iOS 11导航栏高度自定义

Question

现在在iOS 11中,sizeThatFits不从UINavigationBar子类调用该方法.更改UINavigationBar导致故障和错误插入的框架.那么,现在如何定制导航栏高度的任何想法？

Answer 1

根据Apple开发人员(在此处,此处和此处),不支持更改iOS 11中的导航栏高度.在这里,他们建议做一些变通办法,例如在导航栏下面(但在其外面),然后删除导航栏边框.因此,您将在故事板中拥有此内容:

在设备上看起来像这样:

现在你可以做到这一点在其他答案提出了一个解决办法:创建一个自定义子类UINavigationBar,定制大子视图添加到它,覆盖sizeThatFits和layoutSubviews,然后设置additionalSafeAreaInsets.top为导航的顶级控制器的差异customHeight - 44px,但酒吧视图仍将是默认44px,即使在视觉上一切都会看起来很完美.我没有尝试覆盖setFrame,也许它有效,但是,正如Apple开发人员在上面的一个链接中所写:"......并且[支持]都没有改变UINavigationController拥有的导航栏的框架(导航)只要它认为合适,控制器就会愉快地踩踏你的框架变化.)

在我的情况下,上面的解决方法使视图看起来像这样(调试视图显示边框):

正如您所看到的,视觉外观相当不错,additionalSafeAreaInsets正确推送内容,大导航栏可见,但是我在此栏中有一个自定义按钮,只有标准44​​像素导航栏下面的区域是可点击的(图中的绿色区域).标准导航栏高度以下的触摸不会到达我的自定义子视图,因此我需要调整导航栏本身的大小,Apple开发人员说不支持.

Answer 2

2018年1月7日更新

此代码支持XCode 9.2,iOS 11.2

我有同样的问题.以下是我的解决方案.我假设身高是66.

如果有帮助,请选择我的答案.

创建CINavgationBar.swift

   import UIKit

@IBDesignable
class CINavigationBar: UINavigationBar {

    //set NavigationBar's height
    @IBInspectable var customHeight : CGFloat = 66

    override func sizeThatFits(_ size: CGSize) -> CGSize {

        return CGSize(width: UIScreen.main.bounds.width, height: customHeight)

    }

    override func layoutSubviews() {
        super.layoutSubviews()

        print("It called")

        self.tintColor = .black
        self.backgroundColor = .red



        for subview in self.subviews {
            var stringFromClass = NSStringFromClass(subview.classForCoder)
            if stringFromClass.contains("UIBarBackground") {

                subview.frame = CGRect(x: 0, y: 0, width: self.frame.width, height: customHeight)

                subview.backgroundColor = .green
                subview.sizeToFit()
            }

            stringFromClass = NSStringFromClass(subview.classForCoder)

            //Can't set height of the UINavigationBarContentView
            if stringFromClass.contains("UINavigationBarContentView") {

                //Set Center Y
                let centerY = (customHeight - subview.frame.height) / 2.0
                subview.frame = CGRect(x: 0, y: centerY, width: self.frame.width, height: subview.frame.height)
                subview.backgroundColor = .yellow
                subview.sizeToFit()

            }
        }


    }


}

设置故事板

设置自定义NavigationBar类

添加TestView + Set SafeArea

ViewController.swift

import UIKit

class ViewController: UIViewController {

    var navbar : UINavigationBar!

    @IBOutlet weak var testView: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()

        //update NavigationBar's frame
        self.navigationController?.navigationBar.sizeToFit()
        print("NavigationBar Frame : \(String(describing: self.navigationController!.navigationBar.frame))")

    }

    //Hide Statusbar
    override var prefersStatusBarHidden: Bool {

        return true
    }

    override func viewDidAppear(_ animated: Bool) {

        super.viewDidAppear(false)

        //Important!
        if #available(iOS 11.0, *) {

            //Default NavigationBar Height is 44. Custom NavigationBar Height is 66. So We should set additionalSafeAreaInsets to 66-44 = 22
            self.additionalSafeAreaInsets.top = 22

        }

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

SecondViewController.swift

import UIKit

class SecondViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.


        // Create BackButton
        var backButton: UIBarButtonItem!
        let backImage = imageFromText("Back", font: UIFont.systemFont(ofSize: 16), maxWidth: 1000, color:UIColor.white)
        backButton = UIBarButtonItem(image: backImage, style: UIBarButtonItemStyle.plain, target: self, action: #selector(SecondViewController.back(_:)))

        self.navigationItem.leftBarButtonItem = backButton
        self.navigationItem.leftBarButtonItem?.setBackgroundVerticalPositionAdjustment(-10, for: UIBarMetrics.default)


    }
    override var prefersStatusBarHidden: Bool {

        return true
    }
    @objc func back(_ sender: UITabBarItem){

        self.navigationController?.popViewController(animated: true)

    }


    //Helper Function : Get String CGSize
    func sizeOfAttributeString(_ str: NSAttributedString, maxWidth: CGFloat) -> CGSize {
        let size = str.boundingRect(with: CGSize(width: maxWidth, height: 1000), options:(NSStringDrawingOptions.usesLineFragmentOrigin), context:nil).size
        return size
    }


    //Helper Function : Convert String to UIImage
    func imageFromText(_ text:NSString, font:UIFont, maxWidth:CGFloat, color:UIColor) -> UIImage
    {
        let paragraph = NSMutableParagraphStyle()
        paragraph.lineBreakMode = NSLineBreakMode.byWordWrapping
        paragraph.alignment = .center // potentially this can be an input param too, but i guess in most use cases we want center align

        let attributedString = NSAttributedString(string: text as String, attributes: [NSAttributedStringKey.font: font, NSAttributedStringKey.foregroundColor: color, NSAttributedStringKey.paragraphStyle:paragraph])

        let size = sizeOfAttributeString(attributedString, maxWidth: maxWidth)
        UIGraphicsBeginImageContextWithOptions(size, false , 0.0)
        attributedString.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image!
    }




    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }



}

黄色是barbackgroundView.黑色不透明度是BarContentView.

