iOS-设置导航栏

UINavigationBar *navi = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 20, [UIScreen mainScreen].bounds.size.width, 44)];

UIBarButtonItem *myButton = [[UIBarButtonItem alloc]
                initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
                             target:self
                             action:@selector(back)];

UIBarButtonItem *myButton2 = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemSave
             target:self
             action:@selector(Save)];

UINavigationItem *navigationItem = [[UINavigationItem alloc] initWithTitle:@""];
navigationItem.leftBarButtonItem = myButton;
navigationItem.rightBarButtonItem = myButton2;

navi.items = @[navigationItem];

[self.view addSubview:navi];