KISObserver 1.1.0

KISObserver 1.1.0

LangLanguage Obj-CObjective C
License MIT
ReleasedLast Release Dec 2014

Maintained by Unclaimed.

  • By
  • Romain Lofaso

KISObserver is an easy way to use the Key-Value Observing (KVO) pattern.

You can observe objects for keypaths with blocks, selectors and the usual API. Moreover, the observer removes automagically the observations when it is deallocated.

How to use it

An observation with a block and the default options:

[self observeObject:ob forKeyPaths:@"property" withBlock:^(KISNotification *notification) {
    NSLog(@"New value:\t%@", notification.newValue);
    NSLog(@"Old value:\t%@", notification.oldValue);

An observation with a selector on a one-to-many relation:

NSKeyValueObservingOptions opt = NSKeyValueObservingOptionInitial | NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld;
[self observeObject:ob forKeyPaths:@"arr" options:opt withSelector:@selector(onChangeWithNotification:)];

// ...

- (void)onChangeWithNotification:(KISNotification *)notification
    NSLog(@"isSetting:\t%hhd", notification.isSetting);
    NSLog(@"Insertions:\t%@", notification.insertionIndexSet);
    NSLog(@"Removals:\t%@", notification.removalIndexSet);
    NSLog(@"Replacements:\t%@", notification.replacementIndexSet);

An observation of many keypaths at the same time:

[self observeObject:ob forKeyPaths:@"prop1|prop2" withBlock:^(KISNotification *notification) {
    NSLog(@"KeyPath:\t%@", notification.keyPath);
    NSLog(@"New value:\t%@", notification.newValue);
    NSLog(@"Old value:\t%@", notification.oldValue);

Your dealloc:

- (void)dealloc
    // Nothing to do. :-)

How to install it

Use CocoaPods!

CocoaPods is a dependency manager for Objective-C, which automates and simplifies the process of using 3rd-party libraries in your projects.

  1. Add the project inside your Podfile

    pod 'KISObserver', '~> 1.0.x'
  2. Update your installation

    pod install
  3. Import KISObserver within the files that are going to use it

    #import <KISObserver/KISObserver.h>


KISObserver is available under the MIT license. See the LICENSE file for more info.