block捕获变量的几道测试题

第一题

    NSInteger age = 20;
    void(^block)() = ^(){
        NSLog(@"%li",age);//打印的值为几
    };
    age = 40;
    block();

第二题

    SCPerson *person = [[SCPerson alloc]init];
    person.age = 20;
    void(^block)() = ^(){
        NSLog(@"%li",person.age);//打印的值为几
    };
    person.age = 40;
    block();

第三题

    SCPerson *person = [[SCPerson alloc]init];
    person.age = 20;
    void(^block)() = ^(){
        NSLog(@"%li",person.age);//打印的值为几
    };
    person = [[SCPerson alloc]init];
    person.age = 40;
    block();

第四题

    SCPerson *person = [[SCPerson alloc]init];
    person.age = 20;
    __weak SCPerson *weakPerson = person;
    void(^block)() = ^(){
        NSLog(@"%li",weakPerson.age);//打印的值为几
    };
    person = [[SCPerson alloc]init];
    person.age = 40;
    block();

第五题

    SCPerson *person = [[SCPerson alloc]init];
    person.age = 20;
    __weak SCPerson *weakPerson = person;
    void(^block)() = ^(){
        __strong SCPerson *strongPerson = weakPerson;
        NSLog(@"%li",strongPerson.age);//打印的值为几
    };
    person = [[SCPerson alloc]init];
    person.age = 40;
    block();