ios - 使用 swift 3 在 UINavigationController 中插入右键图像

Question

我试图以编程方式覆盖带有静态图像的导航项的 rightButton 以实现此目的:

以下代码没有给出任何错误，但导航栏中没有显示任何内容。

import UIKit
import Foundation
class UICipNavigationController: UINavigationController {

override func viewDidLoad() {
    super.viewDidLoad()


    // Add BPT LOGO as UIBarButton
    let logoBPT = UIImage(named: "Logo BPT")?.withRenderingMode(.alwaysOriginal)

    let logoBPTBarButton = UIBarButtonItem(image: logoBPT, style: .plain, target: nil, action: nil)
    self.navigationItem.rightBarButtonItem = logoBPTBarButton


}

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

}

.

import UIKit

class UICipNavigationBar: UINavigationBar {

override init(frame: CGRect){
    super.init(frame: frame)

}

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

    self.tintColor = UIColor.white

    self.setBackgroundImage(UIImage.fromColor(color: UIColorFromHex(rgbValue: 0xffffff, alpha: 0.2)), for: UIBarMetrics.default)
    self.shadowImage = UIImage()
    self.isTranslucent = true
    self.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white, NSFontAttributeName: UIFont(name: "Lato-Regular", size: 24)!]

}

override func sizeThatFits(_ size: CGSize) -> CGSize {
    let newSize :CGSize = CGSize(width: self.superview!.bounds.size.width, height: 60)
    return newSize
}

}

我也尝试检查 View ，但似乎没有添加任何内容:

Answer 1

注意: Image name/file/extention 是敏感的。当你设置一个 barButtonImage 时。确保你设置正确。我是评估来自 asset catalog 的图像文件(32pt)。

 let myimage = UIImage(named: "YourImageFileName")?.withRenderingMode(.alwaysOriginal)
 navigationItem.rightBarButtonItem = UIBarButtonItem(image: myimage, style: .plain, target: self, action: #selector(ButtonTapped))


 func ButtonTapped() { 
 print("Button Tapped")  
}

输出: 已更新

方法二:测试目的

注意:将您的标题设置为来自 Xcode 的表情符号图标。运行项目并查看是否有效？

    navigationItem.rightBarButtonItem = UIBarButtonItem(title: "😱", style: .plain, target: self, action: #selector(ButtonTapped))

    func ButtonTapped() { 
    print("Button Tapped")  
   }

输出: