Check if NSString is numeric

stringIsNumeric

-(BOOL)isNumeric:(NSString*)string {
    NSLocale *l_de = [[NSLocale alloc] initWithLocaleIdentifier: @"de_DE"];
    NSNumberFormatter *f = [[NSNumberFormatter alloc] init];
    [f setLocale: l_de];
    [f setAllowsFloats: YES];
    if ([f numberFromString:string]) {
        return YES;
    }
    
    return NO;
}