我希望创建一个类似于附图中的导航栏。
导航栏的标题将由图像和文本组合而成。
是否应该按最佳实践来处理?
如何处理呢?
我希望创建一个类似于附图中的导航栏。
导航栏的标题将由图像和文本组合而成。
是否应该按最佳实践来处理?
如何处理呢?
正如这个答案所示,最简单的解决方案是将文本添加到您的图像中,并将该图像添加到导航栏中,如下所示:
var image = UIImage(named: "logo.png")
self.navigationItem.titleView = UIImageView(image: image)
但是如果你需要分别添加文本和图像(例如在本地化的情况下),你可以将导航栏的标题视图设置为包含图像和文本的UIView
,并将它们添加到其中,然后将navigationItem
的标题视图设置为该UIView
,例如(假设导航栏是导航控制器的一部分):
// Only execute the code if there's a navigation controller
if self.navigationController == nil {
return
}
// Create a navView to add to the navigation bar
let navView = UIView()
// Create the label
let label = UILabel()
label.text = "Text"
label.sizeToFit()
label.center = navView.center
label.textAlignment = NSTextAlignment.Center
// Create the image view
let image = UIImageView()
image.image = UIImage(named: "Image.png")
// To maintain the image's aspect ratio:
let imageAspect = image.image!.size.width/image.image!.size.height
// Setting the image frame so that it's immediately before the text:
image.frame = CGRect(x: label.frame.origin.x-label.frame.size.height*imageAspect, y: label.frame.origin.y, width: label.frame.size.height*imageAspect, height: label.frame.size.height)
image.contentMode = UIViewContentMode.ScaleAspectFit
// Add both the label and image view to the navView
navView.addSubview(label)
navView.addSubview(image)
// Set the navigation bar's navigation item's titleView to the navView
self.navigationItem.titleView = navView
// Set the navView's frame to fit within the titleView
navView.sizeToFit()
使用水平的 UIStackView
应该会更加简洁和易于操作。
请将下面的扩展添加到 UIViewController
中。
extension UIViewController {
func setTitle(_ title: String, andImage image: UIImage) {
let titleLbl = UILabel()
titleLbl.text = title
titleLbl.textColor = UIColor.white
titleLbl.font = UIFont.systemFont(ofSize: 20.0, weight: .bold)
let imageView = UIImageView(image: image)
let titleView = UIStackView(arrangedSubviews: [imageView, titleLbl])
titleView.axis = .horizontal
titleView.spacing = 10.0
navigationItem.titleView = titleView
}
}
然后在您的视图控制器中使用它:
setTitle("yourTitle", andImage: UIImage(named: "yourImage"))
(如果您想将文本和图标一起居中对齐,请执行此操作。如果您希望文本居中对齐并将图标放置在左侧,则只需添加一个宽度约束等于图标宽度的空UIView
)
这是我对Swift 4的建议,因为被接受的答案对我没有用(大部分内容都在屏幕外):
// .. in ViewController
var navBar = CustomTitleView()
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// =================== navBar =====================
navBar.loadWith(title: "Budget Overview", leftImage: Images.pie_chart)
self.navigationItem.titleView = navBar
}
class CustomTitleView: UIView
{
var title_label = CustomLabel()
var left_imageView = UIImageView()
override init(frame: CGRect){
super.init(frame: frame)
setup()
}
required init?(coder aDecoder: NSCoder){
super.init(coder: aDecoder)
setup()
}
func setup(){
self.addSubview(title_label)
self.addSubview(left_imageView)
}
func loadWith(title: String, leftImage: UIImage?)
{
//self.backgroundColor = .yellow
// =================== title_label ==================
//title_label.backgroundColor = .blue
title_label.text = title
title_label.font = UIFont.systemFont(ofSize: FontManager.fontSize + 5)
// =================== imageView ===================
left_imageView.image = leftImage
setupFrames()
}
func setupFrames()
{
let height: CGFloat = Navigation.topViewController()?.navigationController?.navigationBar.frame.height ?? 44
let image_size: CGFloat = height * 0.8
left_imageView.frame = CGRect(x: 0,
y: (height - image_size) / 2,
width: (left_imageView.image == nil) ? 0 : image_size,
height: image_size)
let titleWidth: CGFloat = title_label.intrinsicContentSize.width + 10
title_label.frame = CGRect(x: left_imageView.frame.maxX + 5,
y: 0,
width: titleWidth,
height: height)
contentWidth = Int(left_imageView.frame.width)
self.frame = CGRect(x: 0, y: 0, width: CGFloat(contentWidth), height: height)
}
var contentWidth: Int = 0 //if its CGFloat, it infinitely calls layoutSubviews(), changing franction of a width
override func layoutSubviews() {
super.layoutSubviews()
self.frame.size.width = CGFloat(contentWidth)
}
}
Swift 4.2 + Interface Builder 解决方案
作为对Lyndsey Scott的回答的跟进,您还可以在Interface Builder中创建一个UIView
.xib,使用它来布置标题和图像,然后通过@IBOutlet
实时更新它。这对于动态内容、国际化、可维护性等方面非常有用。
UILabel
outlet 的 UIView
子类,并将您的新 .xib 分配给此类:import UIKit
class FolderTitleView: UIView {
@IBOutlet weak var title : UILabel!
/// Create an instance of the class from its .xib
class func instanceFromNib() -> FolderTitleView {
return UINib(nibName: "FolderTitleView", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! FolderTitleView
}
}
将标签(例如我的示例中的title
)连接到您的.xib文件中的插座,然后在UIViewController
中执行以下操作:
/// Reference to the title view
var folderTitleView : FolderTitleView?
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Set the screen title to match the active folder
updateTitle()
}
/// Updates the title of the navigation controller.
func updateTitle() {
self.title = ""
if folderTitleView == nil {
folderTitleView = FolderTitleView.instanceFromNib()
self.navigationItem.titleView = folderTitleView
}
folderTitleView!.title.text = "Listening"
folderTitleView!.layoutIfNeeded()
}
// 对我有用
在将图像和标签添加到视图后,将相同的视图添加到navigationItem中
let navigationView = UIView(frame: CGRect(x: 0, y: 0, width: 50, height: 55))
let labell: UILabel = UILabel(frame: CGRect(x: -38, y: 25, width: 150, height: 25))
labell.text = "你的文本"
labell.textColor = UIColor.black
labell.font = UIFont.boldSystemFont(ofSize: 10)
navigationView.addSubview(labell)
let image: UIImage = UIImage(named: ValidationMessage.headerLogoName)!
let imageView = UIImageView(frame: CGRect(x: -20, y: 0, width: 100, height: 30))
imageView.contentMode = .scaleAspectFit
imageView.image = image
//navigationItem.titleView = imageView
navigationView.addSubview(imageView)
navigationItem.titleView = navigationView