Seems I needed to set rasterizationScale to the proper value for the device as follows.

    myView.layer.rasterizationScale = [[UIScreen mainScreen] scale];

I had a similar problem-- a rotated `UIView` with several `UIImageView` subviews. When I set the `rasterizationScale = 2.0`, the images became crisper, but this caused serration to reemerge. To fix this, I created a `containerView` that held the `UIView` and `UIIMageView`s (which were previously subviews of the UIView) and applied `rasterizationScale = 1.0` to the `UIView` and `rasterizationScale = 2.0` to the `UIImageView`s. Now everything looks quite nice.

@Jamie Hamick&#39;s answer in Swift 5:

myView.layer.rasterizationScale = UIScreen.main.scale

For data that is known to have seasonal, or daily patterns I&#39;d like to use fourier analysis be used to make predictions. After running fft on time series data, I obtain coefficients. How can I use these coefficients for prediction? 

I believe FFT assumes all data it receives constitute one period, then, if I simply regenerate data using ifft, I am also regenerating the continuation of my function, so can I use these values for future values? 

Simply put: I run fft for t=0,1,2,..10 then using ifft on coef, can I use regenerated time series for t=11,12,..20 ?  

Using fourier analysis for time series prediction

I have the following EF query:

    TestEntities db = new TestEntities();
    var questions = from q in db.Questions.Include(&quot;QuestionType&quot;)
                    from sq in db.SurveyQuestions
                    where sq.Survey == surveyTypeID
                    orderby sq.Order
                    select q;

    foreach( var question in questions ) {
        // ERROR: Null Reference Exception
        Console.WriteLine(&quot;Question Type: &quot; + question.QuestionType.Description);
    }
      
I am getting a null reference exception when I access the QuestionType property. I am using Include(&quot;QuestionType&quot;) but it doesn&#39;t appear to be working. What am I doing wrong?

**Edit**: It does not throw a null reference exception when I have Lazy Loading turned on.

**Edit**: Include() seems to be working when i do the following:

    var questions = db.Questions.Include(&quot;QuestionType&quot;).Select(q =&gt; q);

When I predicate on a separate entity Include seems to fail. Is that not allowed when using Include? What about my query is causing this thing to not work?

Entity Framework Include() is not working

I have a UIView that is placed as a subview in a UIScrollView. I have several child views made up of images, text, and buttons in the UIView. In order to get decent scrolling performance I set `shouldRasterize = YES` on the layer in the UIView. This worked great in that performance increased so I have smooth scrolling and doesn&#39;t pose an issue since my graphics are static once drawn. However, the problem is that when I set shouldRasterize that the rasterized graphics are blurry and low resolution on a Retina display. Is there a way to have high resolution graphics that are rasterized for performance?

Performance scrolling and retina resolution images in CALayer

<p>I have a UIView that is placed as a subview in a UIScrollView. I have several child views made up of images, text, and buttons in the UIView. In order to get decent scrolling performance I set <code>shouldRasterize = YES</code> on the layer in the UIView. This worked great in that performance increased so I have smooth scrolling and doesn't pose an issue since my graphics are static once drawn. However, the problem is that when I set shouldRasterize that the rasterized graphics are blurry and low resolution on a Retina display. Is there a way to have high resolution graphics that are rasterized for performance?</p>


Is there a way to use the keyboard with &quot;Go&quot; key instead of the &quot;Return&quot; key like when you are accessing login fields in Safari? I&#39;m guessing this should be something trivial but my searches aren&#39;t turning up anything. :(

Thanks in advance.

iOS keyboard with &quot;Go&quot; button instead of return

Is there anything similar to the `viewDidLoad` of `UIViewController` for a `UIView`???
I need to be notified as soon as a `UIView` has loaded (Subclass of `UIView`), and perform some actions.

UIView - How to get notified when the view is loaded?

What&#39;s the usual way to store c-structures in an `NSArray`? Advantages, disadvantages, memory handling?

Notably, what&#39;s the difference between `valueWithBytes` and `valueWithPointer`  -- raised by justin and catfish below.

[Here&#39;s a link][1] to Apple&#39;s discussion of `valueWithBytes:objCType:` for future readers...

For some lateral thinking and looking more at performance, Evgen has raised the issue of using `STL::vector` in **C++**.

*(That raises an interesting issue: is there a fast c library, not unlike `STL::vector` but much much lighter, that allows for the minimal &quot;tidy handling of arrays&quot; ...?)*

So the original question...

For example:

    typedef struct _Megapoint {
    	float	w,x,y,z;
    } Megapoint;

So: what&#39;s the normal, best, idiomatic way to store one&#39;s own structure like that in an `NSArray`, and how do you handle memory in that idiom?

