ios - UITextField 只有上下边框

Question

我目前有一个常规边界。我只想有一个顶部和底部边框。

我该如何做到这一点？

使用UITextField'slayer属性，我有以下代码：

    self.layer.borderColor = [[UIColor colorWithRed:160/255.0f green:160/255.0f blue:160/255.0f alpha:1.0f] CGColor];
    self.layer.borderWidth = 4.0f;

我通过让我的 UITextField extra long让它工作起来，这样用户就看不到左右边框，但我只是想知道是否有更好的、不那么骇人听闻的方式来做到这一点？

我已经检查了文档，并且更改 aUITextField没有borderStyle此选项。

从，

iOS 初学者

score 77 · Accepted Answer

我发现一种效果很好的方法是使用图层。这是一个片段：

CALayer *bottomBorder = [CALayer layer];
bottomBorder.frame = CGRectMake(0.0f, self.frame.size.height - 1, self.frame.size.width, 1.0f);
bottomBorder.backgroundColor = [UIColor blackColor].CGColor;
[myTextField.layer addSublayer:bottomBorder];

希望这可以帮助某人。

score 42 · Accepted Answer

@user3075378 在 Swift 中的伟大而简单的例子

var bottomBorder = CALayer()
bottomBorder.frame = CGRectMake(0.0, textField.frame.size.height - 1, textField.frame.size.width, 1.0);
bottomBorder.backgroundColor = UIColor.blackColor().CGColor
textField.layer.addSublayer(bottomBorder)

score 22 · Accepted Answer

@Sebyddd 为什么停在那里？(;

编辑：在自动布局为视图设置正确的框架之前绘制线条存在问题，我通过修复编辑了我的答案：它基本上涉及drawLines()调用layoutSubviews()：

class FramedTextField: UITextField {

    @IBInspectable var linesWidth: CGFloat = 1.0 { didSet{ drawLines() } }

    @IBInspectable var linesColor: UIColor = UIColor.blackColor() { didSet{ drawLines() } }

    @IBInspectable var leftLine: Bool = false { didSet{ drawLines() } }
    @IBInspectable var rightLine: Bool = false { didSet{ drawLines() } }
    @IBInspectable var bottomLine: Bool = false { didSet{ drawLines() } }
    @IBInspectable var topLine: Bool = false { didSet{ drawLines() } }



    func drawLines() {

        if bottomLine {
            add(CGRectMake(0.0, frame.size.height - linesWidth, frame.size.width, linesWidth))
        }

        if topLine {
            add(CGRectMake(0.0, 0.0, frame.size.width, linesWidth))
        }

        if rightLine {
            add(CGRectMake(frame.size.width - linesWidth, 0.0, linesWidth, frame.size.height))
        }

        if leftLine {
            add(CGRectMake(0.0, 0.0, linesWidth, frame.size.height))
        }

    }

    typealias Line = CGRect
    private func add(line: Line) {
        let border = CALayer()
        border.frame = line
        border.backgroundColor = linesColor.CGColor
        layer.addSublayer(border)
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        drawLines()
    }

}

score 9 · Accepted Answer

您可以创建一个带有顶部和底部边框的图像，并将其设置为 UITextField 的背景：

yourTextField.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"yourBorderedImageName"]];

score 5 · Accepted Answer

您还可以将视图添加到顶部和底部以用作边框。

// Top border
UIView *topBorder = [[UIView alloc]
    initWithFrame:CGRectMake(0,
                             0,
                             textfield.frame.size.width,
                             4.0f)];
topBorder.backgroundColor = [UIColor colorWithRed:160/255.0f
                                            green:160/255.0f
                                             blue:160/255.0f
                                            alpha:1.0f];
[textfield addSubview:topBorder];

// Bottom border
UIView *bottomBorder = [[UIView alloc]
    initWithFrame:CGRectMake(0,
                             textfield.frame.origin.y +
                                 textfield.frame.size.height - 4.0f,
                             textfield.frame.size.width,
                             4.0f)];
bottomBorder.backgroundColor = [UIColor colorWithRed:160/255.0f
                                               green:160/255.0f
                                                blue:160/255.0f
                                               alpha:1.0f];
[textfield addSubview:bottomBorder];

score 5 · Accepted Answer

您可以使用图层将线条/形状添加到任何 UIView 子类。此代码在文本字段的顶部和底部绘制两行。您可以将它添加到控件的子类中，或者直接在父视图/视图控制器中调用它。

