iOS開發之UI控制項陰影效果

uiview的陰影設定主要通過uiview的layer的相關屬性來設定

imgview.layer.shadowcolor = [uicolor blackcolor].cgcolor;

imgview.layer.shadowopacity = 0.8f;

imgview.layer.shadowradius = 4.f;

imgview.layer.shadowoffset = cgsizemake(4,4);

效果

imgview.layer.shadowoffset = cgsizemake(0,0);

效果其實從偏移量上可以看出來，即使偏移量為(0,0)時，圍繞view的四周依然能看到一定陰影。

//路徑陰影

uibezierpath *path = [uibezierpath bezierpath];
[path movetopoint:cgpointmake(-5, -5)];
//新增直線
[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)];
//設定陰影路徑 
imgview.layer.shadowpath = path.cgpath;

效果有關uibezierpath的知識請看：

uibezierpath介紹

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