浅拷贝,深拷贝---ios
#import <Foundation/Foundation.h> @interface Father : NSObject <NSCopying,NSMutableCopying> @property (nonatomic,copy) NSString *name; @property (nonatomic,retain) NSNumber *age; -(id) initWithName:(NSString *)name withAge:(NSNumber *) age; @end
#import "Father.h" #import "Child.h" @implementation Father -(id) initWithName:(NSString *)name withAge:(NSNumber *) age{ self=[super init]; if(self!=nil){ _name=name; _age=age; } return self; } //浅拷贝 -(id) copyWithZone:(NSZone *)zone{ Father *father=[[[self class] allocWithZone:zone] init]; father.name=_name; father.age=_age; return father; } //深拷贝 - (id)mutableCopyWithZone:(NSZone *)zone{ Father *father=[[[self class] allocWithZone:zone] init]; father.name=[_name mutableCopy]; father.age=[_age copy]; return self; }
NSLog(@"-------自定义对象浅拷贝---------"); //浅拷贝学习 Father *father=[[Father alloc] initWithName:@"caitou" withAge:[NSNumber numberWithInt:23]]; Father *father2=[father copy]; NSLog(@"对象地址:%p",father); NSLog(@"对象地址:%p",father2); NSLog(@"对象属性地址name:%p",[father name]); NSLog(@"对象属性地址name:%p",[father2 name]); NSLog(@"对象属性地址age:%p",[father age]); NSLog(@"对象属性地址age:%p",[father2 age]); NSLog(@"--------自定义对象深拷贝---------"); //深拷贝 Father *father4=[[Father alloc] initWithName:@"caitou" withAge:[NSNumber numberWithInt:25]]; Father *father3=[father4 mutableCopy]; NSLog(@"对象地址:%p",father4); NSLog(@"对象地址:%p",father3); NSLog(@"对象属性地址name:%p",[father4 name]); NSLog(@"对象属性地址name:%p",[father3 name]); NSLog(@"对象属性地址age:%p",[father4 age]); NSLog(@"对象属性地址age:%p",[father3 age]); NSLog(@"-------浅拷贝---------"); NSArray *array1=[[NSArray alloc] initWithObjects:@"sdf", nil]; NSArray *array2=[array1 copy]; NSLog(@"%p",array1); NSLog(@"%p",array2); NSLog(@"-------深拷贝---------"); NSMutableArray *mutableArray=[NSMutableArray arrayWithObject:@"sdfdf" ]; NSMutableArray *mutableArray2=[mutableArray mutableCopy]; NSLog(@"%p",mutableArray); NSLog(@"%p",mutableArray2); //总结:当copy一个不可变对象时,相当有retain,即引用记数加一,其他情况copy,mutablecopy都会分配空间复制内容
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