rightBarButtonItem 出现在中间答案

【问题标题】：rightBarButtonItem appearing in the middlerightBarButtonItem 出现在中间
【发布时间】：2019-08-09 18:13:12
【问题描述】：

rightbarbuttonitem 没有出现在导航栏的右侧。我希望导航栏看起来类似于“App Store”中的导航栏

我已经尝试在情节提要和代码中这样做，设置图像内容模式，剪切到边界，并给它一个框架。

我也一直在网上寻找解决方案，但没有一个对我有用。任何帮助或建议将不胜感激，谢谢。

以下是一些截图：

import UIKit


class KYSearchBarController: UISearchController {

    override init(searchResultsController: UIViewController?) {
        super.init(searchResultsController: searchResultsController)
    }

    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)

    }
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    // Call in view did appear
    func CustomizeSearchBar() {
        // Changing color of text in textfield.
        let textfieldInsideBar = self.searchBar.value(forKey: "searchField") as? UITextField
        textfieldInsideBar?.textColor = .darkGray

        // Chaning placeholder
        let textfieldLbl = textfieldInsideBar?.value(forKey: "placeholderLabel") as? UILabel
        textfieldLbl?.textColor = .darkGray
        textfieldLbl?.textAlignment = .center

        // Icon customization
        let glassIcon = textfieldInsideBar?.leftView as? UIImageView
        glassIcon?.image = #imageLiteral(resourceName: "icon")
        glassIcon?.image?.withRenderingMode(.alwaysTemplate)
        glassIcon?.tintColor = .darkGray

        // Centering textfield text
        textfieldInsideBar?.textAlignment = .center

        let clearButton = textfieldInsideBar?.value(forKey: "clearButton") as! UIButton
        clearButton.setImage(UIImage(named: "icon1"), for: .normal)
        clearButton.tintColor = .darkGray
    }
}

extension UIView {
    func MakeRound() {
        self.layer.cornerRadius = self.frame.width / 5.0
    }
}

class ViewController: UIViewController, UISearchBarDelegate {

    let searchController = KYSearchBarController(searchResultsController: nil)

    override func viewDidLoad() {
        super.viewDidLoad()

        navigationItem.searchController = searchController
        navigationItem.hidesSearchBarWhenScrolling = false

        let userimage = UIImageView(image: UIImage(named: "person1"))
        userimage.frame = CGRect(x: 60, y: 0, width: 50, height: 50)
        userimage.clipsToBounds = true
        userimage.layer.masksToBounds = true
        userimage.contentMode = .scaleAspectFit
        userimage.MakeRound()

        let rightBarButton = UIBarButtonItem(customView: userimage)
        navigationItem.rightBarButtonItem = rightBarButton

    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(true)
        searchController.CustomizeSearchBar()
    }

}

【问题讨论】：

您愿意分享当前对此问题的看法吗？
@FaysalAhmed 你是什么意思？这是项目中唯一的视图。默认视图控制器
谢谢，但这也不起作用@FaysalAhmed。

标签： ios swift xcode uinavigationitem

【解决方案1】：

添加userimage 属性使其可在 ViewController 中访问。

class ViewController: UIViewController, UISearchBarDelegate {

   let searchController = KYSearchBarController(searchResultsController: nil)

   let userimage = UIImageView(image: UIImage(named: "person1"))

}

将makeRound() 函数调用添加到viewWillLayoutSubviews()。

    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        userimage.makeRound()
    }

更新 makeRound() 函数以制作圆。

extension UIView {
    func makeRound() {
        self.layer.cornerRadius = self.frame.width / 2.0
    }
}

添加方法以添加必要的约束。

func setupConstraints() {
    navigationItem.searchController = searchController
    navigationItem.hidesSearchBarWhenScrolling = false
    guard let navigationBar = self.navigationController?.navigationBar else { return }
    navigationBar.addSubview(userimage)
    userimage.clipsToBounds = true
    userimage.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
        userimage.rightAnchor.constraint(equalTo: navigationBar.rightAnchor, constant: -16),
        userimage.bottomAnchor.constraint(equalTo: navigationBar.bottomAnchor, constant: -12),
        userimage.heightAnchor.constraint(equalToConstant: 40),
        userimage.widthAnchor.constraint(equalTo: userimage.heightAnchor)
    ])
}

为 UIImageView 设置手势识别器并为其实现。

    func setUpGestureRecognizer() {
        let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(profile))
        userimage.isUserInteractionEnabled = true
        userimage.addGestureRecognizer(tapGestureRecognizer)
    }

    @objc func profile() {
        // Your implementation
    }

使用方法调用更新viewDidLoad()。

    override func viewDidLoad() {
        super.viewDidLoad()
        // Setup constraints
        setupConstraints()
        setUpGestureRecognizer()
    }

【讨论】：

【解决方案2】：

我在为UIBarButtonItem 使用非常大的图像时遇到了同样的问题。

将图片调整为较小尺寸后，它会适当地放置在导航栏的右侧。看来您遇到了同样的问题。

或者，由于从 iOS 11 开始导航栏使用自动布局，替换行

userimage.frame = CGRect(x: 60, y: 0, width: 50, height: 50)

以下也应该可以解决问题：

userimage.widthAnchor.constraint(equalToConstant: 50).isActive = true
userimage.heightAnchor.constraint(equalToConstant: 50).isActive = true

【讨论】：