Memory Management of primary

最新推荐文章于 2025-05-23 08:11:03 发布

置顶 huhuahua6

最新推荐文章于 2025-05-23 08:11:03 发布

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本文链接：https://blog.youkuaiyun.com/huhuahua6/article/details/38564917

本文详细解析了Objective-C中内存管理的基本原则，包括alloc、retain、copy、release等关键字的作用，并通过实例展示了如何使用引用计数管理对象生命周期。

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 //内存管理基本原则:
    //如果你对一个对象进行alloc,retain,copy.之后,你就拥有了该对象的所有权,你就必须对它进行release或者autorelease.
    @autoreleasepool {
        //alloc开辟内存空间,并且将对象的引用计数由0变1.
        Person *per1 = [[Person alloc] init];//0 - 1
        //retainCount用来获得当前对象的引用计数
        NSLog(@"%lu",[per1 retainCount]);
        //retain将对象的引用计数加1.
        Person *per2 = [per1 retain];//1 - 2
        NSLog(@"%lu",[per1 retainCount]);
        [per2 retain];//2 - 3
        NSLog(@"%lu",[per1 retainCount]);
        [per1 retain];//3 - 4
        NSLog(@"%lu",[per1 retainCount]);
        NSLog(@"%lu",[per2 retainCount]);
        //release 将对象的引用计数-1;
        [per2 release];//4 - 3
        NSLog(@"%lu",[per2 retainCount]);
        [per2 release];//3 - 2
        NSLog(@"%lu",[per2 retainCount]);
        [per2 release];//2 - 1
        NSLog(@"%lu",[per2 retainCount]);
        [per2 release];//1 - 0