Apple changed all sorts of shortcuts, but to switch between header and implementation, the new shortcut is,

&lt;kbd&gt;⌃&lt;/kbd&gt; + &lt;kbd&gt;⌘&lt;/kbd&gt; + &lt;kbd&gt;↑&lt;/kbd&gt;/&lt;kbd&gt;↓&lt;/kbd&gt;

You can change it back to the previous &lt;kbd&gt;⌥&lt;/kbd&gt; + &lt;kbd&gt;⌘&lt;/kbd&gt; +  &lt;kbd&gt;↑&lt;/kbd&gt;/&lt;kbd&gt;↓&lt;/kbd&gt; in `Preferences` &gt; `Key Bindings`.

Look for the **Jump to Next Counterpart** and **Jump to Previous Counterpart** commands.

If you are working on a big screen, you could use the Assistant layout&#39;s split view, and have the .h and .m files side by side.

[Hither be the Grand Unified Gigantic Sheet of Xcode 4 Keybindings.][1]

    Download it.
    Preview it.
    Print it.
    Read it.
    Know it.
    Use it.
    Be it.

  [1]: http://cocoasamurai.blogspot.com/2011/03/xcode-4-keyboard-shortcuts-now.html


You can also use the 3 finger swipe up or down gesture on a trackpad.

The commands we&#39;re looking for are in the `Navigate` menu bar item.

`Jump to Next Counterpart`

and

`Jump to Previous Counterpart`

Once you have the menu item names, these can be assigned to any keyboard shortcut.

I am trying to connect minicom to a serial device that is connected via a USB-to-serial adapter. This is a PL2303 and from everything I&#39;ve read no additional drivers are required. The device is recognised as a PL2303.

I&#39;m a beginner at minicom. Is this the correct command to execute? Or do I need to configure something?

    $ sudo minicom --device /dev/ttyUSB0
    minicom: cannot open /dev/ttyUSB0: No such file or directory

    $ sudo lsusb -v

    Bus 002 Device 006: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
    Device Descriptor:
      bLength                18
      bDescriptorType         1

    $ tail /var/log/syslog  #then removed and attached the device.
    Mar 13 23:31:49 ubuntu kernel: [807996.786805] usb 2-1: pl2303 converter now attached to ttyUSB0
    Mar 13 23:34:44 ubuntu kernel: [808172.155129] usb 2-1: USB disconnect, address 7
    Mar 13 23:34:44 ubuntu kernel: [808172.156321] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
    Mar 13 23:34:44 ubuntu kernel: [808172.156374] pl2303 2-1:1.0: device disconnected
    Mar 13 23:34:52 ubuntu kernel: [808179.497856] usb 2-1: new full speed USB device using uhci_hcd and address 8
    Mar 13 23:34:52 ubuntu kernel: [808179.785845] pl2303 2-1:1.0: pl2303 converter detected
    Mar 13 23:34:52 ubuntu kernel: [808179.872309] usb 2-1: pl2303 converter now attached to ttyUSB0


How do I connect to a terminal to a serial-to-USB device on Ubuntu 10.10 (Maverick Meerkat)?

When to use hashmaps or treemaps?

I know that I can use TreeMap to iterate over the elements when I need them to be sorted.
But is just that? There is no optimization when I just want to consult the maps, or some optimal specific uses?


TreeMap or HashMap?

Just installed Xcode 4 so far so good, except that Apple changed all the keyboard shortcuts! Anyone know how to toggle between .h and .m?

How to toggle between .h and .m in Xcode 4

<p>Just installed Xcode 4 so far so good, except that Apple changed all the keyboard shortcuts! Anyone know how to toggle between .h and .m?</p>


I have heard people state that method swizzling is a dangerous practice. Even the name swizzling suggests that it is a bit of a cheat.

[Method Swizzling][1] is modifying the mapping so that calling selector A will actually invoke implementation B. One use of this is to extend behavior of closed source classes. 

Can we formalise the risks so that anyone who is deciding whether to use swizzling can make an informed decision whether it is worth it for what they are trying to do.

E.g.

