iOS为UIView设置阴影效果

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;

总结

以上就是这篇文章的全部内容，希望能对各位ios开发者们能有所帮助，如果有疑问大家可以留言交流。