ios 系统导航

1.隐藏返回键的按钮

[self.navigationController.navigationItem setHidesBackButton:YES];

[self.navigationItem setHidesBackButton:YES];

[self.navigationController.navigationBar.backItem setHidesBackButton:YES];

2.设置系统右边的按钮

UIButton * butCancel = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 50, 50)];

[butCancel setTitle:@"取消" forState:UIControlStateNormal];

[butCancel setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

[butCancel addTarget:self action:@selector(clickCancelBut) forControlEvents:UIControlEventTouchUpInside];

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:butCancel];