先来看看效果图
这个效果写起来挺简单，主要运用下面几个知识点
layer 的mask : 图层蒙版
layer 的shadowPath ： 绘制自定义形状阴影
UIBezierPath ：绘制六边形路线
说完知识点下面上代码了
绘制六边形的路线
-(CGPathRef)getCGPath:(CGFloat)viewWidth{
UIBezierPath * path = [UIBezierPath bezierPath];
path.lineWidth = 2;
[[UIColor whiteColor] setStroke];
[path moveToPoint:CGPointMake((sin(M_1_PI / 180 * 60)) * (viewWidth / 2), (viewWidth / 4))];
[path addLineToPoint:CGPointMake((viewWidth / 2), 0)];
[path addLineToPoint:CGPointMake(viewWidth - ((sin(M_1_PI / 180 * 60)) * (viewWidth / 2)), (viewWidth / 4))];
[path addLineToPoint:CGPointMake(viewWidth - ((sin(M_1_PI / 180 * 60)) * (viewWidth / 2)), (viewWidth / 2) + (viewWidth / 4))];
[path addLineToPoint:CGPointMake((viewWidth / 2), viewWidth)];
[path addLineToPoint:CGPointMake((sin(M_1_PI / 180 * 60)) * (viewWidth / 2), (viewWidth / 2) + (viewWidth / 4))];
[path closePath];
return path.CGPath;
}绘制一个六边形的layer，并把image 赋值到contents 上
CGRect hexagnoRect = self.bounds;
//绘制一个六边形的layer，并复制一个image给他的contents
CALayer *hexagonLayer = [CALayer layer];
hexagonLayer.frame = hexagnoRect;
CAShapeLayer * shapLayer = [CAShapeLayer layer];
shapLayer.lineWidth = 1;
shapLayer.strokeColor = [UIColor whiteColor].CGColor;
shapLayer.path = [self getCGPath:hexagnoRect.size.width-20];
hexagonLayer.mask = shapLayer;
hexagonLayer.contents = (__bridge id _Nullable)(self.image.CGImage);创建一个CALayer，将六边形layer 添加到CALayer上,并绘制模糊阴影
CALayer *completeLayer = [CALayer layer];
completeLayer.frame = CGRectMake(10, 10, self.bounds.size.width-10, self.bounds.size.height-10);
[completeLayer addSublayer:hexagonLayer];
completeLayer.shadowOpacity = 1.0f;
completeLayer.shadowPath = [self getCGPath:hexagnoRect.size.width];
completeLayer.shadowOffset = CGSizeMake(-10, -10);
completeLayer.shadowColor = self.hg_shadowColor.CGColor;
[self.layer addSublayer:completeLayer];总结
好了，以上就是在iOS中实现图片六边形的全部内容了，希望本文能对大家开发iOS有所帮助，如果有疑问大家可以留言交流。
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