString to NSInteger?

When posting an in-app purchase with Apple they ask for a screenshot to be included before going to review.

What kind of screenshots do they want?

My in-app purchase unlocks some of the lite version, I&#39;m not sure what Apple wants to see here.

iPhone in-app purchase screen shot

How can I change the separator line that appears at the end of each cell in UITableView?
I want to have an image that is a thin separator type line image. 


UITableView Separator line

Maybe this will be obviously simple for most of you, but could you please give an example how to create similar methods (in Objective-C) and functions in C to create functions like `NSString`&#39;s `stringWithFormat:`, or `NSLog()`.

Just to remind:

    [NSString stringWithFormat:@&quot;example tekst %i %@ %.2f&quot;, 122, @&quot;sth&quot;, 3.1415&quot;];
    NSLog(@&quot;account ID %i email %@&quot;, accountID, email);

I&#39;d like to create the similar to `NSString`&#39;s method `stringWithFormat:`, `NSURL - urlWithFormat`.

How to create variable argument methods in Objective-C

I am working on an iPhone app. I am a full-time Java developer and I am used to using Eclipse where I can put a breakpoint in and stop the process. Then, I can type in any expression that I want and Eclipse will evaluate it using the values from that point in the process.

Is there a way to do that in Xcode? I want to be able to stop at a breakpoint and then enter some code to evaluate it. The gdb console will let me do `po` ([print-object][1]), but it is really limited. Any help?


  [1]: http://support.apple.com/kb/ta45906

Xcode evaluating expressions while debugging

I am getting this error while launching the application on device:

    Error launching remote program: No such file or directory (/private/var/mobile/Applications/3E6A33F8-52EE-4A0B-AB9F-A122B7C42045/Test.app/Test)




Error while launching the application on device

&gt; SplitView[1290:307] Could not load the &quot;canary04.png&quot; image referenced from a nib in the bundle with identifier &quot;xx.co.mycompany.ipad.SplitView&quot;

I only get the error when running on the device.  There are no problems running in simulator.

I am using the image directly in interface builder with an UIImageView.

EDIT: I have added a different new image to a different nib and that works no problems.

Anyone have any ideas?

Could not load the image referenced from a nib in the bundle running on device

When I&#39;m stopped at a break point in Xcode, I can see the value of NSString variables. How can I change them? I can change int or double variables, but not NSString.

How to change NSString value while debugging in Xcode?

I have been struggling with fixed positioning in iPad for a while. I know [iScroll][1] and it does not always seem to work (even in their demo). I also know that Sencha has a fix for that, but I couldn&#39;t &lt;kbd&gt;Ctrl&lt;/kbd&gt; + &lt;kbd&gt;F&lt;/kbd&gt; the source code for that fix.

I am hoping that someone may have the solution. The problem is that fixed positioned elements do not get updated when the user pans down/up on an iOS powered mobile Safari.


  [1]: http://cubiq.org/iscroll

position: fixed doesn&#39;t work on iPad and iPhone

I have a single image I want as the background for my app no matter what viewcontroller they are on - how do you accomplish this?

set background image for entire iPhone / iPad app

I am developing an HTML application for the iPad. As such it utilizes touch events and webkit-CSS animations.

Up until now I have used chrome as my debugging environment because of it&#39;s awesome developer mode.

What I would like is to be able to debug my Html/JavaScript using Google-Chrome&#39;s debugger on my PC while simulating touch events with my mouse.

My site does not have any multi-touch events and no mouse events (no mouse on iPad).

I am not actually interested in seeing the applications layout, but more in debugging its behavior.

Is there some plugin to get mouse events translated into touch events on a desktop browser?


Simulating touch events on a PC browser

We&#39;d like to &#39;lock-down&#39; an iPhone/iPod/iPad so that the user can only run one app (we&#39;ve developed this app internally). I&#39;m guessing we&#39;d be looking at jailbreaking, and then replacing (?) the default Springboard app. 

Can we do this? If so, how?

---

**EDIT: iOS 7 now includes an &#39;App Lock&#39; payload** as part of the device configuration profile. From the Apple docs:
&gt; *&quot;By installing an app lock payload, the device is locked to a single application until the payload is removed. The home button is disabled, and the device returns to the specified application automatically upon wake or reboot.&quot;*

Read more about it here:  
https://developer.apple.com/business/documentation/Configuration-Profile-Reference.pdf


Content Type	Original Author	Original Content on Stackoverflow
Question	Chiron	View Question on Stackoverflow
Solution 1 - Ios	grahamparks	View Answer on Stackoverflow

Targeted for iPad option in Xcode

Ios Problem Overview

Ios Solutions

Solution 1 - Ios

Perform client side validation for custom attribute

Should setting an image src to data URL be available immediately?

Attributions