登录验证码发送练习.png

这里有涉及到强引用的问题，具体请观看3-4 登陆验证码发送的练习视频内容

登录验证码xib建立.png

#import "ViewController.h"
#import <ReactiveObjC.h>
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIButton *reSendBtn;
/**  */
@property(assign,nonatomic)int time;
/**   */
@property(nonatomic,strong)RACDisposable  * disposable;
/**   */
@property(nonatomic,strong)RACSignal * signal;
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
 }
//发送验证码按钮点击
- (IBAction)reSendClick:(id)sender {
    //改变按钮状态
    self.reSendBtn.enabled = NO;
    //设置倒计时
    self.time = 10;
    //每一秒进来
    self.signal = [RACSignal interval:1.0 onScheduler:[RACScheduler mainThreadScheduler]];
    
    self.disposable = [self.signal subscribeNext:^(NSDate * _Nullable x) {
        NSLog(@"%@",self);
        //时间先减少!
        _time--;
        //设置文字
        NSString * btnText = _time > 0 ? [NSString stringWithFormat:@"请等待%d秒",_time]
                                    : @"重新发送";
        [self.reSendBtn setTitle:btnText forState:_time > 0?(UIControlStateDisabled):(UIControlStateNormal)];
        //设置按钮
        if(_time > 0){
            _reSendBtn.enabled = NO;
        }else{
            _reSendBtn.enabled = YES;
            //取消订阅!!
            [_disposable dispose];
        }
    }];
 }
-(void)dealloc{
    NSLog(@"来了");
}
-(void)timerDemo{
    //RAC tiemr 让你上瘾!!
    [[RACSignal interval:1.0 onScheduler:[RACScheduler scheduler]] subscribeNext:^(NSDate * _Nullable x) {
        NSLog(@"%@",[NSThread currentThread]);
    }];
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    
    [self dismissViewControllerAnimated:YES completion:nil];
}
@end

#import <UIKit/UIKit.h>

@interface HKViewController : UIViewController

@end

#import "HKViewController.h"

@interface HKViewController ()

@end

@implementation HKViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}