把UIView設定成正圓形

//把View設定成正圓形

        [profileImageView.layer setCornerRadius:profileImageView.frame.size.width / 2];

        [profileImageView.layer setMasksToBounds:YES];

//在View外面加上白框

        CALayer *_viewLayer = profileImageView.layer;

        UIColor *_borderColor    = [UIColor whiteColor];

        _viewLayer.borderColor   = [_borderColor CGColor];

        _viewLayer.borderWidth   = 2.0f;

        _viewLayer.shadowColor   = [[UIColor grayColor] CGColor];

        _viewLayer.shadowOffset  = CGSizeMake(0, 2);

        _viewLayer.shadowOpacity = 0.5;

        _viewLayer.shadowRadius  = 5.0f;