iOS7 - 更改UINavigationBar边框颜色

Question

是否可以在iOS7中更改UINavigationBar的灰色边框底部颜色？

我已经尝试移除到边框，但这不起作用：

[[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];

谢谢！

Answer 1

您正在删除阴影但不删除边框，您需要执行以下操作：

[[UINavigationBar appearance] setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
[[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];

要更改边框，请使用宽度为2像素的图像：

[[UINavigationBar appearance] setShadowImage:[UIImage imageNamed:@"2pxWidthLineImage"]]; 

Answer 2

这是另一种方式：

CALayer *border = [CALayer layer];
border.borderColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"border"]].CGColor;
border.borderWidth = 1;
CALayer *layer = self.navigationController.navigationBar.layer;
border.frame = CGRectMake(0, layer.bounds.size.height, layer.bounds.size.width, 1);
[layer addSublayer:border];

Answer 3

我发现改变颜色的唯一方法是：

override func viewDidLoad() {
    super.viewDidLoad()

    if let navigationController = self.navigationController {
        let navigationBar = navigationController.navigationBar
        let navigationSeparator = UIView(frame: CGRectMake(0, navigationBar.frame.size.height - 1, navigationBar.frame.size.width, 0.5))
        navigationSeparator.backgroundColor = UIColor.redColor() // Here your custom color
        navigationSeparator.opaque = true
        self.navigationController?.navigationBar.addSubview(navigationSeparator)
    }

}

Answer 4

我根据其他答案编写了一个扩展，以便在Swift中更容易使用：

extension UINavigationBar {

    func setBottomBorderColor(color: UIColor) {

        let navigationSeparator = UIView(frame: CGRectMake(0, self.frame.size.height - 0.5, self.frame.size.width, 0.5))
        navigationSeparator.backgroundColor = color
        navigationSeparator.opaque = true
        navigationSeparator.tag = 123
        if let oldView = self.viewWithTag(123) {
            oldView.removeFromSuperview()
        }
        self.addSubview(navigationSeparator)

    }
}

您可以在以下上下文中调用方法来使用此扩展名：

self.navigationController?.navigationBar.setBottomBorderColor(UIColor.whiteColor())

我发现这非常有用，因为我必须处理那个彩色边框问题。

Answer 5

根据@sash的回答，我使用Autolayout在Swift中进行了扩展，解释right here。

实质上，其他解决方案存在以下缺陷：

• 如果使用UIImage解决方案
，则无法添加阴影
• 添加的子视图在视图旋转时不会调整大小

extension UINavigationBar {

  func setBottomBorderColor(color: UIColor, height: CGFloat) -> UIView {

    let bottomBorderView = UIView(frame: CGRectZero)
    bottomBorderView.translatesAutoresizingMaskIntoConstraints = false
    bottomBorderView.backgroundColor = color

    self.addSubview(bottomBorderView)

    let views = ["border": bottomBorderView]
    self.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[border]|", options: [], metrics: nil, views: views))
    self.addConstraint(NSLayoutConstraint(item: bottomBorderView, attribute: .Height, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1.0, constant: height))
    self.addConstraint(NSLayoutConstraint(item: bottomBorderView, attribute: .Bottom, relatedBy: .Equal, toItem: self, attribute: .Bottom, multiplier: 1.0, constant: height))    

    return bottomBorderView
  }
}

如果需要，这样你仍然可以添加阴影，这可以很好地处理旋转！

Answer 6

我使用autolayouts解决了这个问题。该解决方案适用于不同的屏幕尺寸和方向变化。

extension UINavigationBar {

    @IBInspectable var bottomBorderColor: UIColor {
        get {
            return self.bottomBorderColor;
        }
        set {
            let bottomBorderRect = CGRect.zero;
            let bottomBorderView = UIView(frame: bottomBorderRect);
            bottomBorderView.backgroundColor = newValue;
            addSubview(bottomBorderView);

            bottomBorderView.translatesAutoresizingMaskIntoConstraints = false;

            self.addConstraint(NSLayoutConstraint(item: bottomBorderView, attribute: .trailing, relatedBy: .equal, toItem: self, attribute: .trailing, multiplier: 1, constant: 0));
            self.addConstraint(NSLayoutConstraint(item: bottomBorderView, attribute: .leading, relatedBy: .equal, toItem: self, attribute: .leading, multiplier: 1, constant: 0));
            self.addConstraint(NSLayoutConstraint(item: bottomBorderView, attribute: .top, relatedBy: .equal, toItem: self, attribute: .bottom, multiplier: 1, constant: 0));
            self.addConstraint(NSLayoutConstraint(item: bottomBorderView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute,multiplier: 1, constant: 1));
        }

    }

}

Answer 7

如果您喜欢像我这样的简单和hacky解决方案，请创建一个涵盖默认边框的视图：

UIView *navBarLineView = [[UIView alloc] initWithFrame:CGRectMake(0, CGRectGetHeight(self.navigationController.navigationBar.frame),
                                                                  CGRectGetWidth(self.navigationController.navigationBar.frame), 1)];
navBarLineView.backgroundColor = [UIColor redColor];
[self.navigationController.navigationBar addSubview:navBarLineView];

Answer 8

好吧，如果你想删除底部边框，你可以将阴影图像设置为空图像

[navigationBar setShadowImage:[UIImage new]];

