Whenever a user would type a number, my app would automatically prepend a currency sign before that number. For example, when the user types "1" in a text field, the text inside it becomes "$1.00". All is good when I use an NSNumberFormatter, an NSTextField, and its delegate method control:didFailToFormatString:errorDescription:
.
- (BOOL)control:(NSControl *)control didFailToFormatString:(NSString *)string errorDescription:(NSString *)error
{
if ([[control forma开发者_如何转开发tter] isKindOfClass:[NSNumberFormatter class]])
{
NSNumberFormatter *formatter = [control formatter];
if ([formatter numberStyle] == NSNumberFormatterCurrencyStyle && !
[string hasPrefix:[formatter currencySymbol]])
{
NSDecimalNumber *new = [NSDecimalNumber decimalNumberWithString:string];
if (new == [NSDecimalNumber notANumber]) {
new = [NSDecimalNumber zero];
}
[control setObjectValue:new];
}
}
return YES;}
Now I would like to have this functionality when a user types a number in a cell inside an NSTableView. I tried using control:didFailToFormatString:errorDescription:
but the cell would erase the text instead.
I just want to let everybody know that I have solved the problem by asking for the NSTableView's currentEditor, and replacing the text from there.
Additionally, [control formatter]
will return nil if the receiver is an NSTableView.
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