error: Semantic Issue: Interface type cannot be statically allocated

 error: Semantic Issue: Interface type cannot be statically allocated

出现这个错误的原因是

接口声明对象时(我这么一说，大家应该懂我意思吧)，必须声明为引用，即指针

Car car = [[Car alloc] init];

改为 Car *car = [[Car alloc] init];