機種、画面サイズ、言語の判定

簡単だけど、いつも何だっけかなぁって思う各種判定。
コードスニペットに登録しても便利かも。

細かいデバイスの取得はErica SadunさんのUIDevice-Hardwareが便利です。

YSDeviceHelper.h

// iPhoneか
+ (BOOL)isPhone;
// Retinaディスプレイか
+ (BOOL)isRetina;
// 4inch(iPhone5)か
+ (BOOL)is568h;
// 言語環境が日本語か
+ (BOOL)isJapaneseLanguage;

YSDeviceHelper.m

+ (BOOL)isPhone
{
    static BOOL isPhone;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        isPhone = [UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone;
    });
    return isPhone;
}

+ (BOOL)isRetina
{
    static BOOL isRetina;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        isRetina = [UIScreen mainScreen].scale == 2.f;
    });
    return isRetina;
}

+ (BOOL)is568h
{
    static BOOL is568h;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        CGFloat height = [UIScreen mainScreen].bounds.size.height;
        is568h = height == 568.f;
    });
    return is568h;
}

+ (BOOL)isJapaneseLanguage
{
    static BOOL isJapanese;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        NSArray *languages = [NSLocale preferredLanguages];
        NSString *currentLanguage = [languages objectAtIndex:0];
        isJapanese = [currentLanguage isEqualToString:@"ja"];
    });
    return isJapanese;
}