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What are the best practices for using a GUID as a primary key, specifically regarding performance?
I have an application that uses GUID as the Primary Key in almost all tables and I have read that there are issues about performance when using GUID as Primary Key. Honestly, I haven't seen any problem, but I'm about to start a new application and I still want to use the GUIDs as the Primary Keys, b...
getting the screen density programmatically in android?
...ources().getDisplayMetrics();
Though Android doesn't use a direct pixel mapping, it uses a handful of quantized Density Independent Pixel values then scales to the actual screen size. So the metrics.densityDpi property will be one of the DENSITY_xxx constants (120, 160, 213, 240, 320, 480 or 640 d...
Android: remove notification from notification bar
I have created an application and with an event I manage to add notification in android notification bar. Now I need sample how to remove that notification from notification bar on an event ??
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Xcode 4 - build output directory
...DerivedData/ folder, simple enough. Except that the subfolders seem to be AppName-asdflkjqwergoobledygook. Since I'm building from a script, I'd like to actually find the build (so I can package it and send via TestFlight :) How do I determine which of the many MyAppName-xxxx-s is the right one? ...
Warning :-Presenting view controllers on detached view controllers is discouraged
In my app, I am using a navigation controller. Later on in some view I am using presentViewController for showing a zoomed image.
Also I am not using a Storyboard or nib.
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kill -3 to get java thread dump
... It's worth noting that jstack requires the JDK. If you're running apps on a server that only has the JRE installed, you'll need to find another means for thread dumping.
– jeffkempf
Nov 27 '17 at 15:30
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Does C# have an equivalent to JavaScript's encodeURIComponent()?
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I should've been more specific: This is for a windows app, the only items available in System.Web are: AspNetHostingPermission, AspNetHostingPermissionAttribute, and AspNetHostingPermissionLevel.
– travis
Sep 17 '08 at 19:15
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Any good, visual HTML5 Editor or IDE? [closed]
...>, the sessionStorage and localStorage etc object autocompletion do not appear...
– Lee Chee Kiam
Mar 15 '12 at 9:09
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How can I load storyboard programmatically from class?
... way to work both with xib and storyboard without huge refactoring, I will appreciate for any help.
8 Answers
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Cocoa Core Data efficient way to count entities
... the total number of instances of an entity in Core Data:
let context = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
let fetchRequest = NSFetchRequest(entityName: "MyEntity")
let count = context.countForFetchRequest(fetchRequest, error: nil)
I tested this in the...