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Refactoring

Refactoring. Moving a console app to a UI app. Refactoring. Goal: change a console app to a UI app Principles: The main.m goes away The local variables in the main.m file become instance variables in the new viewController.m

roddy
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Refactoring

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  1. Refactoring Moving a console app to a UI app

  2. Refactoring • Goal: change a console app to a UI app • Principles: • The main.m goes away • The local variables in the main.m file become instance variables in the new viewController.m • The functions that implemented console interactions with the user become IBAction methods for various UI components • Other classes in the console app are imported as are to the UI app For the code for these slides, see the class web site, References->Examples->AlienRefactored

  3. Creating the project • Create new single view project • I named mine “alienRefactored” • You get the appDelegate and the ViewController.m • Now import the class files (but not the main.m file) from the old project • FileAdd Files to “AlienRefactored” • See next slide for the dialog box

  4. Creating the project Choose the files Check this box

  5. Main.m • Does not exist in the new project (that we can see) • Open main.m from the old project. • Use code • If there were local variables, make them instance variables • See next slide

  6. XXXViewController.h #import <UIKit/UIKit.h> #import "alien.h” static const int NUMALIENS = 2; @interface CMPViewController :UIViewController{ alien *george, *sally; double timeToHome; double timeToPlace; double theSpeed; double theDistance; id theAliens[5];} @end Import any class you use Make constants that you need. These must be static

  7. XXXViewController.h • (void) viewDidLoad{ [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. nextIndex = 0; } Use viewDidLoad method to initialize variables and initialize any dynamic memory.

  8. Designing the interface • See where the console app asked for input printf(“enter alien name:”); scanf(“%s”, theName); printf(“enter number of eyes:”); scanf(“%d”, numEyes); printf(“enter distance to home:”); scanf(“%f”, theDistance); printf(“enter speed of ship:”); scanf(“%f”, theSpeed); These become UITextFields You’ll need IBOutlets to access them in your code. You’ll also need a button to determine when to add this alien

  9. Interface

  10. Connections Create IBOutlets for the fields Create IBAction for the button

  11. IBActions • Fill in the action methods −(IBAction)addAlien:(UIButton *)sender { NSString *thePlanet = _nameField.text; theSpeed = [_speedField.textdoubleValue]; theDistance = [_distanceField.textdoubleValue]; intnumEyes = [_numEyesField.textintegerValue]; george =[[alien alloc] initWithNum: numEyesandDistance: theDistanceandPlanet: thePlanet]; if (nextIndex < 5) { theAliens[nextIndex++] = george; NSLog(@"the next alien lives at %@ and is %f miles from home at %f speed", ((alien *)theAliens[nextIndex - 1]).planet, ((alien *)theAliens[nextIndex - 1]).distanceToHome, ((alien *)theAliens[nextIndex - 1]).speedSpaceShip); } } If you don’t explicitly @synthesis properties, their getters and setters are preceded by an underscore (‘_’) Print to the console as an error check

  12. Fix the keyboard Connect to this method from every text field

  13. Fix the keyboard • Add the action method for the text fields • −(IBAction)didFinishEditing:(UITextField *)sender { • [sender resignFirstResponder]; • }

  14. Put in appropriate error messages • Array is full in - (IBAction)addAlien:(UIButton *)sender if (nextIndex < MAXALIENS) { // previous code else{ // the array is full UIAlertView *alert = [[UIAlertViewalloc] initWithTitle:@"Alien Alert!" message:@"Too many Aliens!" delegate:nilcancelButtonTitle:@"Phew!" otherButtonTitles:nil]; [alert show]; }

  15. Add more buttons • Each console option must have a component (usually a button). • Add more buttons and fields as necessary. • Hide components to minimize clutter

  16. More Buttons Add components to perform other functions from the console app

  17. Connect the new components I would also add an IBOutlet for the new field.

  18. Add bodies for the Action methods • For our “Calc Time” button • (IBAction)calcTimeHome:(UIButton *)sender { // pick an arbitrary alien if (nextIndex > 0){ float timeHome = [((alien *)theAliens[0]) calcTimeToHome]; // put the value into the text field _timeToHome.text = [NSStringstringWithFormat: @"%f", timeHome]; } } If you don’t explicitly @synthesis properties, their getters and setters are preceded by an underscore (‘_’)

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