需要设置 颜色 阴影半径 等元素
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UIView *shadowView = [[UIView alloc] init];
shadowView.frame = CGRectMake(100, 100, 100, 100);
shadowView.center = self.view.center;
shadowView.backgroundColor = [UIColor whiteColor];
//设置阴影颜色
shadowView.layer.shadowColor = [UIColor colorWithRed:114.0/255.0 green:133.0/255.0 blue:152.0/255.0 alpha:1.0].CGColor;
//设置阴影的透明度
shadowView.layer.shadowOpacity = 0.1f;
//设置阴影的偏移
shadowView.layer.shadowOffset = CGSizeMake(30.0f, 10.0f);
//设置阴影半径
shadowView.layer.shadowRadius = 15.0f;
//设置渲染内容被缓存
shadowView.layer.shouldRasterize = YES;
//超出父视图部分是否显示
shadowView.layer.masksToBounds = NO;
shadowView.layer.borderWidth = 0.0;
shadowView.layer.opaque = 0.10;
shadowView.layer.cornerRadius = 3.0;
//栅格化处理
shadowView.layer.rasterizationScale = [[UIScreen mainScreen]scale];
//正常矩形
UIBezierPath *path = [UIBezierPath bezierPathWithRect:shadowView.bounds];
shadowView.layer.shadowPath = path.CGPath;
[self.view addSubview:shadowView];
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