创建按钮 ，添加到导航栏

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UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonItemStylePlain target:self action:@selector(cancel:)];    self.navigationItem.leftBarButtonItem = cancelButton;    [cancelButton release];

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上面@select()对应的cancel:

- (IBAction)cancel:(id)sender {    [self.navigationController popViewControllerAnimated:YES];}