我可以在NSComboBox中轻松添加搜索图标吗？

Question

我想在NSComboBox中显示一个搜索图标作为占位符，就像在搜索框中一样：

通过继承NSComboBox可以轻松完成吗？

Answer 1

我建议您使用NSTextField和NSImageView将NSView子类化。像一个

NSView
 |
 |-NSImageView
 |
 |-NSComboBox

这个班级将是NSTextFieldDelegate - 响应者：

- (void)controlTextDidBeginEditing:(NSNotification *)notification
{
  // change lens image view position (for example with layout constraint constant change animated)
  // change text field horizontal text alignment to Left
}

- (void)controlTextDidEndEditing:(NSNotification *)notification
{
  // change text field horizontal text alignment to center
  // change lens image view position to default
}