参考：https://juejin.im/post/5dd4cd71f265da0bf80b5820
- (void)sketchSetShadow:(UIColor *)color alpha:(CGFloat)alpha x:(CGFloat)x y:(CGFloat)y blur:(CGFloat)blur spread:(CGFloat)spread
{
self.shadowOffset = CGSizeMake(x, y);
self.shadowRadius = blur * 0.5;
self.shadowColor = color.CGColor;
self.shadowOpacity = alpha;
CGRect rect = CGRectInset(self.bounds, -spread, -spread);
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:self.cornerRadius];
self.shadowPath = path.CGPath;
}
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