swift/objective-C 从库中更改UIBarButton图像 返回

从库中更改UIBarButton图像


CTO啊哦
2025-03-15 11:36:40 (5天前)


我有UIBarButton，用户可以更改图像，只需用图像选择器选择照片或图库图像。我的问题是规模图像不好。

如果我使用AspectFit，我的UIBarButton看起来像这样：
如果我用…

4 条回复
  1. 0# Fire ming | 2019-08-31 10-32



    的
    这是工作代码（swift 4）
    </强>



    1.     
            override func viewDidLoad() {
    2. let containView = UIView(frame: CGRect(x: 0, y: 0, width: 35, height: 35))
    4. let Button : UIButton = UIButton.init(type: .custom)
    5. Button.frame = CGRect(x: 0, y: 0, width: 35, height: 35)
    6. Button.Round = true
    7. Button.setImage(UIImage(named: "photoIcon"), for: .normal)
    8. Button.addTarget(self, action: #selector(btnTapped), for: .touchUpInside)   
    9. containView.addSubview(Button)
    10. let rightBarButton = UIBarButtonItem(customView: containView)
    11. self.navigationItem.rightBarButtonItem = rightBarButton
    12. }
    13. </code>
    14.


    的
    按钮动作在这里
    </强>



    1.     
            @objc func btnTapped(_ sender: Any) {
          print(“Click Event”)
      }
    2. </code>
    3.


    圆形扩展



    1.     
            extension UIView{
    2. @IBInspectable var Round:Bool{
    3.     get{
    4.         return false
    5.     }
    6.     set{
    7.         if newValue == true {
    8.             self.layer.cornerRadius = self.frame.size.height/2;
    9.             self.layer.masksToBounds = true;
    10.         }
    12.     }
    13. }
    14. }
    15. </code>
    16.


    的
    输出：
    </强>







  2. 1# 银角 | 2019-08-31 10-32



    据我了解你的问题。我找到了解决方案。



    的
    试试这个
    </强>



    1.     
            func createPhotoBarButton(image: Data) {
              let barbtn = UIBarButtonItem()
    2.     let imageView = UIImageView(frame: CGRect(x: 0.0, y: 0.0, width: 35.0, height: 35.0))
    4.     var image = UIImage(data:image)
    5.     if image == nil {
    6.         image = UIImage(named: "photoIcon")?.resize(maxWidthHeight: Double(imageView.frame.size.width))
    7.     }
    9.     imageView.image = image
    10.     imageView.contentMode = .scaleAspectFill
    11.     imageView.layer.cornerRadius = imageView.frame.size.height / 2
    12.     imageView.layer.masksToBounds = true
    13.     imageView.clipsToBounds = true
    15.     self.navigationItem.rightBarButtonItem = barbtn
    17.     barbtn.customView = imageView
    18.     barbtn.customView?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(photoTapped(_:))))
    19. }
    20. </code>
    21.


    的
    调整大小的方法
    </强>



    1.     
            extension UIImage {
    2. func resize(maxWidthHeight : Double)-> UIImage? {
    4.     let actualHeight = Double(size.height)
    5.     let actualWidth = Double(size.width)
    6.     var maxWidth = 0.0
    7.     var maxHeight = 0.0
    9.     if actualWidth > actualHeight {
    10.         maxWidth = maxWidthHeight
    11.         let per = (100.0 * maxWidthHeight / actualWidth)
    12.         maxHeight = (actualHeight * per) / 100.0
    13.     }else{
    14.         maxHeight = maxWidthHeight
    15.         let per = (100.0 * maxWidthHeight / actualHeight)
    16.         maxWidth = (actualWidth * per) / 100.0
    17.     }
    19.     let hasAlpha = true
    20.     let scale: CGFloat = 0.0
    22.     UIGraphicsBeginImageContextWithOptions(CGSize(width: maxWidth, height: maxHeight), !hasAlpha, scale)
    23.     self.draw(in: CGRect(origin: .zero, size: CGSize(width: maxWidth, height: maxHeight)))
    25.     let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
    26.     return scaledImage
    27. }
    28. }
    29. </code>
    30.


    的
    产量
    </强>







  3. 2# 谦逊的毛巾 | 2019-08-31 10-32



    尝试使用以下代码创建自定义按钮：



    1.     
            func createPhotoBarButton(image: Data) {
          let imageBtnContainer = UIButton()
          let imageBtn = UIButton(frame: CGRect(x: 0, y: 0, width: 30, height: 30))
          var image = UIImage(data:image)
          if image == nil {
              image = UIImage(named: “photoIcon”)
          }
          imageBtn.setImage(image, forState: UIControlState.Normal)
          imageBtn.frame = CGRectMake(0, 0, 53, 31)
          imageBtn.imageView?.contentMode = .scaleAspectFit
    2. imageBtnContainer.addSubview(imageBtn)
    4. self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: imageBtnContainer)
    5. ...
    6. }
    7. </code>
    8.


    你不再需要了

    resizedImage(..)

    功能


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