@interface AuthCodeManager : NSObject

+ (void)getValidCode:(UIButton *)sendCodeButton;

@end

#import "AuthCodeManager.h"

@implementation AuthCodeManager

# pragma mark -- 验证码重新发送按钮

+ (void)getValidCode:(UIButton *)sendCodeButton{

    

     [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil];

    __block int timeout = 120; //倒计时时间

    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

    dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue);

    dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0); //每秒执行

    dispatch_source_set_event_handler(_timer, ^{

        if(timeout<0){ //倒计时结束，关闭

            dispatch_source_cancel(_timer);

            dispatch_async(dispatch_get_main_queue(), ^{

                //设置界面的按钮显示 根据自己需求设置

                [sendCodeButton setTitle:@"重新发送" forState:UIControlStateNormal];

               

                sendCodeButton.enabled = YES;

            });

        }else{

            int seconds = timeout % 120;

            if (seconds == 0) {

                seconds = 120;

            }

            NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];

            dispatch_async(dispatch_get_main_queue(), ^{

                //设置界面的按钮显示 根据自己需求设置

                NSLog(@"____%@",strTime);

                [UIView beginAnimations:nil context:nil];

                [UIView setAnimationDuration:1];

               

                [sendCodeButton setTitle:[NSString stringWithFormat:@" %@ S ", strTime] forState:UIControlStateNormal];

                [UIView commitAnimations];

                 sendCodeButton.enabled = NO;

            });

            timeout--;

        }

    });

    dispatch_resume(_timer);

}

@end