Get AVSpeechSynthesisVoice by [NSLocale preferredLanguages]

result.md

NSLocale	AVSpeechSynthesisVoice.language
af	en-US
af_NA	en-US
af_ZA	en-ZA
agq	en-US
agq_CM	en-US
ak	en-US
ak_GH	en-US
am	en-US
am_ET	en-US
ar	ar-SA
ar_001	ar-SA
ar_AE	ar-SA
ar_BH	ar-SA
ar_DJ	ar-SA
ar_DZ	ar-SA
ar_EG	ar-SA
ar_EH	ar-SA
ar_ER	ar-SA
ar_IL	ar-SA
ar_IQ	ar-SA
ar_JO	ar-SA
ar_KM	ar-SA
ar_KW	ar-SA
ar_LB	ar-SA
ar_LY	ar-SA
ar_MA	ar-SA
ar_MR	ar-SA
ar_OM	ar-SA
ar_PS	ar-SA
ar_QA	ar-SA
ar_SA	ar-SA
ar_SD	ar-SA
ar_SO	ar-SA
ar_SS	ar-SA
ar_SY	ar-SA
ar_TD	ar-SA
ar_TN	ar-SA
ar_YE	ar-SA
as	en-US
as_IN	hi-IN
asa	en-US
asa_TZ	en-US
ast	en-US
ast_ES	es-ES
az	en-US
az_Cyrl	en-US
az_Cyrl_AZ	en-US
az_Latn	en-US
az_Latn_AZ	en-US
bas	en-US
bas_CM	en-US
be	en-US
be_BY	en-US
bem	en-US
bem_ZM	en-US
bez	en-US
bez_TZ	en-US
bg	en-US
bg_BG	en-US
bm	en-US
bm_ML	en-US
bn	en-US
bn_BD	en-US
bn_IN	hi-IN
bo	en-US
bo_CN	zh-CN
bo_IN	hi-IN
br	en-US
br_FR	fr-FR
brx	en-US
brx_IN	hi-IN
bs	en-US
bs_Cyrl	en-US
bs_Cyrl_BA	en-US
bs_Latn	en-US
bs_Latn_BA	en-US
ca	en-US
ca_AD	en-US
ca_ES	es-ES
ca_FR	fr-FR
ca_IT	it-IT
ce	en-US
ce_RU	ru-RU
cgg	en-US
cgg_UG	en-US
chr	en-US
chr_US	en-US
ckb	en-US
ckb_IQ	en-US
ckb_IR	en-US
cs	cs-CZ
cs_CZ	cs-CZ
cy	en-US
cy_GB	en-GB
da	da-DK
da_DK	da-DK
da_GL	da-DK
dav	en-US
dav_KE	en-US
de	de-DE
de_AT	de-DE
de_BE	de-DE
de_CH	de-DE
de_DE	de-DE
de_IT	de-DE
de_LI	de-DE
de_LU	de-DE
dje	en-US
dje_NE	en-US
dsb	en-US
dsb_DE	de-DE
dua	en-US
dua_CM	en-US
dyo	en-US
dyo_SN	en-US
dz	en-US
dz_BT	en-US
ebu	en-US
ebu_KE	en-US
ee	en-US
ee_GH	en-US
ee_TG	en-US
el	el-GR
el_CY	el-GR
el_GR	el-GR
en	en-US
en_001	en-US
en_150	en-US
en_AD	en-US
en_AG	en-US
en_AI	en-US
en_AL	en-US
en_AR	en-US
en_AS	en-US
en_AT	en-US
en_AU	en-AU
en_BA	en-US
en_BB	en-US
en_BD	en-US
en_BE	en-US
en_BG	en-US
en_BI	en-US
en_BM	en-US
en_BR	en-US
en_BS	en-US
en_BW	en-US
en_BZ	en-US
en_CA	en-US
en_CC	en-US
en_CH	en-US
en_CK	en-US
en_CM	en-US
en_CN	en-US
en_CX	en-US
en_CY	en-US
en_CZ	en-US
en_DE	en-US
en_DG	en-US
en_DK	en-US
en_DM	en-US
en_EE	en-US
en_ER	en-US
en_ES	en-US
en_FI	en-US
en_FJ	en-US
en_FK	en-US
en_FM	en-US
en_FR	en-US
en_GB	en-GB
en_GD	en-US
en_GG	en-US
en_GH	en-US
en_GI	en-US
en_GM	en-US
en_GR	en-US
en_GU	en-US
en_GY	en-US
en_HK	en-US
en_HR	en-US
en_HU	en-US
en_ID	en-US
en_IE	en-IE
en_IL	en-US
en_IM	en-US
en_IN	en-US
en_IO	en-US
en_IS	en-US
en_IT	en-US
en_JE	en-US
en_JM	en-US
en_JP	en-US
en_KE	en-US
en_KI	en-US
en_KN	en-US
en_KR	en-US
en_KY	en-US
