1. 先说结论：

分可变对象、不可变对象、自定义对象、容器对象几种：

例子参考： iOS开发——深拷贝与浅拷贝详解
注解：

1. 所有mutableCopy都是深拷贝，所以只需要记住不可变对象和容器对象(其实就是不可变对象)是浅拷贝就行了
2. 另外要注意得到对象的类型，有一种最特殊，就是可变对象copy之后得到的是个不可变对象，所以一个NSMutableString类型的property，一般应该用strong关键字
3. 容器对象的深拷贝只是对象本身深拷贝，其元素依然是浅拷贝，如NSMuatableArray *array1，对其调用copy或者mutableCopy，都是生成一个新的对象，但里边元素的地址是不变的，如下边示例2

示例1：可变对象copy的例子

    NSMutableString *mutString = [NSMutableString stringWithString:@"abc"];
    NSMutableString *copyString = [mutString copy];
    NSMutableString *mutableCopyString = [mutString mutableCopy];
    NSLog(@"mutString:%p,copyString:%p,mutableCopyString:%p",mutString,copyString,mutableCopyString);
    [copyString appendString:@"aaaa"];  //此处会引发崩溃

2018-03-21 15:03:55.706167+0800 iOSLearnigDemo[89468:8764272] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSTaggedPointerString appendString:]: unrecognized selector sent to instance 0xa000000006362613'

示例2：容器对象copy的例子

    // 容器对象
    NSArray *array = [NSArray arrayWithObject:@(1)];
    NSArray *copyArray = [array copy];
    NSMutableArray *mutableCopyArray = [array mutableCopy];
    NSLog(@"array:%p,copyArray:%p,mutableCopyArray:%p",array,copyArray,mutableCopyArray);
    // 可变容器对象
    NSMutableArray *mutableArray = [NSMutableArray arrayWithObject:@(2)];
    NSArray *copyMutableArray = [mutableArray copy];
    NSArray *mutableCopyMutableArray = [mutableArray mutableCopy];
    NSLog(@"mutableArray:%p,copyMutableArray:%p,mutableCopyMutableArray:%p",mutableArray,copyMutableArray,mutableCopyMutableArray);
    // 打印新array中元素的地址，由下图可见元素地址都是相同的，所以深拷贝只拷贝对象本身，其元素依然是浅拷贝
    NSLog(@"mutableArray obj:%p,copyMutableArray obj:%p,mutableCopyMutableArray obj:%p",mutableArray.firstObject,copyMutableArray.firstObject,mutableCopyMutableArray.firstObject);
    

2018-03-21 15:07:27.414277+0800 iOSLearnigDemo[89534:8778488] array:0x600000015870,copyArray:0x600000015870,mutableCopyArray:0x60000024b340
2018-03-21 15:07:27.415237+0800 iOSLearnigDemo[89534:8778488] mutableArray:0x60000024ee80,copyMutableArray:0x6000000158e0,mutableCopyMutableArray:0x600000252cf0
2018-03-21 15:07:27.416033+0800 iOSLearnigDemo[89534:8778488] mutableArray obj:0xb000000000000022,copyMutableArray obj:0xb000000000000022,mutableCopyMutableArray obj:0xb000000000000022

2. 自定义对象

要支持copy与mutableCopy，需要实现NSCopying,NSMutableCopying协议，用法如下：
(Foundation框架对象都实现了该协议，所以可以直接使用copy与mutableCopy，UIKit框架不可以)

@interface Person()<NSCopying,NSMutableCopying>
@end
@implementation Person

- (id)copyWithZone:(NSZone *)zone{
    Person *person = [Person allocWithZone:zone];
    person.name = self.name;
    person.year = self.year;
    return person;
}

- (id)mutableCopyWithZone:(NSZone *)zone{
    Person *person = [Person allocWithZone:zone];
    person.name = self.name;
    person.year = self.year;
    return person;
}
@end 
   // 简单的调用代码
    Person *person = [[Person alloc] init];
    person.name = @"luofuzhong";
    person.year = 26;
    Person *copyPerson = [person copy];
    Person *mutableCopyPerson = [person mutableCopy];
    NSLog(@"person:%p,copyPerson:%p,mutableCopyPerson:%p",person,copyPerson,mutableCopyPerson);

输出结果如下：

2018-03-21 14:42:04.214203+0800 iOSLearnigDemo[89280:8704219] person:0x60000023df20,copyPerson:0x60000023edc0,mutableCopyPerson:0x60000023f820