CODEWITHSUNDEEP
objective-cios6type-conversion
CGee
CGee

Reputation: 1650

Convert back localized NSString number (> 4 digits) to integer

I used the localizedStringWithFormat: method on NSString class to convert a seven digit integer number to an NSString somewhere in my code and need to convert it back to an integer now.

As my App is localized for different regions with different separators after three digits (e.g. '.' in the U.S. and ',' in Germany), what's the best way to convert a localized NSString integer value to an integer?

I tried integerValue on my string as follows but it didn't work:

// Somewhere in code:
int num = 1049000;
NSString *myLocalizedNumString = [NSString localizedStringWithFormat:@"%d", num];
// myLocalizedNumString (U.S.): '1,049,000'
// myLocalizedNumString (Germany): '1.049.000'

// Somewhere else where I have a reference to my string but none to the num:
int restoredNum = [myLocalizedNumString integerValue];
// restoredNum isn't 1049000 (it's 0, the initial value)

What would be a good working way of doing it?

Upvotes: 0

Views: 238

Answers (1)

CRD
CRD

Reputation: 53010

Despite its name NSNumberFormatter converts both ways, it is also a string parser. Using the method numberFromString after setting the number formatter’s numberStyle property to NSNumberFormatterDecimalStyle solves your problem.

The code might look as follows:

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init]; 
formatter.numberStyle = NSNumberFormatterDecimalStyle; 
NSInteger restoredNum = [[formatter numberFromString:myLocalizedNumString] integerValue];

Upvotes: 1

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