Jay Versluis Say you had the URL to a file on the web and you’d like to save said file in the app’s Documents directory. I thought it would be as simple as using the NSFilemanager and copying the URL. But it’s a little more complex than that. Instead, we can use NSData to retrieve the data […]
We can use NSData’s length method for this. Imagine your UIImage is yourImage: NSData *imageData = UIImageJPEGRepresentation(yourImage, 1); NSLog(@”Size of your image is %d bytes”, [imageData length]) [imageData length] returns a double in bytes, which will be the size of your image. This is useful if you’d like to save something and you’re limited in […]
You can query the NSFoundationVersionNumber like so: if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1) { // you’re running iOS 6.1 or earlier } else { // you’re running iOS 7 or later } Note that if you’re compiling with an older SDK, the value you’re querying may not be defined – in which case, you must define it […]
Before the addition of 64bit in iOS it was possible to take an NSUInteger (or NSInteger) and put it into an int variable, like so: int arrayCount = [self.myArray count]; If you add 64bit support to your app you may notice a compiler warning when you do this: Implicit conversion loses integer precision: ‘NSInteger’ (aka […]
Since iOS 7 and OS X 10.9 the default journalling mode in SQLite Stores is WAL. In addition to the main store file you’ll find a WAL file with the same (or larger) size as the store file, and a less important SHM file. Prior to this implementation it was easy to save the context, […]
When you want to display graphics that reside inside your own plugin directory you can serve those via a handy built-in WordPress function called plugins_url. It works just like its counterpart get_stylesheet_directory_uri does in themes. For example, if you’d like to link to a file that resides at http://yourdomain.com/wp-content/plugins/your-plugin/images/your-graphic.png then you can write this URL … Read more
When you’re displaying graphics that are served from your own theme directory, hard coding is never a good idea. In fact it’s impossible because you don’t know your user’s URL. There are a couple of built-in WordPress functions that can help us here. One of them is called get_stylesheet_directory_uri which returns the URL to your … Read more
Sometimes Xcode gets confused with the intricacies of versioning. Frequently I find that I’m on a branch, everything is working fine, and for the life of me can’t merge it back into the Master branch. Often this happens because Xcode refuses NOT to make an change, such as update certain files I have already dealt […]