en_LC	en-US
en_LR	en-US
en_LS	en-US
en_LT	en-US
en_LU	en-US
en_LV	en-US
en_ME	en-US
en_MG	en-US
en_MH	en-US
en_MO	en-US
en_MP	en-US
en_MS	en-US
en_MT	en-US
en_MU	en-US
en_MV	en-US
en_MW	en-US
en_MY	en-US
en_NA	en-US
en_NF	en-US
en_NG	en-US
en_NL	en-US
en_NO	en-US
en_NR	en-US
en_NU	en-US
en_NZ	en-US
en_PG	en-US
en_PH	en-US
en_PK	en-US
en_PL	en-US
en_PN	en-US
en_PR	en-US
en_PT	en-US
en_PW	en-US
en_RO	en-US
en_RU	en-US
en_RW	en-US
en_SA	en-US
en_SB	en-US
en_SC	en-US
en_SD	en-US
en_SE	en-US
en_SG	en-US
en_SH	en-US
en_SI	en-US
en_SK	en-US
en_SL	en-US
en_SS	en-US
en_SX	en-US
en_SZ	en-US
en_TC	en-US
en_TH	en-US
en_TK	en-US
en_TO	en-US
en_TR	en-US
en_TT	en-US
en_TV	en-US
en_TW	en-US
en_TZ	en-US
en_UG	en-US
en_UM	en-US
en_US	en-US
en_US_POSIX	en-US
en_VC	en-US
en_VG	en-US
en_VI	en-US
en_VU	en-US
en_WS	en-US
en_ZA	en-ZA
en_ZM	en-US
en_ZW	en-US
eo	en-US
es	es-ES
es_419	es-ES
es_AG	es-ES
es_AI	es-ES
es_AR	es-ES
es_AW	es-ES
es_BB	es-ES
es_BL	es-ES
es_BM	es-ES
es_BO	es-ES
es_BQ	es-ES
es_BR	es-ES
es_BS	es-ES
es_BZ	es-ES
es_CL	es-ES
es_CO	es-ES
es_CR	es-ES
es_CU	es-ES
es_CW	es-ES
es_DM	es-ES
es_DO	es-ES
es_EA	es-ES
es_EC	es-ES
es_ES	es-ES
es_FK	es-ES
es_GD	es-ES
es_GF	es-ES
es_GL	es-ES
es_GP	es-ES
es_GQ	es-ES
es_GT	es-ES
es_GY	es-ES
es_HN	es-ES
es_HT	es-ES
es_IC	es-ES
es_KN	es-ES
es_KY	es-ES
es_LC	es-ES
es_MF	es-ES
es_MQ	es-ES
es_MS	es-ES
es_MX	es-MX
es_NI	es-ES
es_PA	es-ES
es_PE	es-ES
es_PH	es-ES
es_PM	es-ES
es_PR	es-ES
es_PY	es-ES
es_SR	es-ES
es_SV	es-ES
es_SX	es-ES
es_TC	es-ES
es_TT	es-ES
es_US	es-ES
es_UY	es-ES
es_VC	es-ES
es_VE	es-ES
es_VG	es-ES
es_VI	es-ES
et	en-US
et_EE	en-US
eu	en-US
eu_ES	es-ES
ewo	en-US
ewo_CM	en-US
fa	en-US
fa_AF	en-US
fa_IR	en-US
ff	en-US
ff_CM	en-US
ff_GN	en-US
ff_MR	en-US
ff_SN	en-US
fi	fi-FI
fi_FI	fi-FI
fil	en-US
fil_PH	en-US
fo	en-US
fo_DK	da-DK
fo_FO	en-US
fr	fr-FR
fr_BE	fr-FR
fr_BF	fr-FR
fr_BI	fr-FR
fr_BJ	fr-FR
fr_BL	fr-FR
fr_CA	fr-CA
fr_CD	fr-FR
fr_CF	fr-FR
fr_CG	fr-FR
fr_CH	fr-FR
fr_CI	fr-FR
fr_CM	fr-FR
fr_DJ	fr-FR
fr_DZ	fr-FR
fr_FR	fr-FR
fr_GA	fr-FR
fr_GF	fr-FR
fr_GN	fr-FR
fr_GP	fr-FR
fr_GQ	fr-FR
fr_HT	fr-FR
fr_KM	fr-FR
fr_LU	fr-FR
fr_MA	fr-FR
fr_MC	fr-FR
fr_MF	fr-FR
fr_MG	fr-FR
fr_ML	fr-FR
fr_MQ	fr-FR
fr_MR	fr-FR
fr_MU	fr-FR
fr_NC	fr-FR
fr_NE	fr-FR
fr_PF	fr-FR
fr_PM	fr-FR
fr_RE	fr-FR
fr_RW	fr-FR
fr_SC	fr-FR
fr_SN	fr-FR
fr_SY	fr-FR
fr_TD	fr-FR
fr_TG	fr-FR
fr_TN	fr-FR
fr_VU	fr-FR
fr_WF	fr-FR
fr_YT	fr-FR
fur	en-US
fur_IT	it-IT
fy	en-US
fy_NL	nl-NL
ga	en-US
