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Wouldn't it be great if we could adjust feeds and configurations of our native apps without having to sit back to Xcode, change code, recompile and navigate back to screen we were at?

One of the basis of building tools that allow us to do just that is the way we observe for data changes, this micro-framework provides you File observers for Local and Remote assets.

This framework provides:

  • FileWatcher.Local useful for observing local file changes, it can also be used to breach Sandbox env for debug simulator builds and e.g. observe file on the developer desktop (like the demo app does).

  • FileWatcher.Remote can be used to observe files on the web, it supports both Etag headers and Last-Modified-Date so you can just put file on Dropbox or real ftp server.

It also supports usage from Objective-C projects. For this, you should consider these following steps:

  1. Add $(TOOLCHAIN_DIR)/usr/lib/swift/$(PLATFORM_NAME) into your projects Library Search Paths in Build Setting section.

  2. Import swift-header by adding @import KZFileWatchers; into any .m file, where you want to use FileWatchers.

  3. Use provided classes for set up file observing like this:

self.fileWatcher = [[LocalFileWatcher alloc] initWithPath:path];
self.fileWatcher.delegate = self;
[self.fileWatcher startWithError:nil];
  1. Implement FileWatcherDelegate in your class for handling file refreshing events. For example:
- (void)refreshDidOccurFrom:(id<FileWatcherProtocol>)fileWatcher type:(enum RefreshResult)type data:(NSData *)data
    self.textLabel.text = [[NSString alloc] initWithData:data encoding:kCFStringEncodingUTF8];


KZFileWatchers is available through CocoaPods and Swift Package Manager.


In order to install KZFileWatchers by using CocoaPods, simply add the following line to your Podfile:

pod "KZFileWatchers"

Last version to support Swift 2.3 is 0.1.2
Last version to support Swift 3.0 is 1.0.4

Swift Package Manager

Installing KZFileWatchers over SwiftPM is only supported since version 1.0.1. You just need to add it as a dependency to your Package.swift manifest:

import PackageDescription

let package = Package(
    name: "YourProject",
    dependencies: [
        .package(url: "", from: "1.1.0"),
        // other dependencies
    targets: [
        .executableTarget(name: "YourApp", dependencies: [
            .product(name: "KZFileWatchers", package: "KZFileWatchers"),
            // other dependencies


Krzysztof ZabÅ‚ocki, [email protected]


Contributions to KZFileWatchers are welcomed and encouraged! Please see the Contributing guide.

A list of contributors is available through GitHub.

To give clarity of what is expected of our members, KZFileWatchers has adopted the code of conduct defined by the Contributor Covenant. This document is used across many open source communities. For more, see the Code of Conduct.


KZFileWatchers is available under the MIT license. See LICENSE for more information.