- (void)pulseClick
{　　 //!> 宽和高等比例转换
    CABasicAnimation * pulse = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    pulse.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    pulse.duration = 0.1;  //!> 动画持续时间
    pulse.repeatCount = ; //!> 动画重复次数
    pulse.autoreverses = YES;//!> 动画执行完毕是否自动还原(YES就是自动还原到比例为1的状态)

    pulse.fromValue = [NSNumber numberWithFloat:];  //!> 动画执行开始的比例
    pulse.toValue = [NSNumber numberWithFloat:0.5];  //!> 动画执行终点的比例
    [_button.layer addAnimation:pulse forKey:nil];
}

- (void)pulseClick
{
    CABasicAnimation * pulse = [CABasicAnimation animationWithKeyPath:@"cornerRadius"];
    pulse.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    pulse.duration = ;
    pulse.repeatCount = ;
    pulse.autoreverses = YES;

    pulse.fromValue = [NSNumber numberWithFloat:];
    pulse.toValue = [NSNumber numberWithFloat:];
    [_button.layer addAnimation:pulse forKey:nil];
}

- (void)pulseClick
{
    CABasicAnimation * pulse = [CABasicAnimation animationWithKeyPath:@"contents"];
    pulse.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    pulse.duration = ;
    pulse.repeatCount = ;
    pulse.autoreverses = YES;
    //!> Contents是CALayer的属性，一般就是用作CGImageRef，常见用法就是下面这种用法；
    pulse.fromValue = (id)[UIImage imageNamed:@"flower"].CGImage;
    pulse.toValue = (id)[UIImage imageNamed:@"leaf"].CGImage;
    [_button.layer addAnimation:pulse forKey:nil];
}

- (void)pulseClick
{　　 //!> 一闪一闪的动画效果
    CABasicAnimation * pulse = [CABasicAnimation animationWithKeyPath:@"opacity"];
    pulse.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    pulse.duration     = 0.3;
    pulse.repeatCount  = MAXFLOAT;
    pulse.fillMode     = kCAFillModeForwards;
    pulse.autoreverses = YES;

    pulse.fromValue = [NSNumber numberWithFloat:1.0];
    pulse.toValue   = [NSNumber numberWithFloat:0.2];

    [_button.layer addAnimation:pulse forKey:nil];
}