NSTextField成为FirstFirstResponder在awakeFromNib中不起作用

Question

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

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

 BOOL retVal = [super becomeFirstResponder];

 // do your stuff
 return retVal;
}