PROSAGA码农传奇-swift/objective-C-从库中更改UIBarButton图像

0# Fire ming | 2019-08-31 10-32

<div class =“post-text”itemprop =“text”>
  
    的
      这是工作代码（swift 4）
    </强>
  
   <pre>
 <code>
 override func viewDidLoad() {

let containView = UIView(frame: CGRect(x: 0, y: 0, width: 35, height: 35))

let Button : UIButton = UIButton.init(type: .custom)
    Button.frame = CGRect(x: 0, y: 0, width: 35, height: 35)
    Button.Round = true
    Button.setImage(UIImage(named: "photoIcon"), for: .normal)
    Button.addTarget(self, action: #selector(btnTapped), for: .touchUpInside)   
    containView.addSubview(Button)
    let rightBarButton = UIBarButtonItem(customView: containView)
    self.navigationItem.rightBarButtonItem = rightBarButton
}

</code>
 </pre>
  
    的
      按钮动作在这里
    </强>
  
   <pre>
 <code>
 @objc func btnTapped(_ sender: Any) {
 print("Click Event")
}

</code>
 </pre>
  
    圆形扩展
  
   <pre>
 <code>
 extension UIView{

@IBInspectable var Round:Bool{
        get{
            return false
        }
        set{
            if newValue == true {
                self.layer.cornerRadius = self.frame.size.height/2;
                self.layer.masksToBounds = true;
            }

}
    }
}

</code>
 </pre>
  
    的
      输出：
    </强>
  
  
    <a href="https://i.stack.imgur.com/dMGyf.png" rel="nofollow noreferrer">
      <img src =“https://i.stack.imgur.com/dMGyf.png”alt =“在此处输入图片说明”/>
    </A>
  
</DIV>

1# 银角 | 2019-08-31 10-32

<div class =“post-text”itemprop =“text”>
  
    据我了解你的问题。我找到了解决方案。
  
  
    的
      试试这个
    </强>
  
   <pre>
 <code>
 func createPhotoBarButton(image: Data) {
 let barbtn = UIBarButtonItem()

let imageView = UIImageView(frame: CGRect(x: 0.0, y: 0.0, width: 35.0, height: 35.0))

var image = UIImage(data:image)
        if image == nil {
            image = UIImage(named: "photoIcon")?.resize(maxWidthHeight: Double(imageView.frame.size.width))
        }

imageView.image = image
        imageView.contentMode = .scaleAspectFill
        imageView.layer.cornerRadius = imageView.frame.size.height / 2
        imageView.layer.masksToBounds = true
        imageView.clipsToBounds = true

self.navigationItem.rightBarButtonItem = barbtn

barbtn.customView = imageView
        barbtn.customView?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(photoTapped(_:))))
}

</code>
 </pre>
  
    的
      调整大小的方法
    </强>
  
   <pre>
 <code>
 extension UIImage {

func resize(maxWidthHeight : Double)-> UIImage? {

let actualHeight = Double(size.height)
        let actualWidth = Double(size.width)
        var maxWidth = 0.0
        var maxHeight = 0.0

if actualWidth > actualHeight {
            maxWidth = maxWidthHeight
            let per = (100.0 * maxWidthHeight / actualWidth)
            maxHeight = (actualHeight * per) / 100.0
        }else{
            maxHeight = maxWidthHeight
            let per = (100.0 * maxWidthHeight / actualHeight)
            maxWidth = (actualWidth * per) / 100.0
        }

let hasAlpha = true
        let scale: CGFloat = 0.0

UIGraphicsBeginImageContextWithOptions(CGSize(width: maxWidth, height: maxHeight), !hasAlpha, scale)
        self.draw(in: CGRect(origin: .zero, size: CGSize(width: maxWidth, height: maxHeight)))

let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
        return scaledImage
    }

}

</code>
 </pre>
  
    的
      产量
    </强>
  
  
    <a href="https://i.stack.imgur.com/aUFLI.png" rel="nofollow noreferrer">
      <img src =“https://i.stack.imgur.com/aUFLI.png”alt =“在此处输入图片说明”/>
    </A>
  
</DIV>

2# 谦逊的毛巾 | 2019-08-31 10-32