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[HTOne]

// 5. Present a navigation controller
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:searchViewController];
[self presentViewController:nav animated:YES completion:nil];

改成 [self.navigationController presentViewController:searchViewController animated:YES completion:nil]; 报错 reason: 'Application tried to present modally an active controller <UINavigationController: 0x7ffd44832a00>.

[ko1o]

@HTOne 这是你使用问题 UINavigationController 不能modal出一个控制器