Here is an extension you can use in your Swift (v4) projects that makes it easy to parse parameters from a url. Given a url like, "http://example.com/?x=1&y=2", you can extract the x and y parameters into a key, value data structure. Here is the s...

You have to subclass NSObject class Car : NSObject { func drive(){ print("Driving..") } } let car : Car = Car() car.perform(NSSelectorFromString("drive"))

Is your app connected to the internet? You can use this standalone class to check! There are no dependencies so you can copy/paste it into your project without needing to install another framework. With this class it's as simple as running `Reachabili...

If you're working with an XCode application, either iOS or MacOS, and want to do a completely clean build and delete the cache, it's simple. Execute this command from the command line.. defaults delete your.apps.bundle.id Where "your.apps.bundl...

You can add this snippet to your application, say for instance in your `viewDidLoad` function, that will print to the XCode console, the location of your app while it's being developed. // prints the location of asset my-added-file.txt that you've ad...

I just got a new machine and downloaded XCode. I used git to clone my ReactNative project from Github. I have everything ready to go. But when I run `react-native run-ios` I see xcrun: error: unable to find utility "instruments", not a developer tool ...

I am not using the full Xcode package on my laptop. Instead I'm using the command line tools, offered by Apple as a separate and much smaller install. I haven't had too many issues, aside from not being able to use the FileMerge program that ships with ...