FrameObserver

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A framework which helps you attach observers to `UIView`s to get updates on its frame changes

// repository documentation

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FrameObserver is a framework that lets you attach observers to any `UIView` subclass and get notified when its size changes. It doesn't use any Method Swizzling or KVO so it'll be perfectly safe to use. It is especially useful when dealing with entities that require you to supply a `CGRect` to them, e.g `CAGradientLayer`.

## Installation

###### CocoaPods

[CocoaPods](https://cocoapods.org) is a dependency manager for Cocoa projects. You can install it with the following command:
```
$ gem install cocoapods
```

Then, to add FrameObserver to your project, specify `FrameObserver` in your `Podfile`: 
```
source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '9.0'
use_frameworks!

target '<Your Target Name>' do
    pod 'FrameObserver'
end
```

## Usage

- Using closures:
```swift
view.addFrameObserver { frame, bounds in // get updates when the size of view changes
    print("frame", frame, "bounds", bounds)
}
```

- Using the delegate pattern:
```swift
class SomeViewController: UIViewController, FrameChangeDelegate {

func frameChangeDelegateDidChange(for view: UIView, _ frame: CGRect, _ bounds: CGRect) {
        if view == self.view {
            print("frame", frame, "bounds", bounds)
        }
    }

override func viewDidLoad() {
        super.viewDidLoad()
        view.addFrameObserver(with: self)
    }

}
```

You can call these on any `UIView` subclass, such as `UIButton`, `UIStackView`, etc.

The underlying implementation of this framework adds a totally invisibile, untappable view as a subview of the view you want to get notified about its frame. Thus, if you attach an observer to a `UIView` subclass, and for whatever reason remove all of its subviews, make sure you add the observer again.
```swift
override func viewDidLoad() {
    super.viewDidLoad()
    view.addFrameObserver(with: self)

for subview in view.subviews {
        subview.removeFromSuperview()
    }

// the observer no longer exists, recreating it again
    view.addFrameObserver(with: self)
}

```

## Other functions: 
- `func removeFrameObserver()`: Removes the current observer, if any. There's no need to call this in the `deinit` of your classes.
- `func hasFrameObserver() -> Bool`: Returns true if the view has a frame observer.

## License
FrameObserver is released under the MIT license. Check the LICENSE file for more details.

FrameObserver

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