Fix NavigationBar title too long

Demo/Demo/ViewController.swift

@@ -23,12 +23,18 @@ class ViewController: UIViewController {
 
         // "Old" version
         // menuView = BTNavigationDropdownMenu(navigationController: self.navigationController, containerView: self.navigationController!.view, title: "Dropdown Menu", items: items)
+
+
 
         menuView = BTNavigationDropdownMenu(navigationController: self.navigationController, containerView: self.navigationController!.view, title: BTTitle.index(2), items: items)
 
         // Another way to initialize:
         // menuView = BTNavigationDropdownMenu(navigationController: self.navigationController, containerView: self.navigationController!.view, title: BTTitle.title("Dropdown Menu"), items: items)
-
+
+        let maxString = String(repeating: "一", count: 11)
+        let maxTitleSize = (maxString as NSString).size(withAttributes: [NSAttributedString.Key.font:menuView.navigationBarTitleFont])
+        menuView.menuTitleMaxWidth = maxTitleSize.width
+        menuView.menuTitleBreakModel = .byTruncatingMiddle
         menuView.cellHeight = 50
         menuView.cellBackgroundColor = self.navigationController?.navigationBar.barTintColor
         menuView.cellSelectionColor = UIColor(red: 0.0/255.0, green:160.0/255.0, blue:195.0/255.0, alpha: 1.0)

Source/BTNavigationDropdownMenu.swift

@@ -38,6 +38,25 @@ open class BTNavigationDropdownMenu: UIView {
             self.configuration.menuTitleColor = value
         }
     }
+
+    open var menuTitleMaxWidth: CGFloat? {
+        get {
+            return self.configuration.menuTitleMaxWidth
+        }
+        set(value) {
+            self.configuration.menuTitleMaxWidth = value
+        }
+    }
+
+    open var menuTitleBreakModel: NSLineBreakMode {
+        get {
+            return self.configuration.menuTitleBreakModel
+        }
+        set(value) {
+            self.configuration.menuTitleBreakModel = value
+        }
+    }
+
 
     // The height of the cell. Default is 50
     open var cellHeight: NSNumber {
@@ -314,6 +333,7 @@ open class BTNavigationDropdownMenu: UIView {
         self.menuTitle.textColor = self.menuTitleColor
         self.menuTitle.font = self.configuration.navigationBarTitleFont
         self.menuTitle.textAlignment = self.configuration.cellTextLabelAlignment
+        self.menuTitle.lineBreakMode = self.configuration.menuTitleBreakModel
         self.menuButton.addSubview(self.menuTitle)
 
         self.menuArrow = UIImageView(image: self.configuration.arrowImage.withRenderingMode(.alwaysTemplate))
@@ -377,7 +397,16 @@ open class BTNavigationDropdownMenu: UIView {
     }
 
     override open func layoutSubviews() {
-        self.menuTitle.sizeToFit()
+        let fitsSize = self.menuTitle.sizeThatFits(CGSize.zero)
+        var menuWidth = fitsSize.width
+        if let menuTitleMaxWidth = self.menuTitleMaxWidth {
+            menuWidth = CGFloat.minimum(fitsSize.width, menuTitleMaxWidth)
+            let menuSize = CGSize(width: menuWidth, height: fitsSize.height)
+            self.menuTitle.frame.size.height = menuSize.height
+            self.menuTitle.frame.size.width = menuSize.width
+        } else {
+            self.menuTitle.sizeToFit()
+        }
         self.menuTitle.center = CGPoint(x: self.frame.size.width/2, y: self.frame.size.height/2)
         self.menuTitle.textColor = self.configuration.menuTitleColor
         self.menuArrow.sizeToFit()

Source/Internal/BTConfiguration.swift

@@ -25,6 +25,8 @@ import UIKit
 
 final class BTConfiguration {
     var menuTitleColor: UIColor?
+    var menuTitleMaxWidth: CGFloat?
+    var menuTitleBreakModel : NSLineBreakMode!
     var cellHeight: CGFloat!
     var cellBackgroundColor: UIColor?
     var cellSeparatorColor: UIColor?
@@ -58,6 +60,7 @@ final class BTConfiguration {
 
         // Default values
         self.menuTitleColor = UIColor.darkGray
+        self.menuTitleBreakModel = .byTruncatingMiddle
         self.cellHeight = 50
         self.cellBackgroundColor = UIColor.white
         self.arrowTintColor = UIColor.white