NSTextField becomeFirstResponder在awakeFromNib中不起作用

Question

我想在表單加載時設置焦點，但它在awakeFromNib中不起作用。

[myTextField becomeFirstResponder]; 

Answer 1

- (BOOL) becomeFirstResponder 
{ 
if (someCondition) 
{ 
    return NO; 
} 

BOOL retVal = [super becomeFirstResponder]; 

// do your stuff 
return retVal; 
} 

Answer 2

只是引述apple docs：

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

而是執行此操作：

[[myTextField window] makeFirstResponder:myTextField]; 

Answer 3

雨燕版本這個問題：

textField.window?.makeFirstResponder(textField)