ga_IE	en-IE
gd	en-US
gd_GB	en-GB
gl	en-US
gl_ES	es-ES
gsw	en-US
gsw_CH	en-US
gsw_FR	fr-FR
gsw_LI	en-US
gu	en-US
gu_IN	hi-IN
guz	en-US
guz_KE	en-US
gv	en-US
gv_IM	en-US
ha	en-US
ha_GH	en-US
ha_NE	en-US
ha_NG	en-US
haw	en-US
haw_US	en-US
he	he-IL
he_IL	he-IL
hi	hi-IN
hi_IN	hi-IN
hr	en-US
hr_BA	en-US
hr_HR	en-US
hsb	en-US
hsb_DE	de-DE
hu	hu-HU
hu_HU	hu-HU
hy	en-US
hy_AM	en-US
id	id-ID
id_ID	id-ID
ig	en-US
ig_NG	en-US
ii	en-US
ii_CN	zh-CN
is	en-US
is_IS	en-US
it	it-IT
it_CH	it-IT
it_IT	it-IT
it_SM	it-IT
it_VA	it-IT
iu	en-US
iu_CA	fr-CA
ja	ja-JP
ja_JP	ja-JP
jgo	en-US
jgo_CM	en-US
jmc	en-US
jmc_TZ	en-US
ka	en-US
ka_GE	en-US
kab	en-US
kab_DZ	en-US
kam	en-US
kam_KE	en-US
kde	en-US
kde_TZ	en-US
kea	en-US
kea_CV	en-US
khq	en-US
khq_ML	en-US
ki	en-US
ki_KE	en-US
kk	en-US
kk_KZ	en-US
kkj	en-US
kkj_CM	en-US
kl	en-US
kl_GL	en-US
kln	en-US
kln_KE	en-US
km	en-US
km_KH	en-US
kn	en-US
kn_IN	hi-IN
ko	ko-KR
ko_KP	ko-KR
ko_KR	ko-KR
kok	en-US
kok_IN	hi-IN
ks	en-US
ks_IN	hi-IN
ksb	en-US
ksb_TZ	en-US
ksf	en-US
ksf_CM	en-US
ksh	en-US
ksh_DE	de-DE
kw	en-US
kw_GB	en-GB
ky	en-US
ky_KG	en-US
lag	en-US
lag_TZ	en-US
lb	en-US
lb_LU	en-US
lg	en-US
lg_UG	en-US
lkt	en-US
lkt_US	en-US
ln	en-US
ln_AO	en-US
ln_CD	en-US
ln_CF	en-US
ln_CG	en-US
lo	en-US
lo_LA	en-US
lrc	en-US
lrc_IQ	en-US
lrc_IR	en-US
lt	en-US
lt_LT	en-US
lu	en-US
lu_CD	en-US
luo	en-US
luo_KE	en-US
luy	en-US
luy_KE	en-US
lv	en-US
lv_LV	en-US
mas	en-US
mas_KE	en-US
mas_TZ	en-US
mer	en-US
mer_KE	en-US
mfe	en-US
mfe_MU	en-US
mg	en-US
mg_MG	en-US
mgh	en-US
mgh_MZ	en-US
mgo	en-US
mgo_CM	en-US
mk	en-US
mk_MK	en-US
ml	en-US
ml_IN	hi-IN
mn	en-US
mn_MN	en-US
mr	en-US
mr_IN	hi-IN
ms	en-US
ms_Arab	en-US
ms_Arab_BN	en-US
ms_Arab_MY	en-US
ms_BN	en-US
ms_MY	en-US
ms_SG	en-US
mt	en-US
mt_MT	en-US
mua	en-US
mua_CM	en-US
my	en-US
my_MM	en-US
mzn	en-US
mzn_IR	en-US
naq	en-US
naq_NA	en-US
nb	en-US
nb_NO	no-NO
nb_SJ	en-US
nd	en-US
nd_ZW	en-US
nds	en-US
nds_DE	de-DE
nds_NL	nl-NL
ne	en-US
ne_IN	hi-IN
ne_NP	en-US
nl	nl-NL
nl_AW	nl-NL
nl_BE	nl-BE
nl_BQ	nl-NL
nl_CW	nl-NL
nl_NL	nl-NL
nl_SR	nl-NL
nl_SX	nl-NL
nmg	en-US
nmg_CM	en-US
nn	en-US
nn_NO	no-NO
nnh	en-US
nnh_CM	en-US
nus	en-US
nus_SS	en-US
nyn	en-US
nyn_UG	en-US
om	en-US
om_ET	en-US
om_KE	en-US
or	en-US
or_IN	hi-IN
os	en-US
os_GE	en-US
os_RU	ru-RU
pa	en-US
pa_Arab	en-US
pa_Arab_PK	en-US
pa_Guru	en-US
pa_Guru_IN	hi-IN
pl	pl-PL
pl_PL	pl-PL
ps	en-US
ps_AF	en-US
pt	pt-PT
pt_AO	pt-PT
pt_BR	pt-BR
pt_CH	pt-PT
pt_CV	pt-PT
