5-1 RAC映射

#import "ViewController.h"

#import <ReactiveObjC.h>
#import <RACReturnSignal.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //flattenMap 一般用于信号中的信号
    RACSubject * signalOfSignal = [RACSubject subject];
    RACSubject * signal = [RACSubject subject];
    
    //订阅信号
//    [signalOfSignal subscribeNext:^(RACSignal * x) {
//        [x subscribeNext:^(id  _Nullable x) {
//            NSLog(@"%@",x);
//        }];
//    }];
    
//    [signalOfSignal.switchToLatest subscribeNext:^(id  _Nullable x) {
//        NSLog(@"%@",x);
//    }];

   [[signalOfSignal flattenMap:^__kindof RACSignal * _Nullable(id  _Nullable value) {
        return value;
    }] subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
   
//    [bindSignal subscribeNext:^(id  _Nullable x) {
//        NSLog(@"%@",x);
//    }];
    
    //发送信号
    [signalOfSignal sendNext:signal];
    [signal sendNext:@"123"];
    
    
    
}
-(void)mapDemo{
    //创建信号
    RACSubject * subject = [RACSubject subject];
    
    //绑定
    [[subject map:^id _Nullable(id  _Nullable value) {
        //返回的数据就是需要处理的数据
        return [NSString stringWithFormat:@"处理数据%@",value];
    }] subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
    
    
    //发送数据
    [subject sendNext:@"123"];
    [subject sendNext:@"321"];

}


-(void)flattenMapDemo{
    //创建信号
    RACSubject * subject = [RACSubject subject];
    
    //绑定信号
    RACSignal * bindSignal = [subject flattenMap:^__kindof RACSignal * _Nullable(id  _Nullable value) {
        //block:只要源信号发送内容就会调用
        //value:就是源信号发送的内容
        value = [NSString stringWithFormat:@"处理数据:%@",value];
        
        //返回信号用来包装修改过的内容
        return [RACReturnSignal return:value];
    }];
    
    //订阅绑定信号
    [bindSignal subscribeNext:^(id  _Nullable x) {
        NSLog(@"%@",x);
    }];
    
    //发送数据
    [subject sendNext:@"123"];

}