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Save An Image To Application Documents Folder From UIView On IOS
...ly don't want to store these images in Core Data, since that can impact performance if the data set grows too large. Better to write the images to files.
NSData *pngData = UIImagePNGRepresentation(image);
This pulls out PNG data of the image you've captured. From here, you can write it to a file:...
Swift: declare an empty dictionary
... @Damir179 the first line is plain wrong. There's no type information there so you have to be explicit, otherwise you will produce an unusable instance of __NSDictionaryI. Try adding an element to that emptyDict and it will fail at compile time.
– Gabriele Petron...
Run an app on a multiple devices automatically in Android Studio
...
For new users, in Android Studio 2, you also need to disable "Instant Run" in Settings->Build, Execution, Deployment->Instant Run. See Instant Run.
With Instant Run, you only can work with one device at time.
UPDATE
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Generate a random alphanumeric string in Cocoa
...ableString *randomString = [NSMutableString stringWithCapacity: len];
for (int i=0; i<len; i++) {
[randomString appendFormat: @"%C", [letters characterAtIndex: arc4random_uniform([letters length])]];
}
return randomString;
}
...
How to format a number as percentage in R?
One of the things that used to perplex me as a newby to R was how to format a number as a percentage for printing.
10 Answe...
Undo git update-index --skip-worktree
...s that I've "hidden" with skip-worktree. Hoped to make an alias "hidden" for that command, but putting a pipe redirection in the alias did not seem to work.
– amacleod
Feb 5 '14 at 19:36
...
“Content is not allowed in prolog” when parsing perfectly valid XML on GAE
I've been beating my head against this absolutely infuriating bug for the last 48 hours, so I thought I'd finally throw in the towel and try asking here before I throw my laptop out the window.
...
Efficient SQL test query or validation query that will work across all (or most) databases
...ection pooling libraries provide the ability to test their SQL connections for idleness. For example, the JDBC pooling library c3p0 has a property called preferredTestQuery , which gets executed on the connection at configured intervals. Similarly, Apache Commons DBCP has validationQuery .
...
How to remove/delete a large file from commit history in Git repository?
..., a simpler, faster alternative to git-filter-branch specifically designed for removing unwanted files from Git history.
Carefully follow the usage instructions, the core part is just this:
$ java -jar bfg.jar --strip-blobs-bigger-than 100M my-repo.git
Any files over 100MB in size (that aren't i...
How to get the next auto-increment id in mysql
...
You can use
SELECT AUTO_INCREMENT
FROM information_schema.tables
WHERE table_name = 'table_name'
AND table_schema = DATABASE( ) ;
or if you do not wish to use information_schema you can use this
SHOW TABLE STATUS LIKE 'table_name'
...