CGRect layerFrame = CGRectMake(0, 0, _usernameField.frame.size.width, _usernameField.frame.size.height);
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, 0, 0);
CGPathAddLineToPoint(path, NULL, layerFrame.size.width, 0); // top line
CGPathMoveToPoint(path, NULL, 0, layerFrame.size.height);
CGPathAddLineToPoint(path, NULL, layerFrame.size.width, layerFrame.size.height); // bottom line
CAShapeLayer * line = [CAShapeLayer layer];
line.path = path;
line.lineWidth = 2;
line.frame = layerFrame;
line.strokeColor = [UIColor blackColor].CGColor;
[_usernameField.layer addSublayer:line];

score 2 · Accepted Answer

Swift 3：使用 AutoLayout 进行清理（我在这里使用 PureLayout，但您也可以使用常见的 NSLayoutConstraint：

func makeUnderline(for textField: UITextField) {
    let borderLine = UIView()
    borderLine.backgroundColor = UIColor.black
    borderLine.autoSetDimension(.height, toSize: 1)
    textField.addSubview(borderLine)
    borderLine.autoPinEdgesToSuperviewEdges(with: UIEdgeInsets.zero, excludingEdge: .top)
}

score 1 · Accepted Answer

我建议您在文本字段的左侧放置一个视图，在文本字段的右侧放置一个视图以覆盖左/右边框。

UIView *v1 = [[UIView all] initWithFrame:CGRectMake(textfield.frame.origin.x - 5, textfield.frame.origin.y, 10, textifield.frame.size.height)];
UIView *v2 = [[UIView all] initWithFrame:CGRectMake(textfield.frame.origin.x + textfield.frame.size.with - 5, textfield.frame.origin.y, 10, textifield.frame.size.height)];

score 1 · Accepted Answer

希望这会有所帮助，将其放在文本字段覆盖类中

UIView *view = [[UIView alloc] init];
        view.translatesAutoresizingMaskIntoConstraints = NO;
        view.layer.borderWidth = 1;
        view.backgroundColor = [UIColor blackColor];
        [self addSubview:view];

        [self addConstraint:[NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0]];
        [self addConstraint:[NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeWidth multiplier:1.0 constant:0.0]];
        [self addConstraint:[NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeHeight multiplier:1.0 constant:1.0]];
        [self addConstraint:[NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:1.0]];

score 0 · Accepted Answer

感谢用户 3075378。我的回答是基于他的。添加左右小线。

- (void)styleSearchTextField {
    CALayer *bottomBorder = [CALayer layer], *leftBorder = [CALayer layer], *rightBorder = [CALayer layer];

    CGFloat thickness = 1.0f;
    CGFloat side_height = 6.0f;

    bottomBorder.frame = CGRectMake(0.0f, searchTextField.frame.size.height - 1, searchTextField.frame.size.width, thickness);

    leftBorder.frame = CGRectMake(0.0f, searchTextField.frame.size.height - side_height, thickness, searchTextField.frame.size.height - 1);

    rightBorder.frame = CGRectMake(searchTextField.frame.size.width - 1, searchTextField.frame.size.height - side_height, thickness, searchTextField.frame.size.height - 1);

    bottomBorder.backgroundColor = [self.stylingDetails themeGrayColor].CGColor;
    leftBorder.backgroundColor = [self.stylingDetails themeGrayColor].CGColor;
    rightBorder.backgroundColor = [self.stylingDetails themeGrayColor].CGColor;

    [searchTextField.layer addSublayer:bottomBorder];
    [searchTextField.layer addSublayer:leftBorder];
    [searchTextField.layer addSublayer:rightBorder];
}

score 0 · Accepted Answer

为 Swift 5 更新

var bottomBorder = CALayer()
bottomBorder.frame = CGRect(x: xVal, y: yVal, width: w, height: h)
bottomBorder.backgroundColor = UIColor.black.cgColor
searchBar.layer.addSublayer(bottomBorder)

ios - UITextField 只有上下边框

11 回答 11

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