Using RAC to realize the sending logic of verification code

Preface

In the project, mobile phone verification code login and registration pages have the need to send verification code . I have been using my own timer to do the corresponding processing before , I've been watching RAC Something related , I just see that the timer conforms to some previous design scenarios , It's a simple implementation .

Import RAC

My training program is Objective-C Project , So before podfile Add... To the document pod ‘ReactiveObjC’, ‘~> 3.0.0’, direct pod install

then , Import the header file on the required page #import "ReactiveObjC.h".

Specific code

#import "ViewController.h"
#import "ReactiveObjC.h"
@interface ViewController ()

@property (nonatomic, strong) RACDisposable *btnDispose;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    
    UIButton *button = [UIButton new];
    [button setTitle:@" Send verification code " forState:UIControlStateNormal];
    button.backgroundColor = [UIColor blueColor];
    button.layer.cornerRadius = 0;
    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    button.frame = CGRectMake(100, 100, 200, 40);
    [self.view addSubview:button];
   
    // Create the semaphore of the button click , And listen for click events 
    [[button rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
        
        button.enabled = NO;
        __block int time = 5;
        
        //subscribeNext Return to one RACDisposable, Can be used to unsubscribe 
        self.btnDispose =  [[RACSignal interval:1.0 onScheduler:[RACScheduler mainThreadScheduler]] subscribeNext:^(NSDate * _Nullable x) {
            // After the timer executes , utilize time To monitor whether the countdown is over 
            time--;
            NSString *title = time == 0 ? @" Send verification code " : [NSString stringWithFormat:@" Please wait %d Second retransmission ",time];
            [button setTitle:title forState:UIControlStateNormal];
            button.enabled = time == 0 ? YES : NO;
            button.layer.cornerRadius = 15;
            button.backgroundColor = [UIColor greenColor];

            if(time == 0){
                button.layer.cornerRadius = 0;
                button.backgroundColor = [UIColor blueColor];
                // Unsubscribe 
                [self.btnDispose dispose];
            }
        }];
        
    }];
    
    }

I changed the rounded corner and background color of the button after the countdown , It is convenient to distinguish different states . The renderings are as follows