RAC_SimpleDemo

SimpleDemo.m

@interface Model:NSObject
@property (strong, nonatomic) NSString *content;
@end

@implementation Model
@end

@interface ViewModel:NSObject
@property (strong, nonatomic) NSString *content;
- (void) execute:(NSString *)content;
@end

@implementation ViewModel
- (void) execute:(NSString *)content {
    // Step 5 : execute function
    [[RACScheduler mainThreadScheduler] afterDelay:3 schedule:^{
        Model *result = [Model new];
        result.content = @"result";
        // Step 6 : assign new value
        self.content = result.content;
    }];
}
@end

@interface View:UIViewController
@property (weak, nonatomic) IBOutlet UILabel *labelView;
@property (weak, nonatomic) IBOutlet UITextField *textView;
@property (weak, nonatomic) IBOutlet UIButton *btnButton;
@property (strong, nonatomic) ViewModel *viewModel;
@end

@implementation View
- (void) viewDidLoad {
    // Step 1 : assign view model
    _viewModel = [ViewModel new];
    
    // Step 2 : set button action
    [[self.btnButton rac_signalForControlEvents:UIControlEventTouchUpInside]
     subscribeNext:^(__kindof UIControl * _Nullable x) {
         // Step 4 : set text & execute
         [_viewModel execute:self.textView.text];
     }];
    
    // Step 3 : Regist observer
    [RACObserve(_viewModel, content) subscribeNext:^(id x) {
        // Step 7 : Refresh UIView
        [self.labelView setText:x];
    }];
}
@end