圆角，单个圆角，阴影，边框（都是基本的东西）

1.加圆角

view.layer.cornerRadius = 8;

view.layer.masksToBounds = YES;

2.加单个圆角

UIBezierPath*path = [UIBezierPath bezierPathWithRoundedRect:sayWorldButton.bounds byRoundingCorners:UIRectCornerBottomLeft/*具体哪个角*/ cornerRadii:CGSizeMake(5,5)];

CAShapeLayer*la = [[CAShapeLayer alloc] init];

la.frame = <#要加圆角的控件#>.bounds;

la.path= path.CGPath;

<#要加圆角的控件#>.layer.mask = la;

3.加阴影

scanButton.layer.shadowColor= [UIColorblackColor].CGColor;//阴影的颜色

scanButton.layer.shadowOffset=CGSizeMake(1,1);//阴影的偏移量配合shadowRadius达到几条边有阴影的效果

scanButton.layer.shadowOpacity=0.5;//透明度

scanButton.layer.shadowRadius=1;//阴影大小

想要同是设置圆角和阴影

scanButton.layer.masksToBounds = YES;这个属性要去掉

4.加边框

view.layer.borderWidth = 5;

view.layer.borderColor = [[UIColor colorWithRed:0.52 green:0.09 blue:0.07 alpha:1] CGColor];