 * **Naming Collisions**: If the class later extends its functionality to include the method name that you have added, it will cause a huge manner of problems. Reduce the risk by sensibly naming swizzled methods.


  [1]: https://web.archive.org/web/20130308110627/http://cocoadev.com/wiki/MethodSwizzling

What are the Dangers of Method Swizzling in Objective-C?

I&#39;m getting this warning when I&#39;m calling a local routine.

My code is this:

    -(void)nextLetter {
    	// NSLog(@&quot;%s&quot;, __FUNCTION__);
    	currentLetter ++;
    	if(currentLetter &gt; (letters.count - 1))
    	{
    		currentLetter = 0;
    	}
    	self.fetchLetter;
    }

I&#39;m getting the warning on the self.fetchLetter statement.

That routine looks like this:

    - (void)fetchLetter {
    	// NSLog(@&quot;%s&quot;, __FUNCTION__);
    	NSString *wantedLetter = [[letters objectAtIndex: currentLetter] objectForKey: @&quot;langLetter&quot;];
    	
    	NSString *wantedUpperCase = [[letters objectAtIndex: currentLetter] objectForKey: @&quot;upperCase&quot;];	
    	
    
    .....	
    }

I prefer to fix warning messages, is there a better way to write this?

Thanks!	

 

Xcode warning &quot;Property access results unused - getters should not be used for side effects&quot;

When obtaining a UIImage of a video via AVAssetImageGenerator, I&#39;m getting back images rotated (well, technically they&#39;re not) when the video is shot in portrait orientation.  How can I tell what orientation the video was shot and then rotate the image properly?

    AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:url options:nil];
    AVAssetImageGenerator *generate = [[AVAssetImageGenerator alloc] initWithAsset:asset];
    NSError *err = NULL;
    CMTime time = CMTimeMake(0, 60);
    CGImageRef imgRef = [generate copyCGImageAtTime:time actualTime:NULL error:&amp;err];
    [generate release];
    UIImage *currentImg = [[UIImage alloc] initWithCGImage:imgRef];

AVAssetImageGenerator provides images rotated

I&#39;ve created a view in a xib (with an activity indicator, a progress view and a label).
Then I&#39;ve created .h/.m files:

    #import &lt;UIKit/UIKit.h&gt;

    @interface MyCustomView : UIView {
        IBOutlet UIActivityIndicatorView *actIndicator;
        IBOutlet UIProgressView *progressBar;
        IBOutlet UILabel *statusMsg;
    }

    @end

    #import &quot;MyCustomView.h&quot;
      
    @implementation MyCustomView    

    - (id)initWithFrame:(CGRect)frame {
        if ((self = [super initWithFrame:frame])) {
            // Initialization code
        }
        return self;
    }

    - (void)dealloc {
        [super dealloc];
    }

    @end


**In IB, I set the file&#39;s owner and view identity to MyCustomView and connect the IBOutlet to the File&#39;s owner**

In MyViewController.m, I&#39;ve:

    - (void)viewDidLoad {

        [super viewDidLoad];   

        UIView *subView = [[MyCustomView alloc] initWithFrame:myTableView.frame];
        [subView setBackgroundColor:[UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.5]];

        [myTableView addSubview:subView];
        [subView release];
    }

When I run the app, the view is added, but I can&#39;t see the label, the progress bar and the activity indicator. 

What am I doing wrong?

Adding a custom subview (created in a xib) to a view controller&#39;s view - What am I doing wrong

Is there a relatively easy way of looping a video in AVFoundation?  

I&#39;ve created my AVPlayer and AVPlayerLayer like so:

    avPlayer = [[AVPlayer playerWithURL:videoUrl] retain];
    avPlayerLayer = [[AVPlayerLayer playerLayerWithPlayer:avPlayer] retain];

    avPlayerLayer.frame = contentView.layer.bounds;
    [contentView.layer addSublayer: avPlayerLayer];

and then I play my video with:

    [avPlayer play];

The video plays fine but stops at the end.  With the MPMoviePlayerController all you have to do is set its `repeatMode` property to the right value.  There doesn&#39;t appear to be a similar property on AVPlayer.  There also doesn&#39;t seem to be a callback that will tell me when the movie has finished so I can seek to the beginning and play it again.

