应用程序试图以模态方式呈现一个主动控制器 ios
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原文地址: http://stackoverflow.com/questions/19895049/
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Application tried to present modally an active controller ios
提问by
I was trying to set the ViewController with a parent view controller before it shows show that it can provide call backs, I done this using PrepareForSegue
我试图在显示它可以提供回调之前使用父视图控制器设置 ViewController，我使用 PrepareForSegue
- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"newQuarter"])
{
[segue.destinationViewController setParentViewController:self];
}
}
It crashed giving me the error message: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present modally an active controller.
它崩溃了，给我错误消息： Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present modally an active controller.
So I tried using another method and set up a new view controller on the button touches up,
所以我尝试使用另一种方法并在按钮上设置一个新的视图控制器，
- (IBAction) buttonClicked
{
NewViewController *newController = [[NewViewController alloc] init];
[newController setParentViewController:self];
[self presentViewController:newController animated:YES completion:nil];
}
but with no luck it is still giving me the same error message, can anyone please advice? Thanks!
但没有运气它仍然给我同样的错误信息，有人可以请教吗？谢谢！
采纳答案by
Resolved the problem, since the parent view controller is a tableViewController, which it was embedded in a navigationViewController. That's why the segue should be pushed rather then performing modal transition.
解决了这个问题，因为父视图控制器是一个tableViewController，它被嵌入在一个navigationViewController. 这就是为什么应该推动 segue 而不是执行模态转换。
回答by Sebastian Dwornik
I had the same issue and Matthew's explanation seems correct.
我有同样的问题，马修的解释似乎是正确的。
Replace:
代替：
[self presentViewController:newController animated:YES completion:nil];
with:
和：
[self.navigationController pushViewController:newController animated:YES];
回答by Chris Halcrow
This line:
这一行：
[self presentViewController:newController animated:YES completion:nil];
will perform a MODAL segue, which is what gives the error.
将执行 MODAL segue，这就是导致错误的原因。
Using this line instead:
改用这一行：
[self.navigationController pushViewController:newController animated:YES];
performs a segue by 'PUSHING' a new view controller onto the Navigation Controller stack (in XCode 6 and above, this is the same thing as defining a segue type of 'show' on the storyboard). This is why you need this when you're using a Navigation Controller.
通过将新的视图控制器“推”到导航控制器堆栈上来执行转场（在 XCode 6 及更高版本中，这与在情节提要上定义“显示”的转场类型相同）。这就是为什么在使用导航控制器时需要它的原因。
