详见：https://www.theiphonewiki.com/wiki/Models
1.需要导入头文件：#import
2.获取设备信息
struct utsname systemInfo;
uname(&systemInfo);
NSString * platform = [NSString stringWithCString:systemInfo.machine encoding:NSASCIIStringEncoding];
3.将设备信息转化为设备型号
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:@"iPhone10,1"]) return @"iPhone 8";
if ([platform isEqualToString:@"iPhone10,4"]) return @"iPhone 8";
if ([platform isEqualToString:@"iPhone10,2"]) return @"iPhone 8 Plus";
if ([platform isEqualToString:@"iPhone10,5"]) return @"iPhone 8 Plus";
if ([platform isEqualToString:@"iPhone10,3"]) return @"iPhone X";
if ([platform isEqualToString:@"iPhone10,6"]) 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 XS Max";
if ([platform isEqualToString:@"iPhone11,8"]) 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";
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:@"iPod7,1"]) return @"iPod Touch 6G";
if ([platform isEqualToString:@"iPod9,1"]) return @"iPod Touch 7G";
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:@"iPad6,11"]) return@"iPad 5";
if ([platform isEqualToString:@"iPad6,12"]) return@"iPad 5";
if ([platform isEqualToString:@"iPad7,5"])return@"iPad 6";
if ([platform isEqualToString:@"iPad7,6"])return@"iPad 6";
if ([platform isEqualToString:@"iPad7,11"])return@"iPad 7";
if ([platform isEqualToString:@"iPad7,12"])return@"iPad 7";
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:@"iPad5,3"]) return @"iPad Air 2";
if ([platform isEqualToString:@"iPad5,4"]) return @"iPad Air 2";
if ([platform isEqualToString:@"iPad11,3"]) return @"iPad Air 3";
if ([platform isEqualToString:@"iPad11,4"]) return @"iPad Air 3";
if ([platform isEqualToString:@"iPad2,5"]) return @"iPad Mini";
if ([platform isEqualToString:@"iPad2,6"]) return @"iPad Mini";
if ([platform isEqualToString:@"iPad2,7"]) return @"iPad Mini";
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:@"iPad4,7"]) return @"iPad Mini 3";
if ([platform isEqualToString:@"iPad4,8"]) return @"iPad Mini 3";
if ([platform isEqualToString:@"iPad4,9"]) return @"iPad Mini 3";
if ([platform isEqualToString:@"iPad5,1"]) return @"iPad Mini 4";
if ([platform isEqualToString:@"iPad5,2"]) return @"iPad Mini 4";
if ([platform isEqualToString:@"iPad11,1"]) return @"iPad Mini 5";
if ([platform isEqualToString:@"iPad11,2"]) return @"iPad Mini 5";
if ([platform isEqualToString:@"iPad6,3"]) return @"iPad Pro 9.7";
if ([platform isEqualToString:@"iPad6,4"]) return @"iPad Pro 9.7";
if ([platform isEqualToString:@"iPad6,7"]) return @"iPad Pro 12.9";
if ([platform isEqualToString:@"iPad6,8"]) return @"iPad Pro 12.9";
if ([platform isEqualToString:@"iPad7,1"]) return @"iPad Pro 2 12.9";
if ([platform isEqualToString:@"iPad7,2"]) return @"iPad Pro 2 12.9";
if ([platform isEqualToString:@"iPad7,3"])return@"iPad Pro 10.5";
if ([platform isEqualToString:@"iPad7,4"])return@"iPad Pro 10.5";
if ([platform isEqualToString:@"iPad8,1"])return@"iPad Pro 11";
if ([platform isEqualToString:@"iPad8,2"])return@"iPad Pro 11";
if ([platform isEqualToString:@"iPad8,3"])return@"iPad Pro 11";
if ([platform isEqualToString:@"iPad8,4"])return@"iPad Pro 11";
if ([platform isEqualToString:@"iPad8,5"])return@"iPad Pro 3 12.9";
if ([platform isEqualToString:@"iPad8,6"])return@"iPad Pro 3 12.9";
if ([platform isEqualToString:@"iPad8,7"])return@"iPad Pro 3 12.9";
if ([platform isEqualToString:@"iPad8,8"])return@"iPad Pro 3 12.9";