pt_FR	pt-PT
pt_GQ	pt-PT
pt_GW	pt-PT
pt_LU	pt-PT
pt_MO	pt-PT
pt_MZ	pt-PT
pt_PT	pt-PT
pt_ST	pt-PT
pt_TL	pt-PT
qu	en-US
qu_BO	en-US
qu_EC	en-US
qu_PE	en-US
rm	en-US
rm_CH	en-US
rn	en-US
rn_BI	en-US
ro	ro-RO
ro_MD	ro-RO
ro_RO	ro-RO
rof	en-US
rof_TZ	en-US
ru	ru-RU
ru_BY	ru-RU
ru_KG	ru-RU
ru_KZ	ru-RU
ru_MD	ru-RU
ru_RU	ru-RU
ru_UA	ru-RU
rw	en-US
rw_RW	en-US
rwk	en-US
rwk_TZ	en-US
sah	en-US
sah_RU	ru-RU
saq	en-US
saq_KE	en-US
sbp	en-US
sbp_TZ	en-US
se	en-US
se_FI	fi-FI
se_NO	no-NO
se_SE	sv-SE
seh	en-US
seh_MZ	en-US
ses	en-US
ses_ML	en-US
sg	en-US
sg_CF	en-US
shi	en-US
shi_Latn	en-US
shi_Latn_MA	en-US
shi_Tfng	en-US
shi_Tfng_MA	en-US
si	en-US
si_LK	en-US
sk	sk-SK
sk_SK	sk-SK
sl	en-US
sl_SI	en-US
smn	en-US
smn_FI	fi-FI
sn	en-US
sn_ZW	en-US
so	en-US
so_DJ	en-US
so_ET	en-US
so_KE	en-US
so_SO	en-US
sq	en-US
sq_AL	en-US
sq_MK	en-US
sq_XK	en-US
sr	en-US
sr_Cyrl	en-US
sr_Cyrl_BA	en-US
sr_Cyrl_ME	en-US
sr_Cyrl_RS	en-US
sr_Cyrl_XK	en-US
sr_Latn	en-US
sr_Latn_BA	en-US
sr_Latn_ME	en-US
sr_Latn_RS	en-US
sr_Latn_XK	en-US
sv	sv-SE
sv_AX	sv-SE
sv_FI	sv-SE
sv_SE	sv-SE
sw	en-US
sw_CD	en-US
sw_KE	en-US
sw_TZ	en-US
sw_UG	en-US
ta	en-US
ta_IN	hi-IN
ta_LK	en-US
ta_MY	en-US
ta_SG	en-US
te	en-US
te_IN	hi-IN
teo	en-US
teo_KE	en-US
teo_UG	en-US
tg	en-US
tg_TJ	en-US
th	th-TH
th_TH	th-TH
ti	en-US
ti_ER	en-US
ti_ET	en-US
tk	en-US
tk_TM	en-US
to	en-US
to_TO	en-US
tr	tr-TR
tr_CY	tr-TR
tr_TR	tr-TR
twq	en-US
twq_NE	en-US
tzm	en-US
tzm_MA	en-US
ug	en-US
ug_CN	zh-CN
uk	en-US
uk_UA	en-US
ur	en-US
ur_IN	hi-IN
ur_PK	en-US
uz	en-US
uz_Arab	en-US
uz_Arab_AF	en-US
uz_Cyrl	en-US
uz_Cyrl_UZ	en-US
uz_Latn	en-US
uz_Latn_UZ	en-US
vai	en-US
vai_Latn	en-US
vai_Latn_LR	en-US
vai_Vaii	en-US
vai_Vaii_LR	en-US
vi	en-US
vi_VN	en-US
vun	en-US
vun_TZ	en-US
wae	en-US
wae_CH	en-US
xog	en-US
xog_UG	en-US
yav	en-US
yav_CM	en-US
yi	en-US
yi_001	en-US
yo	en-US
yo_BJ	en-US
yo_NG	en-US
yue	en-US
yue_Hans	en-US
yue_Hans_CN	zh-CN
yue_Hant	en-US
yue_Hant_HK	zh-HK
zgh	en-US
zgh_MA	en-US
zh	zh-CN
zh_Hans	zh-CN
zh_Hans_CN	zh-CN
zh_Hans_HK	zh-HK
zh_Hans_MO	zh-CN
zh_Hans_SG	zh-CN
zh_Hant	zh-CN
zh_Hant_HK	zh-HK
zh_Hant_MO	zh-CN
zh_Hant_TW	zh-TW
zu	en-US
zu_ZA	en-ZA

SpeechVoiceFromLocaleLanguageCode.m

AVSpeechSynthesisVoice *SpeechVoiceFromLocaleLanguageCode(NSString *langCode) {
    NSArray<NSString*> *langCodeParts = [[langCode stringByReplacingOccurrencesOfString:@"-" withString:@"_"] componentsSeparatedByString:@"_"];
