文件列表:

.swift-version (4, 2017-12-03)
.travis.yml (531, 2017-12-03)
Docs/ (0, 2017-12-03)
Docs/make-mixins.md (1778, 2017-12-03)
Docs/use-mixins.md (1709, 2017-12-03)
Example/ (0, 2017-12-03)
Example/Mixin.xcodeproj/ (0, 2017-12-03)
Example/Mixin.xcodeproj/project.pbxproj (26100, 2017-12-03)
Example/Mixin.xcodeproj/project.xcworkspace/ (0, 2017-12-03)
Example/Mixin.xcodeproj/project.xcworkspace/contents.xcworkspacedata (150, 2017-12-03)
Example/Mixin.xcodeproj/xcshareddata/ (0, 2017-12-03)
Example/Mixin.xcodeproj/xcshareddata/xcschemes/ (0, 2017-12-03)
Example/Mixin.xcodeproj/xcshareddata/xcschemes/Mixin-Example.xcscheme (4390, 2017-12-03)
Example/Mixin.xcworkspace/ (0, 2017-12-03)
Example/Mixin.xcworkspace/contents.xcworkspacedata (223, 2017-12-03)
Example/Mixin/ (0, 2017-12-03)
Example/Mixin/AppDelegate.swift (2171, 2017-12-03)
Example/Mixin/Base.lproj/ (0, 2017-12-03)
Example/Mixin/Base.lproj/LaunchScreen.xib (3699, 2017-12-03)
Example/Mixin/Base.lproj/Main.storyboard (6321, 2017-12-03)
Example/Mixin/Images.xcassets/ (0, 2017-12-03)
Example/Mixin/Images.xcassets/AppIcon.appiconset/ (0, 2017-12-03)
Example/Mixin/Images.xcassets/AppIcon.appiconset/Contents.json (586, 2017-12-03)
Example/Mixin/Info.plist (1149, 2017-12-03)
Example/Mixin/SetupMixin.swift (1127, 2017-12-03)
Example/Mixin/ViewController.swift (2805, 2017-12-03)
Example/Podfile (193, 2017-12-03)
Example/Podfile.lock (431, 2017-12-03)
Example/Pods/ (0, 2017-12-03)
Example/Pods/Local Podspecs/ (0, 2017-12-03)
Example/Pods/Local Podspecs/Mixin.podspec.json (503, 2017-12-03)
Example/Pods/Manifest.lock (431, 2017-12-03)
Example/Pods/Nimble/ (0, 2017-12-03)
Example/Pods/Nimble/LICENSE (11307, 2017-12-03)
Example/Pods/Nimble/Sources/ (0, 2017-12-03)
Example/Pods/Nimble/Sources/Lib/ (0, 2017-12-03)
Example/Pods/Nimble/Sources/Lib/CwlPreconditionTesting/ (0, 2017-12-03)
Example/Pods/Nimble/Sources/Lib/CwlPreconditionTesting/CwlCatchException/ (0, 2017-12-03)
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# Mixin [](http://cocoapods.org/pods/Mixin) [](http://cocoapods.org/pods/Mixin) [](http://cocoapods.org/pods/Mixin) # Why? Swift is Protocol-Oriented Programming, and it's more powerful by default implementations of extensions of protocols. You can mixin methods to classes like Ruby's Mixin. However, iOS as a UI framework, objects like UIViewController have their own life cyle, if you can't listen life cyle methods, extensions as mixin don't really help. For example, I write a protocol with extension to listen keyboard events ```swift protocol KeyboardMixin { var keyboardHeight: CGFloat? { set get } func registerKeyboard() func deregisterKeyboard() } extension KeyboardMixin { func registerKeyboard() { NotificationCenter.default.addObserver(forName: NSNotification.Name.UIKeyboardWillHide, object: nil, queue: nil) { [weak self] notification in self?.keyboardHeight = nil } NotificationCenter.default.addObserver(forName: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil, queue: nil) { [weak self] notification in if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue { self?.keyboardHeight = keyboardSize.height } } } func deregisterKeyboard() { NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: nil) NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil) } } ``` But I still need to register and deregister by myself ```swift class ViewController: UIViewController, KeyboardMixin { var keyboardHeight: CGFloat? { didSet { } } override func viewWillAppear(_ animated: Bool) { registerKeyboard() } override func viewWillDisappear(_ animated: Bool) { deregisterKeyboard() } } ``` The problem is why can't I mixin something to existing methods e.g. UIViewController life cyle? If you have programmed React.js, you'll find its Mixin mechanism is very useful. So I just copy the idea to iOS. After using this package, you can write a mixin like this. ```swift public protocol KeyboardMixin: ViewControllerMixinable { var keyboardHeight: CGFloat? { set get } } public extension KeyboardMixin { private func registerKeyboard() { NotificationCenter.default.addObserver(forName: NSNotification.Name.UIKeyboardWillHide, object: nil, queue: nil) { [weak self] notification in self?.keyboardHeight = nil } NotificationCenter.default.addObserver(forName: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil, queue: nil) { [weak self] notification in if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue { self?.keyboardHeight = keyboardSize.height } } } private func deregisterKeyboard() { NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: nil) NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil) } fileprivate func viewWillAppear(_ animated: Bool) { registerKeyboard() } fileprivate func viewWillDisappear(_ animated: Bool) { deregisterKeyboard() } } ``` And use it like below ```swift class ViewController: UIViewController, KeyboardMixin { var keyboardHeight: CGFloat? { didSet { } } override func viewWillAppear(_ animated: Bool) { // Don't worry, you can still do things here... } } ``` It can't be simpler! ## How it works This package uses iOS runtime to swizzle methods, so all override methods and mixins' methods will be called simultaneously. ## Support This package support mixin to * [UIViewControllerLifeCycle](https://github.com/oney/Mixin/blob/master/Mixin/Classes/Mixinables/ViewControllerMixinable.swift#L11) * [ExtendTableViewDelegate](https://github.com/oney/Mixin/blob/master/Mixin/Classes/Mixinables/TableViewMixinable.swift#L11) * UIScrollViewDelegate * UITextFieldDelegate ## Example Check out [Example ViewController](https://github.com/oney/Mixin/blob/master/Example/Mixin/ViewController.swift), it shows how amazing to use Mixin * [How to use mixins](https://github.com/oney/Mixin/tree/master/Docs/use-mixins.md) * [How to make mixins](https://github.com/oney/Mixin/tree/master/Docs/make-mixins.md) ## Requirements Only tested in Swift 4 ## Installation Mixin is available through [CocoaPods](http://cocoapods.org). To install it, simply add the following line to your Podfile: ```ruby pod 'Mixin' ``` ## Author Howard Yang, appdevoney@gmail.com ## License Mixin is available under the MIT license. See the LICENSE file for more info.

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