面试被问到的一个题,觉得自己牛逼的进来

请说出NSLog输出的内容

    NSString *name1 = [NSString stringWithFormat:@"CoderZNBmm"];
    __weak NSString *name2 = name1;
    NSLog(@"name1:%@", name1);
    NSLog(@"name2:%@", name2);
    name1 = nil;
    NSLog(@"name1:%@", name1);
    NSLog(@"name2:%@", name2);

    NSString *a1 = [[NSString alloc] initWithFormat:@"CoderZNBmm"];
    __weak NSString *a2 = a1;
    NSLog(@"a1:%@", a1);
    NSLog(@"a2:%@", a2);
    a1 = nil;
    NSLog(@"a1:%@", a1);
    NSLog(@"a2:%@", a2);

    NSString *b1 = @"CoderZNBmm";
    __weak NSString *b2 = b1;
    NSLog(@"b1:%@", b1);
    NSLog(@"b2:%@", b2);
    b1 = nil;
    NSLog(@"b1:%@", b1);
    NSLog(@"b2:%@", b2);

当把__weak 换成 __strong 后结果又是怎样

再看看下面的情况

 NSObject *obj1=[[NSObject alloc] init];
    __strong NSObject *obj2 = obj1;
    NSLog(@"%@,%@", obj1, obj2);
    obj1 = nil;
    NSLog(@"%@,%@", obj1, obj2);

    NSObject *obj3=[[NSObject alloc] init];
    __weak NSObject *obj4 = obj3;
    NSLog(@"%@,%@", obj3, obj4);
    obj3 = nil;
    NSLog(@"%@,%@", obj3, obj4);

我当时一脸懵逼,心想其中肯定有诈.怎么办呢...
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几分钟后,结果被玩坏了.😂