Swift中如何禁用SkyFloatingLabelTextField的复制粘贴功能？

SkyFloatingLabelTextField继承自UITextField，可通过重写canPerformAction:withSender:方法禁用指定的交互操作，具体实现如下：

• 自定义子类继承SkyFloatingLabelTextField（适合需要复用的场景，逻辑清晰无全局污染）
  Swift实现代码：

  class CustomFloatingTextField: SkyFloatingLabelTextField {
      override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
          // 按需添加需要禁用的操作
          let disabledActions = [
              #selector(UIResponderStandardEditActions.copy(_:)),
              #selector(UIResponderStandardEditActions.paste(_:)),
              #selector(UIResponderStandardEditActions.cut(_:)),
              #selector(UIResponderStandardEditActions.select(_:)),
              #selector(UIResponderStandardEditActions.selectAll(_:))
          ]
          if disabledActions.contains(action) {
              return false
          }
          return super.canPerformAction(action, withSender: sender)
      }
  }
  

  Objective-C实现代码：

  // CustomFloatingTextField.h 文件
  @interface CustomFloatingTextField : SkyFloatingLabelTextField
  @end
  
  // CustomFloatingTextField.m 文件
  @implementation CustomFloatingTextField
  - (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
      NSArray *disabledActions = @[
          NSStringFromSelector(@selector(copy:)),
          NSStringFromSelector(@selector(paste:)),
          NSStringFromSelector(@selector(cut:)),
          NSStringFromSelector(@selector(select:)),
          NSStringFromSelector(@selector(selectAll:))
      ];
      if ([disabledActions containsObject:NSStringFromSelector(action)]) {
          return NO;
      }
      return [super canPerformAction:action withSender:sender];
  }
  @end
  

• 后续使用时，直接替换原有SkyFloatingLabelTextField的类为自定义的CustomFloatingTextField即可生效。如果仅需要禁用部分操作，调整disabledActions数组中的选择器条目即可。

内容的提问来源于stack exchange，提问作者Manish Kumar