原文链接
需要导入头文件：#import <sys/utsname.h>

#pragma mark 判断机型

- (NSString *)iphoneType {
    
    struct utsname systemInfo;
    
    uname(&systemInfo);
    
    NSString *platform = [NSString stringWithCString:systemInfo.machine encoding:NSASCIIStringEncoding];
    
    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";

    if ([platform isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";

    if ([platform isEqualToString:@"iPhone5,1"]) return @"iPhone 5";

    if ([platform isEqualToString:@"iPhone5,2"]) return @"iPhone 5";

    if ([platform isEqualToString:@"iPhone5,3"]) return @"iPhone 5c";

    if ([platform isEqualToString:@"iPhone5,4"]) return @"iPhone 5c";

    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:@"iPhone8,4"]) return @"iPhone SE";

    if ([platform isEqualToString:@"iPhone9,1"]) return @"iPhone 7";

    if ([platform isEqualToString:@"iPhone9,2"]) return @"iPhone 7 Plus";

    if ([platform isEqualToString:@"iPod1,1"])   return @"iPod Touch 1G";

    if ([platform isEqualToString:@"iPod2,1"])   return @"iPod Touch 2G";

    if ([platform isEqualToString:@"iPod3,1"])   return @"iPod Touch 3G";

    if ([platform isEqualToString:@"iPod4,1"])   return @"iPod Touch 4G";

    if ([platform isEqualToString:@"iPod5,1"])   return @"iPod Touch 5G";

    if ([platform isEqualToString:@"iPad1,1"])   return @"iPad 1G";

    if ([platform isEqualToString:@"iPad2,1"])   return @"iPad 2";

    if ([platform isEqualToString:@"iPad2,2"])   return @"iPad 2";

    if ([platform isEqualToString:@"iPad2,3"])   return @"iPad 2";

    if ([platform isEqualToString:@"iPad2,4"])   return @"iPad 2";

    if ([platform isEqualToString:@"iPad2,5"])   return @"iPad Mini 1G";

    if ([platform isEqualToString:@"iPad2,6"])   return @"iPad Mini 1G";

    if ([platform isEqualToString:@"iPad2,7"])   return @"iPad Mini 1G";

    if ([platform isEqualToString:@"iPad3,1"])   return @"iPad 3";

    if ([platform isEqualToString:@"iPad3,2"])   return @"iPad 3";

    if ([platform isEqualToString:@"iPad3,3"])   return @"iPad 3";

    if ([platform isEqualToString:@"iPad3,4"])   return @"iPad 4";

    if ([platform isEqualToString:@"iPad3,5"])   return @"iPad 4";

    if ([platform isEqualToString:@"iPad3,6"])   return @"iPad 4";

    if ([platform isEqualToString:@"iPad4,1"])   return @"iPad Air";

    if ([platform isEqualToString:@"iPad4,2"])   return @"iPad Air";

    if ([platform isEqualToString:@"iPad4,3"])   return @"iPad Air";

    if ([platform isEqualToString:@"iPad4,4"])   return @"iPad Mini 2G";

    if ([platform isEqualToString:@"iPad4,5"])   return @"iPad Mini 2G";

    if ([platform isEqualToString:@"iPad4,6"])   return @"iPad Mini 2G";

    if ([platform isEqualToString:@"i386"])      return @"iPhone Simulator";

    if ([platform isEqualToString:@"x86_64"])    return @"iPhone Simulator";
    
    return platform;
    
}