我删除了BarContentView的backgroundColor.

而已.

Answer 3

补充:问题在iOS 11 beta 6中得到解决,因此下面的代码没用^ _ ^

原始答案:

解决了以下代码:

(我总是希望navigationBar.height + statusBar.height == 64 statusBar的隐藏是否为true)

 @implementation P1AlwaysBigNavigationBar

- (CGSize)sizeThatFits:(CGSize)size {
    CGSize sizeThatFit = [super sizeThatFits:size];
    if ([UIApplication sharedApplication].isStatusBarHidden) {
        if (sizeThatFit.height < 64.f) {
            sizeThatFit.height = 64.f;
        }
    }
    return sizeThatFit;
}

- (void)setFrame:(CGRect)frame {
    if ([UIApplication sharedApplication].isStatusBarHidden) {
        frame.size.height = 64;
    }
    [super setFrame:frame];
}

- (void)layoutSubviews
{
    [super layoutSubviews];

    if (![UIApplication sharedApplication].isStatusBarHidden) {
        return;
    }

    for (UIView *subview in self.subviews) {
        NSString* subViewClassName = NSStringFromClass([subview class]);
        if ([subViewClassName containsString:@"UIBarBackground"]) {
            subview.frame = self.bounds;
        }else if ([subViewClassName containsString:@"UINavigationBarContentView"]) {
            if (subview.height < 64) {
                subview.y = 64 - subview.height;
            }else {
                subview.y = 0;
            }
        }
    }
}
@end

Answer 4

这对我有用:

- (CGSize)sizeThatFits:(CGSize)size {
    CGSize sizeThatFit = [super sizeThatFits:size];
    if ([UIApplication sharedApplication].isStatusBarHidden) {
        if (sizeThatFit.height < 64.f) {
            sizeThatFit.height = 64.f;
        }
    }
    return sizeThatFit;
}

- (void)setFrame:(CGRect)frame {
    if ([UIApplication sharedApplication].isStatusBarHidden) {
        frame.size.height = 64;
    }
    [super setFrame:frame];
}

- (void)layoutSubviews
{
    [super layoutSubviews];

    for (UIView *subview in self.subviews) {
        if ([NSStringFromClass([subview class]) containsString:@"BarBackground"]) {
            CGRect subViewFrame = subview.frame;
            subViewFrame.origin.y = 0;
            subViewFrame.size.height = 64;
            [subview setFrame: subViewFrame];
        }
        if ([NSStringFromClass([subview class]) containsString:@"BarContentView"]) {
            CGRect subViewFrame = subview.frame;
            subViewFrame.origin.y = 20;
            subViewFrame.size.height = 44;
            [subview setFrame: subViewFrame];
        }
    }
}

Answer 5

除了覆盖-layoutSubviews，如果您不希望调整大小的导航栏隐藏您的内容，-setFrame:您应该查看新添加的 UIViewController 的additionalSafereaInsets属性（Apple 文档）。

Answer 6

使用Swift 4进行了简化。

class CustomNavigationBar : UINavigationBar {

    private let hiddenStatusBar: Bool

    // MARK: Init
    init(hiddenStatusBar: Bool = false) {
        self.hiddenStatusBar = hiddenStatusBar
        super.init(frame: .zero)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    // MARK: Overrides
    override func layoutSubviews() {
        super.layoutSubviews()

        if #available(iOS 11.0, *) {
            for subview in self.subviews {
                let stringFromClass = NSStringFromClass(subview.classForCoder)
                if stringFromClass.contains("BarBackground") {
                    subview.frame = self.bounds
                } else if stringFromClass.contains("BarContentView") {
                    let statusBarHeight = self.hiddenStatusBar ? 0 : UIApplication.shared.statusBarFrame.height
                    subview.frame.origin.y = statusBarHeight
                    subview.frame.size.height = self.bounds.height - statusBarHeight
                }
            }
        }
    }
}

Answer 7

虽然它在 beta 4 中得到了修复，但导航栏的背景图像似乎并未随实际视图缩放（您可以通过在视图层次结构查看器中查看来验证这一点）。layoutSubviews目前的解决方法是在您的自定义中覆盖UINavigationBar，然后使用以下代码：

- (void)layoutSubviews
{
  [super layoutSubviews];

  for (UIView *subview in self.subviews) {
    if ([NSStringFromClass([subview class]) containsString:@"BarBackground"]) {
        CGRect subViewFrame = subview.frame;
        subViewFrame.origin.y = -20;
        subViewFrame.size.height = CUSTOM_FIXED_HEIGHT+20;
        [subview setFrame: subViewFrame];
    }
  }
}

如果您注意到，栏背景实际上有一个偏移量，-20使其出现在状态栏后面，因此上面的计算将其添加进来。