1）、设置tempDurationOfCountDown的值
2）、tempDurationOfCountDown的作用：倒计时；与durationOfCountDown配合判断当前IDCountDownButton是否具备重新开始倒计时的能力
- (void)setDurationOfCountDown:(NSInteger)durationOfCountDown {
_durationOfCountDown = durationOfCountDown;
self.tempDurationOfCountDown = _durationOfCountDown;
}
初始化
1）、设置倒计时的默认时长为60妙
2）、设置IDCountDownButton默认的title为“获取验证码”
- (instancetype)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
// 设置默认的倒计时时长为60秒
self.durationOfCountDown = 60;
// 设置button的默认标题为“获取验证码”
[self setTitle:@"获取验证码" forState:UIControlStateNormal];
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
if (self = [super initWithCoder:aDecoder]) {
// 设置默认的倒计时时长为60秒
self.durationOfCountDown = 60;
// 设置button的默认标题为“获取验证码”
[self setTitle:@"获取验证码" forState:UIControlStateNormal];
}
return self;
}
拦截IDCountDownButton的点击事件，判断是否开始倒计时
1）、若tempDurationOfCountDown等于durationOfCountDown，说明未开始倒计时，响应并传递IDCountDownButton的点击事件；否则，不响应且不传递。
- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event {
// 若正在倒计时，不响应点击事件
if (self.tempDurationOfCountDown != self.durationOfCountDown) {
return NO;
}
// 若未开始倒计时，响应并传递点击事件，开始倒计时
[self startCountDown];
return [super beginTrackingWithTouch:touch withEvent:event];
}
倒计时
1）、创建定时器，开始倒计时
- (void)startCountDown {
// 创建定时器
self.countDownTimer = [NSTimer timerWithTimeInterval:1 target:self selector:@selector(updateIDCountDownButtonTitle) userInfo:nil repeats:YES];
// 将定时器添加到当前的RunLoop中（自动开启定时器）
[[NSRunLoop currentRunLoop] addTimer:self.countDownTimer forMode:NSRunLoopCommonModes];
}
2）、更新IDCountDownButton的title为倒计时剩余的时间
- (void)updateIDCountDownButtonTitle {
if (self.tempDurationOfCountDown == 0) {
// 设置IDCountDownButton的title为开始倒计时前的title
[self setTitle:self.originalTitle forState:UIControlStateNormal];
// 恢复IDCountDownButton开始倒计时的能力
self.tempDurationOfCountDown = self.durationOfCountDown;
[self.countDownTimer invalidate];
} else {
// 设置IDCountDownButton的title为当前倒计时剩余的时间
[self setTitle:[NSString stringWithFormat:@"%zd秒", self.tempDurationOfCountDown--] forState:UIControlStateNormal];
}
}
