modal一个导航控制器

    //modal一个发微博的控制器    ComposeViewController *compose = [[ComposeViewController alloc] init];    CustomNavigationController *nav = [[CustomNavigationController alloc] initWithRootViewController:compose];    [self presentViewController:nav animated:YES completion:nil];

#import "ComposeViewController.h"@interface ComposeViewController ()@end@implementation ComposeViewController- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor whiteColor];        self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"取消" style:UIBarButtonItemStyleDone target:self action:@selector(cancel)];}- (void)cancel{    [self dismissViewControllerAnimated:YES completion:nil];}@end