设置view任意边框border

CALayer *bottomBorder = [CALayer layer];

    bottomBorder.frame = CGRectMake(0.0f, 0.0f, 1.0f, _userPhoneTF.frame.size.height);

    bottomBorder.backgroundColor = [UIColor colorWithWhite:0.8f

                                                    alpha:1.0f].CGColor;

    [view.layer addSublayer:bottomBorder];