Created
March 25, 2014 12:09
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Example usage of ReactiveCocoa in a ViewModel for a UITableView(Controller) holding data in a mutable array with a command to load and reload data.
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| #import <Objection/Objection.h> | |
| #import <ReactiveCocoa/ReactiveCocoa.h> | |
| #import <ReactiveCocoa/RACEXTScope.h> | |
| #import "TableDataViewModel.h" | |
| #import "RestApiConnector.h" | |
| const NSUInteger kPageSize = 30; | |
| @interface TableDataViewModel () | |
| @property(nonatomic, readonly) RestApiConnector *rest; | |
| @property(nonatomic) NSMutableArray *data; | |
| @property(nonatomic) RACCommand *loadCommand; | |
| @end | |
| @implementation TableDataViewModel | |
| objection_requires_sel(@selector(rest)) | |
| - (id)init { | |
| self = [super init]; | |
| if (self) { | |
| [self configureLoadCommand]; | |
| [self configureActiveSignal]; | |
| } | |
| return self; | |
| } | |
| - (void)configureActiveSignal { | |
| @weakify(self); | |
| RACSignal *dBA = [[self.didBecomeActiveSignal filter:^BOOL(id value) { | |
| @strongify(self); | |
| return self.data == nil; | |
| }] mapReplace:@TRUE]; | |
| [self.loadCommand rac_liftSelector:@selector(execute:) withSignals:dBA, nil]; | |
| } | |
| - (void)configureLoadCommand { | |
| @weakify(self); | |
| self.loadCommand = [[RACCommand alloc] initWithSignalBlock:^(NSNumber *reload) { | |
| @strongify(self); | |
| return [[self.rest getDataForPage:reload ? 0 : self.data.count / kPageSize size:kPageSize] map:^id(id value) { | |
| return RACTuplePack_(reload, value); | |
| }]; | |
| }]; | |
| self.loadCommand.allowsConcurrentExecution = FALSE; | |
| RAC(self, data) = [[self.loadCommand.executionSignals flatten] reduceEach:^NSMutableArray *(NSNumber *reload, NSArray *data) { | |
| @strongify(self); | |
| if ([reload boolValue]) { | |
| return [data mutableCopy]; | |
| } else { | |
| NSMutableArray *array = [self.data mutableCopy]; | |
| [array addObjectsFromArray:data]; | |
| return array; | |
| } | |
| }]; | |
| } | |
| @end |
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