iOS 檢測具體設備型號（iPhone 4/5/6...）：sysctlbyname 獲取硬件標識映射表

[[UIDevice currentDevice] systemVersion] 只能獲取系統版本，無法區分具體機型。需用 sysctlbyname("hw.machine") 獲取硬件標譯（如 iPhone10,1），再映射為人類可讀名稱。

完整映射方法

- (NSString *)platformString {
    size_t size;
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);
    char *machine = malloc(size);
    sysctlbyname("hw.machine", machine, &size, NULL, 0);
    NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];
    free(machine);
    
    // 映射表（持續更新新機型）
    if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 2G";
    if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";
    if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";
    if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,2"]) return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,3"]) return @"iPhone 4 (CDMA)";
    if ([platform isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";
    if ([platform isEqualToString:@"iPhone5,1"]) return @"iPhone 5";
    if ([platform isEqualToString:@"iPhone5,2"]) return @"iPhone 5 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPhone6,1"]) return @"iPhone 5s";
    if ([platform isEqualToString:@"iPhone6,2"]) return @"iPhone 5s";
    if ([platform isEqualToString:@"iPhone7,1"]) return @"iPhone 6 Plus";
    if ([platform isEqualToString:@"iPhone7,2"]) return @"iPhone 6";
    if ([platform isEqualToString:@"iPhone8,1"]) return @"iPhone 6s";
    if ([platform isEqualToString:@"iPhone8,2"]) return @"iPhone 6s Plus";
    if ([platform isEqualToString:@"iPhone9,1"]) return @"iPhone 7";
    if ([platform isEqualToString:@"iPhone9,2"]) return @"iPhone 7 Plus";
    if ([platform isEqualToString:@"iPhone10,1"]) return @"iPhone 8";
    if ([platform isEqualToString:@"iPhone10,2"]) return @"iPhone 8 Plus";
    if ([platform isEqualToString:@"iPhone10,3"]) return @"iPhone X";
    if ([platform isEqualToString:@"iPhone11,2"]) return @"iPhone XS";
    if ([platform isEqualToString:@"iPhone11,4"]) return @"iPhone XS Max";
    if ([platform isEqualToString:@"iPhone11,6"]) return @"iPhone XR";
    if ([platform isEqualToString:@"iPhone12,1"]) return @"iPhone 11";
    if ([platform isEqualToString:@"iPhone12,3"]) return @"iPhone 11 Pro";
    if ([platform isEqualToString:@"iPhone12,5"]) return @"iPhone 11 Pro Max";
    // ... 新機型需持續補充
    
    if ([platform hasPrefix:@"iPad"]) return @"iPad 系列";
    if ([platform hasPrefix:@"iPod"]) return @"iPod touch 系列";
    if ([platform isEqualToString:@"i386"] || [platform isEqualToString:@"x86_64"]) return @"Simulator";
    
    return platform; // 未知返回原標識
}

調用示例

NSString *deviceModel = [self platformString];
NSLog(@"Device: %@", deviceModel); // 輸出如 "iPhone 11 Pro Max"

注意事項

• 映射表需隨 Apple 發布新設備持續維護（可參考開源庫如 DeviceKit）。
• 模擬器返回 i386 (32位) 或 x86_64 (64位)。
• 不可依賴 UIDevice.model (如 iPhone)，不夠具體。

硬件標識映射，精準識別每一款 iOS 設備。