创造按钮 ，添加到导航栏
创建按钮 ，添加到导航栏
UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonItemStylePlain target:self action:@selector(cancel:)];
self.navigationItem.leftBarButtonItem = cancelButton;
[cancelButton release];
上面@select()对应的cancel:
- (IBAction)cancel:(id)sender {
[self.navigationController popViewControllerAnimated:YES];
}