OC中的 copy 和 mutableCopy

集合类

OC中的集合类 字典 数组 字符串 set

对于可变类型

 NSMutableArray *names = [NSMutableArray arrayWithObjects:@"tian",@"zhang",nil];
 NSMutableArray *namesCopy = [names copy];
 NSMutableArray *namesMutableCopy = [names mutableCopy];
 NSLog(@"%p %p %p",names,namesCopy,namesMutableCopy);

结果：0x100600fb0 copy:0x100601ad0 mutableCopy:0x100601af0

对于不可变类型

 NSArray *names = [NSArray arrayWithObjects:@"tian",@"zhang",nil];
 NSArray *namesCopy = [names copy];
 NSArray *namesMutableCopy = [names mutableCopy];
 NSLog(@"%p copy:%p mutableCopy:%p",names,namesCopy,namesMutableCopy);

结果：0x100500c30 copy:0x100500c30 mutableCopy:0x100500f50

总结

1.对集合类可变结合类型 浅拷贝 和 深拷贝 都是深拷贝
2.对于集合类不可变类型浅 即 浅 深即深
3.对于非集合类型 同第二条