验证码倒计时

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-(void)openCountdown{

__block NSInteger time = 59; //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(time <= 0){ //倒计时结束，关闭

dispatch_source_cancel(_timer);

dispatch_async(dispatch_get_main_queue(), ^{

//设置按钮的样式

[self.sentCodeBtn setTitle:@"重新发送"forState:UIControlStateNormal];

[self.sentCodeBtn setTitleColor:[UIColorcolorWithHexString:@"#FFFFFF"] forState:UIControlStateNormal];

[self.sentCodeBtn setBackgroundColor:COLOR_HEX(@"#1F961B")];

self.sentCodeBtn.userInteractionEnabled = YES;

});

}else{

int seconds = time % 60;

dispatch_async(dispatch_get_main_queue(), ^{

//设置按钮显示读秒效果

[self.sentCodeBtn setTitle:[NSStringstringWithFormat:@"%.2d", seconds] forState:UIControlStateNormal];

[self.sentCodeBtn setTitleColor:[UIColorcolorWithHexString:@"#FFFFFF"] forState:UIControlStateNormal];

self.sentCodeBtn.userInteractionEnabled = NO;

});

time--;

}

});

dispatch_resume(_timer);

}

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