用OC写一个方法判断是否是ipad 8

以下是用Objective-C编写的判断是否是iPad 8的方法：

- (BOOL)isIPad8 {
    BOOL isIPad8 = NO;
    NSString *deviceModel = [UIDevice currentDevice].model;
    if ([deviceModel isEqualToString:@"iPad"]) {
        // 获取iPad的型号字符串
        size_t size;
        sysctlbyname("hw.machine", NULL, &size, NULL, 0);
        char *machine = malloc(size);
        sysctlbyname("hw.machine", machine, &size, NULL, 0);
        NSString *deviceString = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];
        free(machine);
        
        // 判断是否是iPad 8
        if ([deviceString isEqualToString:@"iPad13,1"] || [deviceString isEqualToString:@"iPad13,2"] || [deviceString isEqualToString:@"iPad13,3"] || [deviceString isEqualToString:@"iPad13,4"]) {
            isIPad8 = YES;
        }
    }
    return isIPad8;
}

该方法首先判断当前设备是否是iPad，然后获取设备的型号字符串，再根据iPad 8的型号字符串判断是否是iPad 8。如果是iPad 8，返回YES，否则返回NO。