////  CountdownButton.h//  Standardization////  Created by YuFly on 2017/10/16.//  Copyright © 2017年 strong. All rights reserved.//#import 
     
      @class CountdownButton;typedef void(^Completion)(CountdownButton *countdownButton);@interface CountdownButton : UIButton/** 倒计时 @param startTime  倒计时时间 @param timeUnit   时间单位 @param completion 结束回调 */- (void)countDownButtonWithStartTime:(NSInteger)startTime                           timeUnit:(NSString *)timeUnit                            endTitle:(NSString *)endTitle                          completion:(Completion)completion;@end
     

////  CountdownButton.m//  Standardization////  Created by YuFly on 2017/10/16.//  Copyright © 2017年 strong. All rights reserved.//#import "CountdownButton.h"@implementation CountdownButton- (void)countDownButtonWithStartTime:(NSInteger)startTime                            timeUnit:(NSString *)timeUnit                            endTitle:(NSString *)endTitle                          completion:(Completion)completion{    __unsafe_unretained CountdownButton *ws=self;    NSInteger beginTime = startTime;    if([[timeUnit lowercaseString] isEqualToString:@"s"])        beginTime = startTime;    else if([[timeUnit lowercaseString] isEqualToString:@"min"])        beginTime = startTime*60;    else if([[timeUnit lowercaseString] isEqualToString:@"h"])        beginTime = startTime*60*60;    __block NSInteger remainTime = beginTime;    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_TIME_NOW, 1.0 * NSEC_PER_SEC, 0 * NSEC_PER_SEC);    dispatch_source_set_event_handler(timer, ^{        if (remainTime <= 0) { // 倒计时结束            dispatch_source_cancel(timer);            dispatch_async(dispatch_get_main_queue(), ^{                 [ws setTitle:[NSString stringWithFormat:@"%@",endTitle] forState:UIControlStateDisabled];                ws.enabled = YES;                completion(ws);            });        } else {            NSString *timeStr = [ws getMMSSFromSS:[NSString stringWithFormat:@"%ld", remainTime] timeUnit:timeUnit];            dispatch_async(dispatch_get_main_queue(), ^{                [ws setTitle:[NSString stringWithFormat:@"允许%@倒计时%@",endTitle,timeStr] forState:UIControlStateDisabled];                ws.enabled = NO;            });            remainTime--;        }    });    dispatch_resume(timer);}-(NSString *)getMMSSFromSS:(NSString *)timeString timeUnit:(NSString *)timeUnit{        NSInteger seconds = [timeString integerValue];    NSString *hour = [NSString stringWithFormat:@"%02ld",seconds/3600];    NSString *minute = [NSString stringWithFormat:@"%02ld",(seconds%3600)/60];    NSString *second = [NSString stringWithFormat:@"%02ld",seconds%60];    NSString *format_time = [NSString stringWithFormat:@"%@:%@:%@",hour,minute,second];        if([[timeUnit lowercaseString] isEqualToString:@"s"])    {        format_time= timeUnit;    }    else if([[timeUnit lowercaseString] isEqualToString:@"min"])    {        format_time = [NSString stringWithFormat:@"%@:%@",minute,second];    }    return format_time;}@end