iOS ReactiveCocoa简单使用笔记

RACSignal *validField1Signal = [self.field1.rac_textSignal map:^id(NSString *text){
        return @([self isValidInput:text]);
    }];
    RAC(self.field1,backgroundColor) = [validField1Signal map:^id(NSNumber *valid){
        return [valid boolValue] ? [UIColor clearColor] : [UIColor yellowColor];
    }];
    
    RACSignal *validField2Signal = [self.field2.rac_textSignal map:^id(NSString *text){
        return @([self isValidInput:text]);
    }];
    RAC(self.field2,backgroundColor) = [validField2Signal map:^id(NSNumber *valid){
        return [valid boolValue] ? [UIColor clearColor] : [UIColor yellowColor];
    }];
    
    //! 聚合信号
    RACSignal *btnActiveSignal = [RACSignal combineLatest:@[validField1Signal,validField2Signal]
                                                   reduce:^id(NSNumber *valid1,NSNumber *valid2){
        return @([valid1 boolValue] && [valid2 boolValue]);
    }];
    [btnActiveSignal subscribeNext:^(NSNumber *btnActive){
        self.btn.enabled = [btnActive boolValue];
    }];



参考资料 : http://www.cocoachina.com/ios/20150123/10994.html