&gt; When it is checked, iOS will draw the entire area covered by the
&gt; object in transparent black before it actually draws the object.&lt;br /&gt;It is
&gt; rarely needed.

----------
[Beginning IOS 5 Development: Exploring the IOS SDK, page 81, paragraph3.][1]


  [1]: http://books.google.com.ua/books?id=sikKz-oQNFIC&amp;lpg=PA88&amp;ots=Bs5y9c16Pn&amp;dq=Clear%20Graphics%20Context%20checkbox&amp;hl=ru&amp;pg=PA81#v=onepage&amp;q&amp;f=false

It will apply an OpenGL **`&quot;clear context&quot;`** before starting the DrawRect function of the UIView:

    glClearColor(0, 0, 0, 0);
    glClear(GL_COLOR_BUFFER_BIT);

It&#39;s just underlining the matched brackets, Is it possible to make it more useful like changing brackets colour or highlighting the line of brackets?

How to change style of matched brackets in Sublime Text 2 / 3?

I want to download a zip file from the internet and unzip it in memory without saving to a temporary file. How can I do this?

Here is what I tried:

    var url = &#39;http://bdn-ak.bloomberg.com/precanned/Comdty_Calendar_Spread_Option_20120428.txt.zip&#39;;
        
    var request = require(&#39;request&#39;), fs = require(&#39;fs&#39;), zlib = require(&#39;zlib&#39;);
            
      request.get(url, function(err, res, file) {
         if(err) throw err;
         zlib.unzip(file, function(err, txt) {
            if(err) throw err;
            console.log(txt.toString()); //outputs nothing
         });
      });

[EDIT]
As, suggested, I tried using the adm-zip library and I still cannot make this work:

    var ZipEntry = require(&#39;adm-zip/zipEntry&#39;);
    request.get(url, function(err, res, zipFile) {
            if(err) throw err;
            var zip = new ZipEntry();
            zip.setCompressedData(new Buffer(zipFile.toString(&#39;utf-8&#39;)));
            var text = zip.getData();
            console.log(text.toString()); // fails
        });

How to download and unzip a zip file in memory in NodeJs?

In Xcode 4.3, when you choose some UIView object placed in .xib, you can find out there is an option saying &quot;Clear Graphics Context&quot;. What does it means?

What does &quot;Clear Graphics Context&quot; means?

<p>In Xcode 4.3, when you choose some UIView object placed in .xib, you can find out there is an option saying "Clear Graphics Context". What does it means?</p>


I&#39;m trying to show changes made to a `UITextField` on a separate `UILabel`. Is there  a way to capture full text of the `UITextField` after each character the user types in? Currently I&#39;m using this method, but it does not capture the last character that the user has entered. 

I know that `UITextView` has &quot;didChange&quot; method, but I could not find that method for a `UITextField`. 

    //does not capture the last character

    -(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
    {
    
            [self updateTextLabelsWithText: textField.text];
    
        return YES;
    }

**How can I take text out of UITextField after each character entered?**

Thank you!

iPhone how to get UITextField&#39;s text while typing?

I&#39;m trying to do an application reading pdf using pdf kit in Xcode 4.3 but it gives me the following error 

    
    ld: duplicate symbol _OBJC_METACLASS_$_OverlayManager in /Users/dt4it/Library/Developer/Xcode/DerivedData/MyPdf4-bmkjglhhvneluqcbwpceiqjvdcmq/Build/Intermediates/MyPdf4.build/Debug-iphonesimulator/MyPdf4.build/Objects-normal/i386/OverlayManager-D0866CFD31A05E68.o and /Users/dt4it/Library/Developer/Xcode/DerivedData/MyPdf4-bmkjglhhvneluqcbwpceiqjvdcmq/Build/Intermediates/MyPdf4.build/Debug-iphonesimulator/MyPdf4.build/Objects-normal/i386/OverlayManager-B31AE7412100AF6D.o for architecture i386
    Command /Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang failed with exit code 1


any help please ??

