iOS为UIView设置阴影效果

2020-07-26 03:10:26

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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;