当我想从一个VC跳转到另一个VC的时候,一般会用 - (void)presentViewController:(UIViewController *)viewControllerToPresent animated: (BOOL)flag completion:(void (^)(void))completion;当然也可以用导航push. 有时会遇到了此类警告:Warning: Attempt to present on whose view is not in the window hier…
系统:mac OS 10.12 (16A323) Xcod:8.3.3 错误:Warning: Attempt to present <UIAlertController: 0x7fd192806e20> on <ViewController: 0x7fd1928048d0> whose view is not in the window hierarchy! 原因:今天写UIalerCortoller 出现此错误,查找得资料这是个经典的 错误,在往后日子里面都会遇到类似问题,这…
昨天写豆瓣发广播Demo的时候,为了写Demo的简单,就使用了Storyboard,结果执行视图跳转时遇到了这个问题: Warning: Attempt to present <UINavigationController: 0x8d514e0> on <OAuthViewController: 0xa044a60> whose view is not in the window hierarchy! 其功能是OAuthViewController用于用户授权,在获取用户的授权后将…
Warning: Attempt to present (要被presented的控制器) on (哪个控制器来presenting) which is already presenting (已经被presenting的控制器) self: 是被presented出来的控制器, self.presentingViewController: 看看是谁把self给presenting出来 RPLog(@"%@ - %@", self.presentingViewController,…
做的是二维码扫描,扫描后识别为URL的话就跳转到webview 加载网页,用的是代理传值的方式.扫描到了 值传递到主页 扫描窗体退出,检测值是否是http://开头 是网页就跳转. 问题出在传值到主界面后判断网页链接再跳转的时候 出现Attempt to present on whose view is not in the window hierarchy的错误,也就是传值回去的时候主视图还没打开又要打开浏览视图 然后就乱掉了 不知道要打开啥了. 尝试诸多方法之后找到以下方法: 在扫描结果之后…
解决方法: /* I think this is because in iOS 8, alert views and action sheets are actually presented view controllers (UIAlertController). So, if you're presenting a new view controller in response to an action from the UIAlertView, it's being presented w…
当 storyboard里面的 按钮 即连接了 类文件里面的点击方法 又 连接了 storyboard里 另一个 控制器的 modal 就会出现类似Attempt to present <TestViewController2: 0x7fd7f8d10f30> on <ViewController: 0x7fd7f8c054c0> whose view is not in the window hierarchy!的错误 ,意思是说系统尝试present一个没有在wi…
