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UIBarButtonItem *closeBtn = [[UIBarButtonItem alloc] initWithTitle:@"关闭" style:UIBarButtonItemStylePlain target:self action:@selector(closeAction)];

    UIBarButtonItem *backBtn = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:self action:@selector(goBackAction)];

    [self.navigationItem setLeftBarButtonItems:[NSArray arrayWithObjects: backBtn,closeBtn ,nil]];

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