Command /Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang failed with exit code 1

I&#39;m learning about concurrent programming for iOS. So far I&#39;ve read about [`NSOperation`/`NSOperationQueue`][1] and [`GCD`][2]. **What are the reasons for using `NSOperationQueue` over `GCD` and vice versa?**

Sounds like both `GCD` and `NSOperationQueue` abstract away the explicit creation of `NSThreads` from the user. However the relationship between the two approaches isn&#39;t clear to me so any feedback to appreciated!


  [1]: http://www.cimgf.com/2008/02/16/cocoa-tutorial-nsoperation-and-nsoperationqueue/
  [2]: https://en.wikipedia.org/wiki/Grand_Central_Dispatch

NSOperation vs Grand Central Dispatch

I am using RGB values of a color from Photoshop and using the same in Xcode the values are.Color-R-160,G-97,B-5...the color in Photoshop appears yellowish but in Xcode when I used

    myLabel.textColor = [UIColor colorWithRed:160 green:97 blue:5 alpha:1] ;

the color appears whitish.

Why this difference is happening?


Making RGB color in Xcode

I have app called &quot;X&quot;. It&#39;s already approved in the app store. Now I want it to be called &quot;X Pro&quot; for some reasons. What should I edit in plist or ITC to change this name? I guess I should change bundle_name or bundle_display_name, but will it change app name in the App Store or it will change just name on the device?

Create new app in ITC is not an option coz app is already approved. Thanks!

change app name in App Store

I&#39;ve laid out some subviews with Interface Builder, but I&#39;d like to do it in code instead.

I&#39;ve read the  [UIView docs][UIViewAutoresizing] about setting the `view.autoresizingMask` property. I&#39;m looking for a logical explanation of how to translate the *struts* and *springs* by using the various masks offered (e.g., `UIViewAutoresizingFlexibleLeftMargin`, etc).

[UIViewAutoresizing]: http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIView_Class/UIView/UIView.html#//apple_ref/c/tdef/UIViewAutoresizing
 

How to use UIView autoresizingMask property programmatically?

When creating an iOS app, I&#39;m confused as to when exactly I need to call `setNeedsDisplay`?  I know that it has something to do with updating/redrawing the UI; however, do I need to call this every time I change any of my views?

For example, do I need to call it:

- After programatically changing the text in a text field
- When changing the background of a view?
- When I make changes in viewDidLoad? 
- How about in viewDidAppear?

Could someone give me some general guidelines regarding when to use this method?

When do I need to call setNeedsDisplay in iOS?

I&#39;m looking to have a border around a `UIView` I have just to separate it from the main view visually.

I have looked in the settings for the `UIView` in storyboard editor but I can&#39;t seem to find anything for setting a border.

Is there an easy way to do this in code?


Is there an easy way to add a border to a view in Xcode for iOS 5.1

I have a UIView, it is not inside UIScrollView. I would like to move up my View when the keyboard appears. Before I tried to use this solution: https://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present.

It was working fine. But after inserting the data in the textfields, it takes me to another view, and when I get back to this page, its just jumping, and I couldn&#39;t see my text fields. Is there any better solution for this problem?

Move UIView up when the keyboard appears in iOS

I want to know how to simply mask the visible area of a UIView of any kind. All the answers/tutorials I&#39;ve read so far describe masking with an image, gradient or creating round corners which is way more advanced than what I am after.

Example: I have a UIView with the bounds (0, 0, 100, 100) and I want to cut away the right half of the view using a mask. Therefore my mask frame would be (0, 0, 50, 100).

Any idea how to do this simply? I don&#39;t want to override the drawrect method since this should be applicable to any UIView.

I&#39;ve tried this but it just makes the whole view invisible.

    CGRect mask = CGRectMake(0, 0, 50, 100);
    UIView *maskView = [[UIView alloc] initWithFrame:mask];
    viewToMask.layer.mask = maskView.layer;

Content Type	Original Author	Original Content on Stackoverflow
Question	SeanFang	View Question on Stackoverflow
Solution 1 - Ios	Reshat Belyalov	View Answer on Stackoverflow
Solution 2 - Ios	Antoine Rosset	View Answer on Stackoverflow

What does "Clear Graphics Context" means?

Ios Problem Overview

Ios Solutions

Solution 1 - Ios

Solution 2 - Ios

How to download and unzip a zip file in memory in NodeJs?

How to change style of matched brackets in Sublime Text 2 / 3?

Attributions