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What exactly does @synthesize do?
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In your example, mapView1 is an instance variable (ivar), a piece of memory storage that belongs to an instance of the class defined in example.h and example.m. mapView is the name of a property. Properties are attributes of an object t...
Set NOW() as Default Value for datetime datatype?
I have two columns in table users namely registerDate and lastVisitDate which consist of datetime data type. I would like to do the following.
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Handling applicationDidBecomeActive - “How can a view controller respond to the app becoming Active?
I have the UIApplicationDelegate protocol in my main AppDelegate.m class, with the applicationDidBecomeActive method defined.
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Android emulator and virtualbox cannot run at same time
Whenever I have Virtualbox running, I cannot start an Android emulator image (and vice versa). The error message in the AVD manager is
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Akka or Reactor [closed]
I am in the process of starting a new project (java-based). I need to build it as a modular, distributed and resilient architecture.
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Emacs - Multiple columns one buffer
I'm trying to edit some assembly code which tends to be formatted in long but thin listings. I'd like to be able to use some of the acres of horizontal space I have and see more code on-screen at one time. Is there a method for getting Emacs (or indeed another editor) to show me multiple columns a...
Remove all classes that begin with a certain string
I have a div with id="a" that may have any number of classes attached to it, from several groups. Each group has a specific prefix. In the javascript, I don't know which class from the group is on the div. I want to be able to clear all classes with a given prefix and then add a new one. If I want...
How can I test what my readme.md file will look like before committing to github?
I am writing a readme for my github project in the .md format. Is there a way can I test what my readme.md file will look like before committing to github?
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How to change the color of a CheckBox?
...reen, and I want to change this color.
If it is not possible please tell me how to make a custom CheckBox ?
23 Answers
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In what cases will HTTP_REFERER be empty
I know it's possible to get an empty HTTP_REFERER. Under what circumstances does this happen? If I get an empty one, does it always mean that the user changed it? Is getting an empty one the same as getting a null one? and under what circumstances do I get that too?
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