Please note that I am specifically looking for the usual idiom to store structs.  Of course, one could avoid the issue by making a new little class. However I want to know how the usual idiom for actually putting structs in an array, thanks.

BTW here&#39;s the NSData approach which is perhaps? not best...

    Megapoint p;
    NSArray *a = [NSArray arrayWithObjects:
    	[NSData dataWithBytes:&amp;p length:sizeof(Megapoint)],
    	[NSData dataWithBytes:&amp;p length:sizeof(Megapoint)],
    	[NSData dataWithBytes:&amp;p length:sizeof(Megapoint)],
    		nil];

BTW as a point of reference and thanks to Jarret Hardie, here&#39;s how to store `CGPoints` and similar in an `NSArray`:

    NSArray *points = [NSArray arrayWithObjects:
    		[NSValue valueWithCGPoint:CGPointMake(6.9, 6.9)],
    		[NSValue valueWithCGPoint:CGPointMake(6.9, 6.9)],
    		nil];

(see https://stackoverflow.com/questions/899600/how-can-i-add-cgpoint-objects-to-an-nsarray-the-easy-way)

  [1]: http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/NumbersandValues/Articles/Values.html#//apple_ref/doc/uid/20000174-BAJJHDEG

What&#39;s the best way to put a c-struct in an NSArray?

What is the difference between iPhone Simulator and Android emulator? I have heard  people saying that Emulator really emulates the target device which is not true in case of simulator.

I think Android emulator mimics the processing speed of the target device, the memory usage, but a simulator does not emulate the device.

Difference between iPhone Simulator and Android Emulator

I would like to place an icon left of the two lines of text such that there&#39;s about 2-3 pixels of space between the image and the start of text. The control itself is Center aligned horizontally (set through Interface Builder)

The button would resemble something like this:

    |                  |
    |[Image] Add To    |
    |        Favorites |

I&#39;m trying to configure this with contentEdgeInset, imageEdgeInsets and titleEdgeInsets to no avail. I understand that a negative value expands the edge while a positive value shrinks it to move it closer to the center.

I tried:

    [button setTitleEdgeInsets:UIEdgeInsetsMake(0, -image.size.width, 0, 0)];
    [button setImageEdgeInsets:UIEdgeInsetsMake(0, button.titleLabel.bounds.size.width, 0, 0)];

but this doesn&#39;t display it correctly. I&#39;ve been tweaking the values but going from say -5 to -10 on the left inset value doesn&#39;t appear to move it in expected manner. -10 will scoot the text all the way to the left so I expected -5 to scoot it half way from the left side but it doesn&#39;t. 

What&#39;s the logic behind insets? I&#39;m not familiar with image placements and related terminology.

I used this SO question as a reference but something about my values isn&#39;t right.
https://stackoverflow.com/questions/2451223/uibutton-how-to-center-an-image-and-a-text-using-imageedgeinsets-and-titleedgein



Aligning text and image on UIButton with imageEdgeInsets and titleEdgeInsets

I know that the NSDateformatter suite of functionality is a boon for mankind, but at the same time it is very confusing to me. I hope you can help me out.

Somewhere in my code, there is an int representing a month. So: 1 would be January, 2 February, etc.

In my user interface, I would like to display this integer as proper month name. Moreover, it should adhere to the locale of the device.

Thank you for your insights


In the mean time, I have done the following:


    int monthNumber = 11
    NSString * dateString = [NSString stringWithFormat: @&quot;%d&quot;, monthNumber];
    
    NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@&quot;MM&quot;];
    NSDate* myDate = [dateFormatter dateFromString:dateString];
    [dateFormatter release];
    	
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@&quot;MMMM&quot;];
    NSString *stringFromDate = [formatter stringFromDate:myDate];
    [formatter release];


is this the way to do it? It seems a bit wordy.






iOS: How to get a proper Month name from a number?

I&#39;m new to Objective C. I have basic knowledge in C, including the concept of pointers. I have two basic questions:

 1. Can someone explain the difference between assign,copy, and retain with some analogy?
 2. How do you handle a function which returns pointer variable, and how do you perform messaging through a return pointer?

Content Type	Original Author	Original Content on Stackoverflow
Question	Jamie Hamick	View Question on Stackoverflow
Solution 1 - Iphone	Jamie Hamick	View Answer on Stackoverflow
Solution 2 - Iphone	astrojams1	View Answer on Stackoverflow
Solution 3 - Iphone	Akash Kundu	View Answer on Stackoverflow

Performance scrolling and retina resolution images in CALayer

Iphone Problem Overview

Iphone Solutions

Solution 1 - Iphone

Solution 2 - Iphone

Solution 3 - Iphone

Entity Framework Include() is not working

Using fourier analysis for time series prediction

Attributions