A swift library for implementing state machine just like GKStateMachine in GameplayKit.
classBoxColorState:DBState{varboxView:UIView?varlogTextView:UITextView?init(boxView:UIView?, logTextView:UITextView?){self.boxView = boxView
self.logTextView = logTextView
super.init()}}classGrayState:BoxColorState{overridefunc isValidNextState(stateClass:AnyClass)->Bool{return stateClass ==RedState.self || stateClass ==GreenState.self
}overridefunc didEnterWithPreviousState(previousState:DBState?){self.boxView?.backgroundColor =UIColor.grayColor()UIView.animateWithDuration(3.5){self.boxView?.layer.opacity =0.2}self.logTextView?.text.appendContentsOf("\ngray state did enter...")}overridefunc willExitWithNextState(nextState:DBState){UIView.animateWithDuration(0.5){self.boxView?.layer.opacity =1.0}self.logTextView?.text.appendContentsOf("\ngray state will exit...")}}classRedState:BoxColorState{overridefunc isValidNextState(stateClass:AnyClass)->Bool{return stateClass ==GreenState.self
}overridefunc didEnterWithPreviousState(previousState:DBState?){self.boxView?.backgroundColor =UIColor.redColor()UIView.animateWithDuration(0.5){self.boxView?.transform =CGAffineTransformScale(CGAffineTransformIdentity,1.2,1.2)}self.logTextView?.text.appendContentsOf("\nred state did enter...")}overridefunc willExitWithNextState(nextState:DBState){UIView.animateWithDuration(0.5){self.boxView?.transform =CGAffineTransformScale(CGAffineTransformIdentity,1.0,1.0)}self.logTextView?.text.appendContentsOf("\nred state will exit...")}}classGreenState:BoxColorState{overridefunc isValidNextState(stateClass:AnyClass)->Bool{return stateClass ==BlueState.self
}overridefunc didEnterWithPreviousState(previousState:DBState?){self.boxView?.backgroundColor =UIColor.greenColor()UIView.animateWithDuration(0.5){self.boxView?.transform =CGAffineTransformRotate(CGAffineTransformIdentity,2.5)}self.logTextView?.text.appendContentsOf("\ngreen state did enter...")}overridefunc willExitWithNextState(nextState:DBState){UIView.animateWithDuration(0.5){self.boxView?.transform =CGAffineTransformRotate(CGAffineTransformIdentity,0)}self.logTextView?.text.appendContentsOf("\ngreen state will exit...")}}classBlueState:BoxColorState{overridefunc isValidNextState(stateClass:AnyClass)->Bool{return stateClass ==BlackState.self
}overridefunc didEnterWithPreviousState(previousState:DBState?){self.boxView?.backgroundColor =UIColor.blueColor()UIView.animateWithDuration(0.5){self.boxView?.transform =CGAffineTransformScale(CGAffineTransformIdentity,0.1,0.1)}self.logTextView?.text.appendContentsOf("\nblue state did enter...")}overridefunc willExitWithNextState(nextState:DBState){UIView.animateWithDuration(0.5){self.boxView?.transform =CGAffineTransformScale(CGAffineTransformIdentity,1,1)}self.logTextView?.text.appendContentsOf("\nblue state will exit...")}}classBlackState:BoxColorState{overridefunc isValidNextState(stateClass:AnyClass)->Bool{return stateClass ==GrayState.self
}overridefunc didEnterWithPreviousState(previousState:DBState?){self.boxView?.backgroundColor =UIColor.blackColor()self.boxView?.layer.cornerRadius =20self.logTextView?.text.appendContentsOf("\nblack state did enter...")}overridefunc willExitWithNextState(nextState:DBState){self.boxView?.layer.cornerRadius =0self.logTextView?.text.appendContentsOf("\nblack state will exit...")}}
···
letgrayState=GrayState(boxView: boxView, logTextView: logTextView)letredState=RedState(boxView: boxView, logTextView: logTextView)letgreenState=GreenState(boxView: boxView, logTextView: logTextView)letblueState=BlueState(boxView: boxView, logTextView: logTextView)letblackState=BlackState(boxView: boxView, logTextView: logTextView)
stateMachine =DBStateMachine(states:[grayState, redState, greenState, blueState, blackState])
stateMachine.enterState(GrayState)
···GKStateMachine only can be used iOS9+, but I want perfect downward compatible. Just use it directly as if it's shipped from iOS7.
- iOS7+
- Swift
A DBStateMachine object manages a finite-state machine - a collection of states that has at all times a single current state, a means for transitioning from the current state to another in the collection, and a set of rules that determines which transitions between states are valid.
To build a state machine, first define a distinct subclass of DBState for each possible state of the machine. In each state class, the isValidNextState: method determines which other state classes the machine may transition into from that state.Then, create a state machine object by constructing instances of the state classes and passing them to initializer. Finally, set the machine in motion by choosing an initial state for it to enter with the enterState: method.
To define state-dependent behavior, override the didEnterWithPreviousState:, and willExitWithNextState: methods in each DBState subclass.
Please let me know if you like the library, or have any suggestions:]. I plan to maintain this library regularly. Any pull requests are welcome!
- Email: dabing1022@gmail.com
DBStateMachine is available under the MIT license. See the LICENSE file for more info.