ios - 从非 ECSlidingViewController 打开 ECSlidingViewController

Question

我尝试在 IBAction 上达到 ECSlidingViewController。但是，当我尝试以下代码时：

-(IBAction)openNewPage:(id)sender{ //IV

UIStoryboard *storyboard;
ECSlidingViewController *slidingViewController = (ECSlidingViewController *)[storyboard instantiateViewControllerWithIdentifier:@"IV"];
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
    storyboard = [UIStoryboard storyboardWithName:@"iPhone" bundle:nil];
} else if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
    storyboard = [UIStoryboard storyboardWithName:@"iPad" bundle:nil];
}

slidingViewController.topViewController = [storyboard instantiateViewControllerWithIdentifier:@"FirstTop"];

}

我收到以下错误：

 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'

我在按钮上尝试了模态操作，“touchupinside”将落在 InitialViewController 上。对此有何建议？

Answer 1

您需要将定义 slipViewController 的行移到 if-else-if 子句下方，因为情节提要在您当前执行的位置将为零。

UIStoryboard *storyboard;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
    storyboard = [UIStoryboard storyboardWithName:@"iPhone" bundle:nil];
} else if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
    storyboard = [UIStoryboard storyboardWithName:@"iPad" bundle:nil];
}
ECSlidingViewController *slidingViewController = (ECSlidingViewController *)[storyboard instantiateViewControllerWithIdentifier:@"IV"];
slidingViewController.topViewController = [storyboard instantiateViewControllerWithIdentifier:@"FirstTop"];