LeftBarButtonItems,定制导航栏返回按钮

    UIBarButtonItem *closeBtn = [[UIBarButtonItemalloc] initWithTitle:@"关闭"style:UIBarButtonItemStylePlaintarget:selfaction:@selector(closeAction)];

    UIBarButtonItem *backBtn = [[UIBarButtonItemalloc] initWithTitle:@"返回"style:UIBarButtonItemStylePlaintarget:selfaction:@selector(goBackAction)];

    [self.navigationItemsetLeftBarButtonItems:[NSArrayarrayWithObjects: backBtn,closeBtn ,nil]];

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