大约有 40,000 项符合查询结果（耗时：0.0574秒） [XML]
Objective-C: Where to remove observer for NSNotification?
...his is obviously not a satisfying answer.
I'd recommend, that you add a call [notificationCenter removeObserver: self] in method dealloc of those classes, which you intend to use as observers, as it is the last chance to unregister an observer cleanly. This will, however, only protect you against ...
How to display a content in two-column layout in LaTeX?
... By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy
...
How to use split?
... By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy
...
Show current key setting?
... By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy
...
Keyboard shortcuts with jQuery
...
Since this question was originally asked, John Resig (the primary author of jQuery) has forked and improved the js-hotkeys project. His version is available at:
http://github.com/jeresig/jquery.hotkeys
...
Python: How to create a unique file name?
...
I didn't think your question was very clear, but if all you need is a unique file name...
import uuid
unique_filename = str(uuid.uuid4())
share
|
improve this answer
...
How to generate a random int in C?
...
Note: Don't use rand() for security. If you need a cryptographically secure number, see this answer instead.
#include <time.h>
#include <stdlib.h>
srand(time(NULL)); // Initialization, should only be called once.
int r = rand(); // Returns a pseudo-random integer bet...
How to do math in a Django template?
... By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy
...
What does the double colon (::) mean in CSS?
... By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy
...
How do I get the type of a variable?
...
I totally disagree. Java, C#, PHP, Perl, Python and so on were designed in C and C++ and they are not caterpillars. (When you create an database application to open variable tables from 'unknown' databases you need to control fiel...