.h
@property (nonatomic, strong)UIButton *verificationCodeButton;
.m
在某个方法里实现
_verificationCodeButton = [UIButton buttonWithType:UIButtonTypeCustom];
_verificationCodeButton.frame = CGRectMake(10, 200, 300, 40);
_verificationCodeButton.backgroundColor = [UIColor grayColor];
[self.view addSubview:_verificationCodeButton];
__block int timeout=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(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
[_verificationCodeButton setTitle:@"发送验证码" forState:UIControlStateNormal];
_verificationCodeButton.userInteractionEnabled = YES;
});
}else{
int seconds = timeout % 60;
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];
[_verificationCodeButton setTitle:[NSString stringWithFormat:@"%@秒后重新发送",strTime] forState:UIControlStateNormal];
[UIView commitAnimations];
_verificationCodeButton.userInteractionEnabled = NO;
});
timeout--;
}
});
dispatch_resume(_timer);
