Question

在我的Mac上，我使用NSPrintInfo和[NSPrintInfo localizedPaperName]来确定默认纸张尺寸是否为＆＃34; US Letter＆＃34;或＆＃34; A4＆＃34;。

NSPrintInfo * printInfo = [NSPrintInfo sharedPrintInfo]; [printInfo localizedPaperName]

如何让iOS设备告诉我默认纸张尺寸是否为＆＃34; US Letter＆＃34;或＆＃34; A4＆＃34;？

Answer 1

由于没有人提出更好的方法，我通过获取NSLocaleCountryCode来查找使用US letter的国家并开始检查此列表

 [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"US"]||
        [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"CA"]||
        [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"MX"]||
        [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"CU"]||
        [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"DO"]||
        [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"GT"]||
        [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"CR"]||
        [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"SV"]||
        [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"HN"]||
        [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"BO"]||
        [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"CO"]||
        [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"VE"]||
        [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"PH"]||
        [[[NSLocale currentLocale] objectForKey:NSLocaleCountryCode] isEqualToString:@"CL"]

Answer 2

我使用类似的固定列表方法，如@ spacecash21建议，基于此地图： https://en.wikipedia.org/wiki/Paper_size#/media/File:Prevalent_default_paper_size.svg

+ (NSString*)defaultPaperName
{
    // as it looks mostly US and Canada and the Philippines are actually using the US Letter format, usage of the metric system is no clue
    // https://en.wikipedia.org/wiki/Paper_size#/media/File:Prevalent_default_paper_size.svg
    static NSSet* letterCountries;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        letterCountries = [NSSet setWithArray:@[@"US", @"CA", @"MX", @"CU", @"DO", @"GT", @"CR", @"SV", @"HN", @"BO", @"CO", @"VE", @"PH", @"CL"]];
    });

    NSString* countryCode = NSLocale.currentLocale.countryCode;
    if ([letterCountries containsObject:countryCode.uppercaseString])
        return @"na-letter";

    return @"iso-a4";
}

NSPrintInfo localizedPaperName，如何在ios中获取纸质名称？

2 个答案: