iOS 多层级的immutable objects 转换成 mutable objects

第一种方法是：将多层级的递归转换

方法；

+(id) recursiveMutable:(id)object

{

if([object isKindOfClass:[NSDictionary class]])

{

NSMutableDictionary* dict = [NSMutableDictionary dictionaryWithDictionary:object];

for(NSString* key in [dict allKeys])

{

[dict setObject:[App recursiveMutable:[dict objectForKey:key]] forKey:key];

}

return dict;

}

else if([object isKindOfClass:[NSArray class]])

{

NSMutableArray* array = [NSMutableArray arrayWithArray:object];

for(int i=0;i<[array count];i++)

{

[array replaceObjectAtIndex:i withObject:[App recursiveMutable:[array objectAtIndex:i]]];

}

return array;

}

else if([object isKindOfClass:[NSString class]])

return [NSMutableString stringWithString:object];

return object;

}





测试：

NSDictionary* testDict = [NSDictionary dictionaryWithObjectsAndKeys:[NSDictionary dictionaryWithObject:@"Test" forKey:@"Key"],@"A",[NSArray arrayWithObjects:@"1",[NSNumber numberWithInt:2],@"3",nil],@"B",@"Test String",@"C",nil];

NSMutableDictionary* testMutableDict = [App recursiveMutable:testDict];

 

// Test A

[[testMutableDict objectForKey:@"A"] setObject:@"Test2" forKey:@"Key2"];

[[[testMutableDict objectForKey:@"A"] objectForKey:@"Key"] appendString:@" -- This Works"];

// Test B

[[testMutableDict objectForKey:@"B"] addObject:@"4"];

// Test C

[[testMutableDict objectForKey:@"C"] appendString:@" - Just testing NSMutableString again"];

NSLog(@"testMutableDict = %@",testMutableDict);

结果：

testMutableDict = { A = { Key = “Test — This Works”; Key2 = Test2; }; B = ( 1, 2, 3, 4 ); C = “Test String – Just testing NSMutableString again”; }





第二种：

使用coreFoundation框架里的CFPropertyListCreateDeepCopy，使用选项kCFPropertyListMutableContainersAndLeaves，意思是深度mutable

非ARC使用：

NSArray *immutableArray = [JSON objectForKey:@"result"];

self.myMutableArray = [(NSMutableArray *)CFPropertyListCreateDeepCopy(NULL, immutableArray, kCFPropertyListMutableContainersAndLeaves) autorelease];

ARC使用：

CFBridgingRelease(CFPropertyListCreateDeepCopy(NULL, (__bridge CFPropertyListRef)(immutableArray), kCFPropertyListMutableContainersAndLeaves))

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