大约有 23,000 项符合查询结果（耗时：0.0304秒） [XML]
Detect permission of camera in iOS
...
Check the AVAuthorizationStatus and handle the cases properly.
NSString *mediaType = AVMediaTypeVideo;
AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];
if(authStatus == AVAuthorizationStatusAuthorized) {
// do your logic
} else if(authStatus...
Xcode Find and replace in all project files
...d to press enter for XCode to actually search through to find the matching strings. Otherwise the Replace / Replace All buttons remained disabled.
– Tim Beaudet
Jun 14 '15 at 17:17
...
JavaScript: Object Rename Key
... convert an API response that was prefixing Country Names with unnecessary string. Turned Object into array of keys and mapped through each key with substring method and returned a new object with new key and value indexed by original key
– Akin Hwan
Feb 10 '18...
Rails Migration: Remove constraint
...way... I would use change_column like so
change_column :users, :address, :string, :null => true
Docs...
http://apidock.com/rails/ActiveRecord/ConnectionAdapters/SchemaStatements/change_column
share
|
...
How to compare two floating point numbers in Bash?
...are compared as numbers and fractional parts are intentionally compared as strings. Variables are split into integer and fractional parts using this method.
Won't compare floats with integers (without dot).
share
|...
How to check size of a file using Bash?
...
[ -n file.txt ] doesn't check its size, it checks that the string file.txt is non-zero length, so it will always succeed.
If you want to say "size is non-zero", you need [ -s file.txt ].
To get a file's size, you can use wc -c to get the size (file length) in bytes:
file=file.txt
...
Allowed memory size of 33554432 bytes exhausted (tried to allocate 43148176 bytes) in php
...gram in PHP in a way that consumes memory faster than you realise. Copying strings, arrays and objects instead of using references will do it, though PHP 5 is supposed to do this more automatically than in PHP 4. But dealing with your data set in entirety over several steps is also wasteful compared...
How to reload a page using JavaScript
...g for because I needed to reload my page with a slight change in the query string.
– Bernard Hymmen
Jul 1 '15 at 0:01
1
...
Correct Bash and shell script variable capitalization
...ing), and relatively few 'locals' (counters, iterators, partly-constructed strings, and temporaries)
share
|
How do I clone a generic list in C#?
...uplicate the items in the list? Would this work? || var clonedList = ListOfStrings.ConvertAll(p => p);
– IbrarMumtaz
Aug 17 '14 at 15:42
...