Question

在我的项目中，我有一个带有按钮的导航栏以打开幻灯片菜单。现在，我试图设置标题图像而不是标题字符串。不太可能将图像稍微向右推而不是居中。我之所以认为是因为导航栏左上角的幻灯片菜单按钮。如果我在main.storyboard中设置标题，则一切看起来都正确。为什么会这样，所以我的图像不会居中。

图片功能：

func addNavBarImage() {

    let navController = navigationController!

    let image = UIImage(named: "TransparentLogo")
    let imageView = UIImageView(image: image)

    let bannerWidth = navController.navigationBar.frame.size.width
    let bannerHeight = navController.navigationBar.frame.size.height

    let bannerX = bannerWidth - image!.size.width
    let bannerY = bannerHeight - image!.size.height
    imageView.frame = CGRect(x: bannerX, y: bannerY, width: bannerWidth, height: bannerHeight)
    imageView.contentMode = .scaleAspectFit

    navigationItem.titleView = imageView
}

按钮功能：

func addSlideMenuButton(){
    let btnShowMenu = UIButton(type: UIButton.ButtonType.system)
    btnShowMenu.setImage(self.defaultMenuImage(), for: UIControl.State())
    btnShowMenu.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
    btnShowMenu.addTarget(self, action: #selector(BaseViewController.onSlideMenuButtonPressed(_:)), for: UIControl.Event.touchUpInside)
    btnShowMenu.tintColor = UIColor(red: 3, green: 49, blue: 79)
    let customBarItem = UIBarButtonItem(customView: btnShowMenu)
    self.navigationItem.leftBarButtonItem = customBarItem;

}

Answer 1

在功能addNavBarImage()中像这样更改titleView的框架：-

func addNavBarImage() {

let navController = navigationController!

let image = UIImage(named: "TransparentLogo")
let imageView = UIImageView(image: image)

let bannerWidth = navController.navigationBar.frame.size.width
let bannerHeight = navController.navigationBar.frame.size.height

let bannerX = bannerWidth - image!.size.width
let bannerY = bannerHeight - image!.size.height
imageView.frame = CGRect(x: bannerX, y: bannerY, width: bannerWidth, height: bannerHeight)
imageView.contentMode = .scaleAspectFit

navigationItem.titleView = imageView
}

对此

func addNavBarImage() {
let imageView = UIImageView(image: #imageLiteral(resourceName: "TransparentLogo"))
imageView.frame = CGRect(x: 0, y: 0, width: 170, height: 30)
imageView.contentMode = .scaleAspectFit

let titleView = UIView(frame: CGRect(x: 0, y: 0, width: 170, height: 30))

titleView.addSubview(imageView)
titleView.backgroundColor = .clear
self.navigationItem.titleView = titleView
}

如何居中导航栏图像[快速]

1 个答案: