iOS 内存管理~自定义对象的拷贝

//联系人:石虎  QQ: 1224614774昵称:嗡嘛呢叭咪哄

一、浅拷贝

首先创建Person.h和Person.m,实现<NSCopying>协议

#Person.h

@interface Person : NSObject <NSCopying>

@property (nonatomic,copy) NSString *name;

@end

#Person.m

@implementation Person

@synthesize name;

//实现copyWithZone方法

- (id)copyWithZone:(NSZone *)zone {

    Person *p = [[self class] allocWithZone:zone];

    p.name = [self name];

    return p;

}

@end

二、测试浅拷贝

Person* person = [[Person alloc] init];

[person setName:@"leo"];

NSArray* arr1 = [[NSArray alloc] initWithObjects:person,@"AA", @[@"AA" ], [NSMutableArray arrayWithObjects:@"AA",nil], nil];

NSArray* arr2 = [[NSArrayalloc] initWithArray:arr1];

NSArray* arr3 = [[NSArrayalloc] initWithArray:arr1copyItems:YES];

[person setName:@"lily"];

//尝试更改name的值

//获取两个数组里的各自Person对象

Person* p1 = [arr1 objectAtIndex:0];

Person* p2 = [arr2 objectAtIndex:0];

Person* p3 = [arr3 objectAtIndex:0];

NSLog(@"arr1 :%p 非集合 :%p 不可变集合 :%p 可变集合 :%p", arr1, arr1[1], arr1[2], arr1[3]);

NSLog(@"arr2 :%p 非集合 :%p 不可变集合 :%p 可变集合 :%p", arr2, arr2[1], arr2[2], arr2[3]);

NSLog(@"arr3 :%p 非集合 :%p 不可变集合 :%p 可变集合 :%p", arr3, arr3[1], arr3[2], arr3[3]);

NSLog(@"p1:%p  name:%@", p1, p1.name);

NSLog(@"p2:%p  name:%@", p2, p2.name);

NSLog(@"p3:%p  name:%@", p3, p3.name);

arr1 :0x100404520 非集合 :0x100002090 不可变集合 :0x1004040a0 可变集合 :0x100404230

arr2 :0x100404630 非集合 :0x100002090 不可变集合 :0x1004040a0 可变集合 :0x100404230

arr3 :0x100404790 非集合 :0x100002090 不可变集合 :0x1004040a0 可变集合 :0x100404780

p1:0x1004006b0  name:lily

p2:0x1004006b0  name:lily

p3:0x100404090  name:leo

谢谢!!!