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//方式一.纯代码设置指定圆角 https://www.jianshu.com/p/985f6d9f6543

_functionView = [[UIView alloc] initWithFrame:CGRectMake(0, SHeight, SWidth, FunctionViewHeight )]; _functionView.backgroundColor = [UIColor whiteColor];

   UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:_functionView.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii:CGSizeMake(12, 12)];
   CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
   maskLayer.frame = _functionView.bounds;
   maskLayer.path = maskPath.CGPath;
   _functionView.layer.mask = maskLayer;
   
   [self addSubview:_functionView];

//方式二.使用Xib， 要设置圆角的 view 继承 JQRadiusView ，然后在 IBInspectable 这个窗口可以直接设置圆角