DogSwift

A lightweight and easy to use logging API to include in your mobile iOS application.

DogSwift uses os_log on devices with iOS 10.0+ installed and falls back to NSLog for older iOS versions. DogSwift can print errors, messages and object descriptions to Xcode's debugging console. It's also possible to tag each logging statement with a category which will be utilized by Apple's os_log implementation, like UI, Networking et cetera.

Instructions

Add the environment variable LOG_LEVEL along with the desired value:

• error = 1
• warn = 2
• info = 3
• debug = 4

Log to Xcode's debugging console

// Log function name of current scope.
Log.info(#function)

// The message parameter can be of type `Any`.
Log.debug(view.bounds, tag: .ui)

// Log a warning.
Log.warn("Current device is running iOS 9.0, which doesn't support os_log.", tag: .location)

// Error logging.
let exampleError = NSError(domain: "ch.dreipol", code: -9999, userInfo: [
    NSLocalizedDescriptionKey: "Flying to the moon was not possible.",
    NSLocalizedFailureReasonErrorKey: "The operation timed out.",
    NSLocalizedRecoverySuggestionErrorKey: "Have you tried turning it off and on again?"
])
Log.error(exampleError, description: #function, tag: .system

Logging with tags

Tags can help to group the logging output. Currently the folliwing tags are supported:

• none
• database
• networking
• system
• ui

Define custom tags

It's possible to define your own tags and pass them to DogSwift:

import DogSwift

enum ExampleTag: String {
    case viewDidLoad
}

extension ExampleTag: TagProtocol {
    func makeString() -> String {
        return String(describing: self)
    }
}

The new Tag can now be passed to DogSwift:

[...]

override func viewDidLoad() {
    super.viewDidLoad()

    Log.debug(view.bounds, tag: ExampleTag.viewDidLoad)
}
    
[...]

Requirements

Swift 5.0

Installation with CocoaPods

DogSwift is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'DogSwift'

DogSwiftExample

To run the example project, open DogSwiftExample.xcworkspace which resides inside the DogSwiftExample directory. The demo app contains some examples on how to use DogSwift for Logging errors as well as various information to Xcode's debugging console.