objective-c - IOS非ARC下 的 下面代码因为什么内存泄露，给个修改方案~plz

Question

    NSObject *obj1 = [[NSObject alloc]init];
    NSObject *obj2 = [[NSObject alloc]init];
   
    obj1 = [obj2 retain];
    [obj1 release];
    [obj2 release];

Answer 1

This sentence in obj1 = [obj2 retain]; points the pointer of obj1 to obj2, so obj1The space that it originally pointed to was no longer taken care of, so it was leaked. obj1 = [obj2 retain];这一句，把obj1的指针指到obj2那块儿去了，所以obj1原来指的那块空间就没人管了，就泄漏了。

所以单就这个问题而言是obj1 = [obj2 retain];前面就要[obj1 release];

So as far as this issue is concerned, obj1 = [obj2 retain]; needs to be preceded by [obj1 release];. As for what it should be in terms of engineering specifications, I don’t know. It's clear, I haven't written much about non-ARC. If it’s not for an interview, try to use ARC. 🎜