从非ECSlidingViewController打开ECSlidingViewController

Question

我曾尝试在IBAction上访问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"];

}

我得到以下错误：

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

我在按钮上尝试了一个模式动作，“touchupinside”会落在InitialViewController上。对此有什么建议吗？

Answer 1

您需要将定义slidingViewController的行移到if-else-if子句下面，因为在当前执行的位置，故事板将为空。

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"];