Error : "Use of undeclared identifier 'CFTree'"

Question

I am creating tree in iOS application using CFTree. I am getting error "Use of undeclared identifier 'CFTree'". What I am missing? My code :

#import "ViewController.h"
#import <CoreFoundation/CoreFoundation.h>

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    CFTree tree = CreateMyTree(kCFAllocatorDefault);
}

static CFTreeRef CreateMyTree(CFAllocatorRef allocator) {
    NSString *info = @"Bhushan is great";
    CFTreeContext ctx;
    ctx.version = 0;
    ctx.info = (__bridge void *)(info);
    ctx.retain = CFRetain;
    ctx.release = CFRelease;
    ctx.copyDescription = NULL;
    return CFTreeCreate(allocator, &ctx);
}

Answer 1

The type is CFTreeRef, not CFTree:

CFTreeRef tree = CreateMyTree(kCFAllocatorDefault);

Answer 2

Try this:

NSString *info;
CFTreeContext ctx;

NSString *treeString = [[NSString alloc] initWithFormat:@"the tree string"];
info = treeString;

ctx.info = (__bridge void *)(info);
CFTreeRef myTree = CFTreeCreate(NULL, &ctx);

this is the link:Create a CFTree in Objective C