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尝试以模态方式呈现UIViewController,但它仅与pushviewconttoller语句一起工作。UIViewController尝试以模态呈现
[navigationController pushViewController:_viewController animated:YES];
随着presentModalViewController声明它只显示导航栏是它没有完成按钮甚至不是UIView的
[navigationController presentModalViewController:self.viewController animated:YES];
这是为什么?