Diet View Controllers

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Transcript

1. Diet View Controllers
2. We need to talk...
4. MODEL VIEW CONTROLLERS
5. MASSIVE VIEW CONTROLLERS
6. MISUSED VIEW CONTROLLERS
7. MISTREATED VIEW CONTROLLERS
8. Um belo dia...
9. XCODE > NEW > PROJECT
10. Eu preciso de... UM dataSource PARA MINHA UITableView
11. Eu preciso de... UNS dados VINDOS DO servidor
12. Eu preciso de... ALGO PARA validar MEUS UITextFields
13. Eu preciso de... um CLLocationManagerDelegate
14. Eu preciso de... uma última coisinha BEM PEQUENA
16. THE 900-LINE PROBLEM
17. "Using #pragma mark is indicative of a failure to adhere to the Single Responsibility Principle and is a signpost for poor code." -- Brad Grzesiak, Bendyworks
19. 1. DATASOURCES E DELEGATES
20. - (NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section { return photos.count; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { PhotoCell *cell = [tableView dequeueReusableCellWithIdentifier:PhotoCellIdentifier forIndexPath:indexPath]; Photo *photo = [self photoAtIndexPath:indexPath]; cell.label.text = photo.name; return cell; } - (Photo *)photoAtIndexPath:(NSIndexPath *)indexPath { return photos[indexPath.row]; }
21. @interface ArrayDataSource <UITableViewDataSource> @property (nonatomic, strong) NSArray *items; @property (nonatomic, strong) NSString *cellIdentifier; @property (nonatomic, copy) void(^cellConfigurationBlock)(id cell, id item); - (instancetype)initWithItems:(NSArray *)items cellIdentifier:(NSString *)cellIdentifier cellConfigurationBlock:(void(^)(id cell, id item))cellConfigurationBlock; @end
22. @implementation ArrayDataSource - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return self.items.count; } - (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { id cell = [tableView dequeueReusableCellWithIdentifier:self.cellIdentifier forIndexPath:indexPath]; if (self.cellConfigurationBlock) { id item = [self itemAtIndexPath:indexPath]; self.cellConfigurationBlock(cell, item); } return cell; } - (id)itemAtIndexPath:(NSIndexPath *)indexPath { return self.items[indexPath.row]; } @end
23. configurationBlock = ^(PhotoCell *cell, Photo *item) { cell.label.text = item.name; }; _dataSource = [[ArrayDataSource alloc] initWithItems:self.photos cellIdentifier:@"PhotoCellIdentifier" cellConfigurationBlock:configurationBlock]; _tableView.dataSource = _dataSource;
24. 2. LÓGICAS DE DOMÍNIO
25. VIEWCONTROLLER - (Folder *)getRootFolder:(Folder *)folder { if (folder.parent == nil) return folder; return [self getRootFolder:folder]; }
26. FOLDER+EXTENSIONS - (Folder *)rootFolder { if (self.parent == nil) return self; return [self rootFolder]; }
27. FOLDER @property (nonatomic, readonly) Folder *rootFolder; - (Folder *)rootFolder { if (self.parent == nil) return self; return self.parent.rootFolder; }
28. 3. LÓGICAS DE SERVIÇO
29. VIEWCONTROLLER AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]; [manager GET:@"http://example.com/profiles.json" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) { NSLog(@"JSON: %@", responseObject); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { NSLog(@"Error: %@", error); }];
30. STORES OU REPOSITORIES
31. CANDIDATOS À STORE WEB SERVICES DATABASES FILESYSTEM LOCATION/MOTION SERVICES CAMERA
32. PROFILE STORE - (void)fetchAllProfilesWithCallback:(void(^)(NSArray *, NSError *))callbackBlock { [_manager GET:[self urlForPath:@"profiles.json"] parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) { NSArray *objects = // serialize from responseObject if (callbackBlock) callbackBlock(objects, nil); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { if (callbackBlock) callbackBlock(@[], error); }]; }
