imageView添加陰影和邊框

 

注意：大量設置陰影會造成卡頓！！！

用上這句之后流暢度大大增加：imageV.layer.shouldRasterize = YES;

例：

        // 設置陰影

        imageV.layer.shadowOffset = CGSizeMake(4, 0);

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

        imageV.layer.shadowOpacity = 0.6;

        imageV.layer.shadowRadius = 3;

        imageV.layer.shouldRasterize = YES;