关于Sketch的shadow属性

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admin

sketch中的shadow这些属性,如果直接对应iOS的layer上的属性有很多是找不到的.譬如 blur,spread

在stackoverflow上有相关的内容 https://stackoverflow.com/questions/34269399/how-to-control-shadow-spread-and-blur
虽然没有直接对应的layer属性,但是可以通过相关计算得到.可以为CALayer写个分类

/**
 apply to sketch shadow values

 @param color shadow color
 @param alpha shadow opacity
 @param x x
 @param y y
 @param blur blur
 @param spread spread
 */
-(void)applySketchShadowWithColor:(UIColor *)color
                            alpha:(float)alpha
                                x:(CGFloat)x
                                y:(CGFloat)y
                             blur:(CGFloat)blur
                           spread:(CGFloat)spread
{
    self.shadowColor = color.CGColor;
    self.shadowOpacity = alpha;
    self.shadowOffset = (CGSize){x,y};
    self.shadowRadius = blur / 2.0;
    if (spread == 0) {
        self.shadowPath = nil;
    } else {
        CGFloat dx = -spread;
        CGRect rect = CGRectInset(self.bounds, dx, dx);
        self.shadowPath = [UIBezierPath bezierPathWithRect:rect].CGPath;
    }
}