iOS为UIView设置阴影效果

织梦狗教程移动开发

2023-01-10

现在很多的开发者们都会在开发的时候加阴影效果，所以这篇文章跟大家分享下iOS为UIView设置阴影效果的实现过程，有需要的朋友们可以参考借鉴，下面来一起看看吧。

UIView的阴影设置主要通过UIView的layer的相关属性来设置

阴影的颜色


imgView.layer.shadowColor = [UIColor blackColor].CGColor;

阴影的透明度


imgView.layer.shadowOpacity = 0.8f;

阴影的圆角


imgView.layer.shadowRadius = 4.f;

阴影偏移量


imgView.layer.shadowOffset = CGSizeMake(4,4);


imgView.layer.shadowOffset = CGSizeMake(0,0);

其实从偏移量上可以看出来，即使偏移量为(0,0)时，围绕view的四周依然能看到一定阴影。

阴影的路径

除了通过上面的操作，我们还可以设定阴影的路径


//路径阴影
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(-5, -5)];
//添加直线
[path addLineToPoint:CGPointMake(paintingWidth /2, -15)];
[path addLineToPoint:CGPointMake(paintingWidth +5, -5)];
[path addLineToPoint:CGPointMake(paintingWidth +15, paintingHeight /2)];
[path addLineToPoint:CGPointMake(paintingWidth +5, paintingHeight +5)];
[path addLineToPoint:CGPointMake(paintingWidth /2, paintingHeight +15)];
[path addLineToPoint:CGPointMake(-5, paintingHeight +5)];
[path addLineToPoint:CGPointMake(-15, paintingHeight /2)];
[path addLineToPoint:CGPointMake(-5, -5)];
//设置阴影路径 
imgView.layer.shadowPath = path.CGPath;