Objective-C 对象复制 简单实现是本文要介绍的内容,也行对Objective-C 也不算陌生了,我们先来看内容。
Foundation系统对象(NSString,NSArray等)
只有遵守NSCopying 协议的类才可以发送copy消息
只有遵守 NSMutableCopying 协议的类才可以发送mutableCopy消息
copy和mutableCopy区别就是copy返回后的是不能修改的对象, 而mutableCopy返回后是可以修改的对象。
这个两个方法复制的对象都需要手动释放。
自义定义Class
自义定Class也需要实现NSCopying协义或NSMutableCopying协议后,其对象才能提供copy功能。代码
- //TestProperty.h
- #import <Cocoa/Cocoa.h>
- @interface TestProperty : NSObject <NSCopying>{
- NSString *name; NSString *password;
- NSMutableString *interest;
- NSInteger myInt;}@property (retain,nonatomic)
- NSString *name,*password;
- @property (retain,nonatomic) NSMutableString *interest;
- @property NSInteger myInt;
- -(void) rename:(NSString *)newname;
- @end//TestProperty.m
- #import "TestProperty.h"
- @implementation TestProperty
- @synthesize name,password,interest;
- @synthesize myInt;
- -(void) rename:(NSString *)newname{
- // 这里可以直接写成
- // self.name = newname;
- // if (name != newname) {
- [name autorelease];
- name = newname;
- [name retain];
- }
- }
- -(void) dealloc{
- self.name = nil;
- self.password = nil;
- self.interest = nil;
- [super dealloc];}- (id)copyWithZone:(NSZone *)zone{
- TestProperty *newObj = [[[self class] allocWithZone:zone] init];
- newObj.name = name;
- newObj.password = password;
- newObj.myInt = myInt;
- //深复制 NSMutableString *tmpStr = [interest mutableCopy];
- newObj.interest = tmpStr;
- [tmpStr release];
- //浅复制 //newObj.
- interestinterest = interest;
- return newObj;
- }
- @end
小结:Objective-C 对象复制 简单实现的内容介绍完,希望本文对你有所帮助!