I&#39;m not using MPMoviePlayerController because it has some serious limitations.  I want to be able to play back multiple video streams at once.


Looping a video with AVFoundation AVPlayer?

I am trying to integrate Janrain Engage as custom module with Appcelerator Titanium. I have created a sample module and dragged the JREngage folder to the sample module xcodeproj as indicated in the Jainrain&#39;s documentation. 

Now I give build command to this project, then execute the `./build.py` and then finally I execute the `titanium run` command. It launches the application in simulator with a blank screen and immediately crashes throwing the following error.


&gt; Terminating app due to uncaught exception &#39;NSInternalInconsistencyException&#39;, reason: &#39;Could not load NIB in bundle: &#39;NSBundle &amp;lt;/Users/abhilash/Library/Application Support/iPhone Simulator/4.2/Applications/CA167346-4091-4E16-B841-955D1D391713/test.app&amp;gt; (loaded)&#39; with name &#39;JRProvidersController&#39;&#39;


Why could this error be occurring? 

Could not load NIB in bundle

I&#39;ve been looking all over Xcode for this, but I can&#39;t find any place that allows you to rename an existing scheme in Xcode 4. Is this even possible?


Is there a way to rename an Xcode 4 scheme?

I just updated to Xcode 4.

Normally when localizing apps we add &quot;Localizable.String&quot; file to the project, and then navigate to &quot;Get Info&quot; menu and click the &quot;Make It Localized&quot; button.

However, in Xcode 4, there is no &quot;Get Info&quot; menu.

When I try to add a language it only effects the &quot;InfoPlist.String&quot; file (which can only localize the app&#39;s name).

How may I add localization to my app in Xcode 4?

Localizing in Xcode 4 with Localizable.String

Xcode finally added tabs but the problem is that they behave very strange. For example they will keep a tab open only if it was opened to a new tab.

If you open a file just by clicking in the project tree, Xcode will close your tab as soon as you are clicking on another file in the tree.

Is is possible to make them behave like real tabs and prevent Xcode from reusing them? How?


How can I make the tabs work normally on Xcode 4?

Is there a way to check if a modal view is present? I&#39;d like to run a method only if a modal view is present. Also, if I have multiple modal views, is there a way to check if a certain modal view is present.

I use the following code to present and dismiss modal views:

        [self presentModalViewController:myModalView animated:YES];
        [self dismissModalViewControllerAnimated:YES];
    

Thank you in advance!

Cheers,
Evan

PS. My modal view has a view controller, but I&#39;d like to check if the modal view is present from a separate class that is running asynchronously.

iOS - How to check if a modal view is present

I have a view with about 30 subviews on it.  I want to add code in my subview&#39;s viewcontroller so that when I tap the subview, the subview expands to fill the screen.

I&#39;m using `[self.view setFrame:rect]` to expand the subview, and this works fine.  The problem is that some of the other 29 subviews are above the subview that I just tapped, so they&#39;re still visible.

I&#39;ve tried using `bringSubviewToFront` from the parent viewcontroller, but this appears to have no effect.  Is there any code I can put in my subview&#39;s viewcontroller class to make this happen?

Content Type	Original Author	Original Content on Stackoverflow
Question	Ali	View Question on Stackoverflow
Solution 1 - Objective C	Anurag	View Answer on Stackoverflow
Solution 2 - Objective C	bbum	View Answer on Stackoverflow
Solution 3 - Objective C	Jeff Youel	View Answer on Stackoverflow
Solution 4 - Objective C	pkamb	View Answer on Stackoverflow

How to toggle between .h and .m in Xcode 4

Objective C Problem Overview

Objective C Solutions

Solution 1 - Objective C

Solution 2 - Objective C

Solution 3 - Objective C

Solution 4 - Objective C

TreeMap or HashMap?

How do I connect to a terminal to a serial-to-USB device on Ubuntu 10.10 (Maverick Meerkat)?

Attributions