iOS/Objective-C开发 字典NSDictionary的深复制

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#import <Foundation/Foundation.h>

@interface NSDictionary (MutableDeepCopy)
-(NSMutableDictionary *)mutableDeepCopy;
//增加mutableDeepCopy方法
@end

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#import "NSDictionary+MutableDeepCopy.h"

@implementation NSDictionary (MutableDeepCopy)
-(NSMutableDictionary *)mutableDeepCopy
{
NSMutableDictionary *dict=[[NSMutableDictionary alloc] initWithCapacity:[self count]];
//新建一个NSMutableDictionary对象，大小为原NSDictionary对象的大小
NSArray *keys=[self allKeys];
for(id key in keys)
{//循环读取复制每一个元素
id value=[self objectForKey:key];
id copyValue;
if ([value respondsToSelector:@selector(mutableDeepCopy)]) {
//如果key对应的元素可以响应mutableDeepCopy方法(还是NSDictionary)，调用mutableDeepCopy方法复制
copyValue=[value mutableDeepCopy];
}else if([value respondsToSelector:@selector(mutableCopy)])
{
copyValue=[value mutableCopy];
}
if(copyValue==nil)
copyValue=[value copy];
[dict setObject:copyValue forKey:key];

}
return dict;
}
@end

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#import <Foundation/Foundation.h>
#import "NSDictionary+MutableDeepCopy.h"
//导入头文件
int main (int argc, const char * argv[])
{

@autoreleasepool {
NSMutableArray *arr1=[[NSMutableArray alloc] initWithObjects:@"aa",@"bb",@"cc", nil];
NSDictionary *dict1=[[NSDictionary alloc] initWithObjectsAndKeys:arr1,@"arr1", nil];
NSLog(@"%@",dict1);
NSMutableDictionary *dict2=[dict1 mutableCopy];
//浅复制
NSMutableDictionary *dict3=[dict1 mutableDeepCopy];
//深复制
[arr1 addObject:@"dd"];
NSLog(@"%@",dict2);
NSLog(@"%@",dict3);

}
return 0;
}