iOS面试题中的self 与 super

@implementation Son
- (instancetype)init{
    if (self = [super init]) {
        NSLog(@"%@",NSStringFromClass([self class]));
        NSLog(@"%@",NSStringFromClass([self superclass]));
        NSLog(@"%@",NSStringFromClass([super class]));
        
    }
    return self;
}
@end

这个问题主要是 self 和super

self refers to the object receiving a message in objective-C programming.

super is a flag that tells the compiler to search for the method implementation in a very different place. It begins in the superclass of the class that defines the method where super appears.

self 是从当前类开始找 super 是从 父类开始找。最后接受者 都是当前对象。所以返回的是一样的。

最后都返回 son father son

2. @property 默认的数据类型

@property NSMutableArray *arr ;
@property int zz;

对应基本数据类型，默认关键字为
atomic, assign, readwrite
对应对象类型，默认关键字为
atomic, strong, readwrite
atomic 与 nonatomic 区别 读写安全。
atomic 确保 读写安全。会在set 之后读取数据。若多线程同时set 不确保最后读取数据的准确性。