On 9 May 2008, at 16:59, Simon Wolf wrote:
I have an NSTextField with an associated NSNumberFormatter which I am using to format the values shown to a specific number of decimal places. I have a second NSTextField which I am using to display and edit the number of decimal places that I want shown and I have used the controlTextDidEndEditing delegate method to detect a change. Upon a change I am using the setMinimumFractionDigits and setMaximumFractionDigits methods of the NSNumberFormatter to change the number of decimal places to be shown but I am having trouble getting the NSTextField to refresh without giving the control the focus.If I change the value of the field then the value is displayed correctly:float temp; temp = [netAmountField floatValue]; temp++; [netAmountField setIntValue:(int)temp];If I don't actually change the value then the NSTextField is not refreshed:[netAmountField setFloatValue:[netAmountField floatValue]];I'm fairly sure that this is simply due to the NSTextField being clever enough to realise that the value has not changed and therefore it doesn't re-display the value and trigger the new format and I am equally sure that I'm missing a simple way to achieve the refresh but after an hour of messing around I though I'd ask wiser folk.
I realise that it may be bad form to reply to my own message but I wanted a solution to be stored in the archives for anyone else who is in the early stages of Cocoa and hits the same sort of problem.
As an aside, I removed the Number formatters from my NIB file and replaced them with NSNumberFormatters. This was so that I could use the OS X v10.4 version rather than the buggy 10.0 one. I'm sure it would make no difference in this instance but I think it's better to adopt best practices early.
However, the actual solution is to re-set the string value of the NSTextFields:
[netAmountField setStringValue:[NSString stringWithFormat:@"%f", [netAmountField floatValue]]];
I'm still not 100% sure why this works when setting the value of the NSTextField to a float doesn't but, hey, at least it works.
Simon
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