33. PROFILE STORE [[ProfileStore store] fetchAllProfilesWithCallback:^(NSArray *objects, NSError *error){ [_loadingView removeFromSuperview]; if (error) { // log or show error message } else { _tableView.dataSource.items = objects; [_tableView reloadData]; } }];
34. PROFILE+REPOSITORY + (void)allProfilesWithCallback:(void(^)(NSArray *, NSError *)); + (void)profileForId:(NSUInteger)identifier callback:(void(^)(Profile *, NSError *)); - (void)deleteWithCallback:(void(^)(NSError *)); - (void)saveWithCallback:(void(^)(NSError *));
35. 4. HIERARQUIA DE VIEWS
37. + (UIAppearance *)appearance; [UIActivityIndicatorView appearance].color = [UIColor blueColor];
38. @implementation MyCustomView - (void)awakeFromNib { [super awakeFromNib]; // Customization self.layer.cornerRadius = 3.0f; self.layer.borderWidth = 1.0f; self.layer.borderColor = [UIColor yellowColor].CGColor; self.layer.masksToBounds = YES; } @end
39. OBJECTIVE-C IB_DESIGNABLE @interface EllipseView : UIView @property (nonatomic, retain) IBInspectable UIColor *fillColor; @end
40. SWIFT @IBDesignable class StarView : UIView { @IBInspectable var starColor:UIColor required init(coder aDecoder: NSCoder) { starColor = UIColor.yellowColor(); super.init(coder: aDecoder) } override init(frame: CGRect) { starColor = UIColor.yellowColor(); super.init(frame: frame) } }
41. 5. CHILD VIEW CONTROLLERS
44. [self addChildViewController:otherViewController]
45. VIEWCONTROLLER LIFECYCLE - (void)viewDidLoad; - (void)viewWillAppear:(BOOL)animated; - (void)viewDidAppear:(BOOL)animated; - (void)viewWillDisappear:(BOOL)animated; - (void)viewDidDisappear:(BOOL)animated;
46. ORIENTATION CHANGES - (void)willRotateToInterfaceOrientation:duration:
47. STATUS BAR - (UIViewController *)childViewControllerForStatusBarHidden; - (UIViewController *)childViewControllerForStatusBarStyle;
48. 6. INTENTIONS
49. VIEWCONTROLLER @interface ViewController() <UITextFieldDelegate> @property (nonatomic, weak) IBOutlet UITextField *textField; @end
50. VIEWCONTROLLER - (void)viewDidLoad { [super viewDidLoad]; self.person = [[Person alloc] init]; self.person.name = @"John"; [self updateTextField]; } - (void)updateTextField { self.textField.text = self.person.name; }
51. VIEWCONTROLLER - (IBAction)reverse:(id)sender { self.person.name = self.textField.text.reversedString; [self updateTextField]; } - (IBAction)uppercase:(id)sender { self.person.name = self.textField.text.uppercaseString; [self updateTextField]; }
52. VIEWCONTROLLER - (BOOL)textFieldShouldReturn:(UITextField *)textField { [textField resignFirstResponder]; return NO; }
53. INTENTION @implementation DismissOnEnterIntention - (BOOL)textFieldShouldReturn:(UITextField *)textField { [textField resignFirstResponder]; return NO; } @end
54. INTENTION @interface PersonContainer : NSObject @property (nonatomic, strong) Person *person; @end @interface UppercaseIntention : NSObject @property (nonatomic, weak) IBOutlet UITextField *textField; @property (nonatomic, weak) IBOutlet PersonContainer *personContainer; @end
55. @implementation UppercaseIntention - (IBAction)uppercase:(id)sender { self.person.name = self.textField.text.uppercaseString; [self updateTextField]; } - (void)updateTextField { self.textField.text = self.personContainer.person.name; } @end
57. OUTRAS LEITURAS ▸ https://bendyworks.com/single- responsibility-principle-ios/ ▸ http://jaythrash.com/blog/2014/08/25/ building-better-viewcontrollers/ ▸ http://chris.eidhof.nl/posts/intentions.html ▸ http://www.objc.io/issue-1/lighter-view- controllers.html
58. @GUSTAVOCSB