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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