首先必须导入 #import <sys/utsname.h> ，友情提示导入这个头文件是不会自动提示的

+ (NSString*)deviceModel
{
    // 需要
    struct utsname systemInfo;
    uname(&systemInfo);
    NSString * deviceString = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
    //iPhone
    if ([deviceString isEqualToString:@"iPhone1,1"])    return @"iPhone 1G";
    if ([deviceString isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
    if ([deviceString isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
    if ([deviceString isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
    if ([deviceString isEqualToString:@"iPhone3,2"])    return @"Verizon iPhone 4";
    if ([deviceString isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
    if ([deviceString isEqualToString:@"iPhone5,1"])    return @"iPhone 5";
    if ([deviceString isEqualToString:@"iPhone5,2"])    return @"iPhone 5";
    if ([deviceString isEqualToString:@"iPhone5,3"])    return @"iPhone 5C";
    if ([deviceString isEqualToString:@"iPhone5,4"])    return @"iPhone 5C";
    if ([deviceString isEqualToString:@"iPhone6,1"])    return @"iPhone 5S";
    if ([deviceString isEqualToString:@"iPhone6,2"])    return @"iPhone 5S";
    if ([deviceString isEqualToString:@"iPhone7,1"])    return @"iPhone 6 Plus";
    if ([deviceString isEqualToString:@"iPhone7,2"])    return @"iPhone 6";
    if ([deviceString isEqualToString:@"iPhone8,1"])    return @"iPhone 6s";
    if ([deviceString isEqualToString:@"iPhone8,2"])    return @"iPhone 6s Plus";
    if ([deviceString isEqualToString:@"iPhone8,4"])    return @"iPhone SE";
    if ([deviceString isEqualToString:@"iPhone9,1"])    return @"iPhone 7";
    if ([deviceString isEqualToString:@"iPhone9,2"])    return @"iPhone 7 Plus";
    if ([deviceString isEqualToString:@"iPhone10,1"])   return @"iPhone 8";
    if ([deviceString isEqualToString:@"iPhone10,4"])   return @"iPhone 8";
    if ([deviceString isEqualToString:@"iPhone10,2"])   return @"iPhone 8 Plus";
    if ([deviceString isEqualToString:@"iPhone10,5"])   return @"iPhone 8 Plus";
    if ([deviceString isEqualToString:@"iPhone10,3"])   return @"iPhone X";
    if ([deviceString isEqualToString:@"iPhone10,6"])   return @"iPhone X";
    if ([deviceString isEqualToString:@"iPhone11,8"])   return @"iPhone XR";
    if ([deviceString isEqualToString:@"iPhone11,2"])   return @"iPhone XS";
    if ([deviceString isEqualToString:@"iPhone11,4"])   return @"iPhone XS Max";
    if ([deviceString isEqualToString:@"iPhone11,6"])   return @"iPhone XS Max";
    if ([deviceString isEqualToString:@"iPhone12,1"])   return @"iPhone 11";
    if ([deviceString isEqualToString:@"iPhone12,3"])   return @"iPhone 11 Pro";
    if ([deviceString isEqualToString:@"iPhone12,5"])   return @"iPhone 11 Pro Max";
    if ([deviceString isEqualToString:@"iPhone12,8"])   return @"iPhone SE";
    
    if ([deviceString isEqualToString:@"iPhone13,1"])   return @"iPhone 12 mini";
    if ([deviceString isEqualToString:@"iPhone13,2"])   return @"iPhone 12";
    if ([deviceString isEqualToString:@"iPhone13,3"])   return @"iPhone 12 Pro";
    if ([deviceString isEqualToString:@"iPhone13,4"])   return @"iPhone 12 Pro Max";
    
    if ([deviceString isEqualToString:@"iPhone14,4"])   return @"iPhone 13 mini";
    if ([deviceString isEqualToString:@"iPhone14,5"])   return @"iPhone 13";
    if ([deviceString isEqualToString:@"iPhone14,2"])   return @"iPhone 13 Pro";
    if ([deviceString isEqualToString:@"iPhone14,3"])   return @"iPhone 13 Pro Max";
    if ([deviceString isEqualToString:@"iPhone14,6"])   return @"iPhone SE";
    
    return deviceString;
}

Models地址