NSTextField成为FirstFirstResponder在awakeFromNib中不起作用

我想在表单加载时设置焦点，但它在awakeFromNib中不起作用。

[myTextField becomeFirstResponder]; 

Answer 1

只是引用苹果文档 ：

 Use the NSWindow makeFirstResponder: method, not this method, to make an object the first responder. Never invoke this method directly. 

改为：

 [[myTextField window] makeFirstResponder:myTextField]; 

Answer 2

这个问题的Swift版本：

 textField.window?.makeFirstResponder(textField) 

Answer 3

 - (BOOL) becomeFirstResponder { if (someCondition) { return NO; } BOOL retVal = [super becomeFirstResponder]; // do your stuff return retVal; }