iOS: Why does NSRange always throw error "use of undeclared identifier"?

Question

These lines of code are the problem:

case CostPeriodMonthly:
            NSRange days = [gregorian rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:[NSDate date]];

            [endDateComponents setDay:days.length];
            [endDateComponents setMonth:[todayComponents month]];
            [endDateComponents setYear:[todayComponents year]];
            break;

The first line using days is highlighted saying "Use of undeclared identifier days" but why? What do I miss here?

There should be indication in Xcode which part of the line is exactly wrong. — Volker, Feb 16 '14 at 12:06
Yep, the first line using 'days', so [endDateComponents setDay:days.length]; and there 'days' is highlighted — MichiZH, Feb 16 '14 at 12:07
possible duplicate of [Why do my switch cases sometime need braces in Objective-C?](http://stackoverflow.com/questions/17582061/why-do-my-switch-cases-sometime-need-braces-in-objective-c) — Martin R, Feb 16 '14 at 12:22

score 3 · Accepted Answer · answered Feb 16 '14 at 12:10

3

If you want to declare new variables in a case statement, you have to enclose the statements in a {} block:

case CostPeriodMonthly: {
            NSRange days = [gregorian rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:[NSDate date]];

            [endDateComponents setDay:days.length];
            [endDateComponents setMonth:[todayComponents month]];
            [endDateComponents setYear:[todayComponents year]];
            break;
}

answered Feb 16 '14 at 12:10

Reinhard Männer

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Actually it is sufficient to add a semicolon after the case label. Introducing a scope with `{ ... }` might be necessary if you compile with ARC (see the "possible duplicate"). – Martin R Feb 16 '14 at 12:25

iOS: Why does NSRange always throw error "use of undeclared identifier"?

1 Answers1