因此，如果您想将其设置为其他颜色，只需使用该颜色创建图像，我使用辅助函数从下面的颜色创建图像（原始来源http://jslim.net/blog/2014/05/05/ios-customize-uitabbar-appearance/）

+ (UIImage *)imageFromColor:(UIColor *)color forSize:(CGSize)size 
{
return [UIImage imageFromColor:color forSize:size withCornerRadius:0];
}

+ (UIImage *)imageFromColor:(UIColor *)color forSize:(CGSize)size     withCornerRadius:(CGFloat)radius
{
CGRect rect = CGRectMake(0, 0, size.width, size.height);
UIGraphicsBeginImageContext(rect.size);

CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

// Begin a new image that will be the new image with the rounded corners
// (here with the size of an UIImageView)
UIGraphicsBeginImageContext(size);

// Add a clip before drawing anything, in the shape of an rounded rect
[[UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radius] addClip];
// Draw your image
[image drawInRect:rect];

// Get the image, here setting the UIImageView image
image = UIGraphicsGetImageFromCurrentImageContext();

// Lets forget about that we were drawing
UIGraphicsEndImageContext();

return image;
}

并在我的导航栏中

[navigationBar setShadowImage:[UIImage imageFromColor:[UIColor redColor] forSize:CGSizeMake(CGRectGetWidth(self.tableView.frame), 1)]];

它，它为我工作，希望得到这个帮助。请考虑更改已接受的答案，因为它不起作用并且可能令人困惑

Answer 9

budidino 解决方案非常有效。这是Swift：

let navBarLineView = UIView(frame: CGRectMake(0,
    CGRectGetHeight((navigationController?.navigationBar.frame)!),
    CGRectGetWidth((self.navigationController?.navigationBar.frame)!),
    1))

navBarLineView.backgroundColor = UIColor.whiteColor()

navigationController?.navigationBar.addSubview(navBarLineView)

Answer 10

要构建@sash的Swift实现，您可以使用约束使边框响应旋转/特征更改：

extension UINavigationBar {
  func setBottomBorderColor(color: UIColor, height: CGFloat) {

    let bottomBorderView = UIView()
    bottomBorderView.backgroundColor = color
    bottomBorderView.translatesAutoresizingMaskIntoConstraints = false
    addSubview(bottomBorderView)

    // Add constraints to make the bar always stay at the bottom of the nav bar and change size with rotation/trait changes
    let horizontalConstraint = NSLayoutConstraint(item: bottomBorderView, attribute: NSLayoutAttribute.centerX, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.centerX, multiplier: 1, constant: 0)
    let verticalConstraint = NSLayoutConstraint(item: bottomBorderView, attribute: NSLayoutAttribute.centerY, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: NSLayoutAttribute.bottom, multiplier: 1, constant: 0)
    let widthConstraint = NSLayoutConstraint(item: bottomBorderView, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: self, attribute: .width, multiplier: 1, constant: 0)
    let heightConstraint = NSLayoutConstraint(item: bottomBorderView, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1, constant: height)

    self.addConstraints([horizontalConstraint, verticalConstraint, widthConstraint, heightConstraint])
  }
}

Answer 11

以下是使用清晰颜色创建图像的方法：

+ (UIImage*)imageFromColor:(UIColor *)color withSize:(CGSize)sizeImage
{
    UIImage *resultImage = nil;

    UIGraphicsBeginImageContext(sizeImage);

    CGContextSetFillColorWithColor(UIGraphicsGetCurrentContext(), color.CGColor);
    CGContextFillRect(UIGraphicsGetCurrentContext(), CGRectMake(0.0f, 0.0f, sizeImage.width, sizeImage.height));
    resultImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return resultImage;
}

这是删除恼人的底线的用法：

navigationBar.shadowImage = [UIImage imageFromColor:[UIColor clearColor] withSize:CGSizeMake(1.0f, 1.0f)];

Answer 12

Picture 1

你可以使用Reveal来查看边框颜色是UIImageView的backgroundColor。 所以直接修改imageView的backgroundColor或隐藏它。

代码：我写在@interface QdtTabBarController：UITabBarController

    var inDate= document.getElementById("InputDate").value;
    var dt = new Date(Date.parse(inDate));  //use parse input to corret date format
    dt.setFullYear(dt.getFullYear() - 3);

Picture 2

Answer 13

我正在使用RubyMotion和RedPotion gem，其中包含一个StandardAppearance类。这就是我做的！

将此行放在app_delegate.rb的顶部，就在on_load方法之前：

ApplicationStylesheet.new(nil).application_setup

然后，在application_stylesheet.rb中，将其作为application_setup方法的最后一行：

StandardAppearance.apply app.window

然后这是我的StandardAppearance课程：

class StandardAppearance
  def self.apply(window)
    Dispatch.once do

      UINavigationBar.appearance.tap do |o|
        o.setBackgroundImage(UIImage.alloc.init, forBarMetrics: UIBarMetricsDefault)
        o.shadowImage = UIImage.alloc.init
      end

    end
  end
end

Answer 14

这将有助于您：）

[self.navigationController.navigationBar.layer setBorderWidth:2.0];// Just to make sure its working
[self.navigationController.navigationBar.layer setBorderColor:[[UIColor redColor] CGColor]];