NBPoliteObserver

A simple light weight "polite" KVO observer that removes itself automatically when observed object deallocates... instead of rudely crashing

Requirements

• iOS 8.1+

Example App

To run the example project, clone the repo, and run

Installation

CocoaPods

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

pod "NBPoliteObserver"

Manual

Add the following files to your project

NBPoliteObserverObject.h
NBPoliteObserverObject.m
NSObject+NBPolite.h
NSObject+NBPolite.m

Usage

Import NSObject+NBPolite.h to your class (or bridging-header if its a swift project)

#import <NBPoliteObserver/NSObject+NBPolite.h>

Add Observer

Use exactly as you would use Foundation KVO, just call addPoliteObserver instead of addObserver

    var object:NSObject? = NSObject()
    object!.addPoliteObserver(self, forKeyPath: "keyPath", options: [], context: nil)
    object = nil // Try this. It will NOT cause a crash

Manually Remove Observer (Optional)

The polite observer will remove itself automatically when (before) the observed object is deallocated... so this is completely optional. Use exactly as you would use Foundation KVO, just call removePoliteObserver instead of removeObserver

    object!.removePoliteObserver(self, forKeyPath: "keyPath")

Collaboration

Feel free to collaborate with ideas, issues and/or pull requests.

Author

Noam Bar-on

License

The MIT License (MIT)

Copyright (c) 2016 Noam Bar-on.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.