    NSArray<AVSpeechSynthesisVoice*> *availTTSVoices = [AVSpeechSynthesisVoice speechVoices];
    NSMutableArray<AVSpeechSynthesisVoice*> *filteredVoices = [NSMutableArray array];
    AVSpeechSynthesisVoice *selectedVoice = nil, *defaultVoice = nil;
    // first round filter, uses prefix.
    for (AVSpeechSynthesisVoice *voice in availTTSVoices) {
        if (!defaultVoice && [voice.language isEqualToString:@"en-US"]) {
            defaultVoice = voice;
        }
        if ([voice.language hasPrefix:langCodeParts.firstObject]) {
            [filteredVoices addObject:voice];
        }
    }
    if (!filteredVoices.count) {
        // second round filter, uses other parts
        for (AVSpeechSynthesisVoice *voice in availTTSVoices) {
            for (NSUInteger idx = 1; idx < langCodeParts.count; idx++) {
                if ([voice.language rangeOfString:langCodeParts[idx]].location != NSNotFound) {
                    [filteredVoices addObject:voice];
                    break;
                }
            }
        }
    }
    if (filteredVoices.count) { // now start pick
        // first round, similar to equal
        for (AVSpeechSynthesisVoice *voice in filteredVoices) {
            for (NSUInteger idx = 1; idx < langCodeParts.count; idx++) {
                if ([voice.language rangeOfString:langCodeParts[idx]].location != NSNotFound) {
                    selectedVoice = voice;
                    break;
                }
            }
        }
        if (!selectedVoice) {
            NSDictionary *multiLangsDict = @{@"en": @"en-US", @"fr": @"fr-FR", @"es": @"es-ES", @"nl": @"nl-NL", @"zh": @"zh-CN", @"pt": @"pt-PT"};
            // if the prefix is in the keys, then pick a voice by the relative value,
            // do not pick by random, because it may pick [en-AU] instead of [en-US] for [en_XX]
            if ([multiLangsDict.allKeys indexOfObject:langCodeParts.firstObject] != NSNotFound) {
                NSString *voiceLang = multiLangsDict[langCodeParts.firstObject];
                for (AVSpeechSynthesisVoice *voice in filteredVoices) {
                    if ([voice.language isEqualToString:voiceLang]) {
                        selectedVoice = voice;
                        break;
                    }
                }
            }
        }
        if (!selectedVoice) {
            selectedVoice = filteredVoices.firstObject;
        }
    }
    return selectedVoice ?: defaultVoice;
}