I think this came up recently in a slightly different context, but reading that
thread doesn’t help me with my problem here.
I have a series of NSTextFields and I want to automatically move the keyboard
focus to the ‘next’ field when the one preceding it has a certain number of
characters entered. My code is:
- (void) controlTextDidChange:(NSNotification*) obj
{
NSTextField* control = [obj object];
NSString* text = [control stringValue];
if([text length] >= 4 )
{
NSString* shortStr = [[text substringToIndex:4]
uppercaseString];
[control setStringValue:shortStr];
NSResponder* nextField = [control nextKeyView];
NSLog(@"got 4 characters: '%@', moving to field: %@", shortStr,
nextField );
[[self window] makeFirstResponder:nextField];
}
}
This code is in a NSWindowController subclass, and I have set up the
‘nextKeyView’ of each fireld to be the next one along, and I’ve also verified
that these are all set correctly, as is the ‘window’ outlet, so the line
[[self window] makeFirstResponder:nextField];
is called, and does have all valid parameters.
The window controller is set as the delegate of the fields so that it receives
the -controlTextDidChange message as the user types in the fields. This is
definitely called on every keystroke, and the code does what it should,
detecting the string length and calling -makeFirstResponder when it gets a
length of 4 or more (as a side effect it also forces whatever the user has
types to be uppercase but that’s not important here).
The current field does lose focus, but the next field never gains it, so the
flow of text entry from field to field doesn’t occur as it should. Also, even
though the first field is set as the window’s initialFirstResponder, and does
get the keyboard focus ring, the actual field editor isn’t ready and typing
just produces a beep - the user has to click in the field to make it accept
text. These probems may well be related.
I should point out that this did work in the past for some version of the OS,
but it doesn’t work in 10.10 - I don’t know at what version it stopped working.
I’ve tried calling -makeFirstResponder after a delay, but it doesn’t help. I’m
using a custom field editor (NSTextView subclass), but if I disable that so it
uses the standard one, the faulty behaviour doesn’t change.
What’s the currently supported way to programmatically switch among text
fields? Or is it simply broken in the OS at the moment?
—Graham
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