UiButton / IBAction - 从一个RootView链接到Storyboard中的mainView [英] UiButton / IBAction - link from a RootView to mainView in Storyboard

问题描述

我尝试在故事板上调用主 ViewController 。在我的应用程序中，还有一个 .h ， .m 文件，没有xib或故事板。

I try to call the main ViewController on my storyboard. In my app there is a additional .h, .m file with no xib or storyboard.

在这个.m文件中，我有一个按钮：

In this .m file T craeted a button:

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:@selector(home:)forControlEvents:UIControlEventTouchDown];
[button setTitle:@"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[self.view addSubview:button];
NSLog(@"Home-Button line 645");

此按钮应链接到Storyboard中的主ViewController。该视图具有标识符HauptMenu。我没有错误，但视图没有改变到我的主ViewController。有什么问题？

This button should link to my main ViewController in the Storyboard. The view has the identifier HauptMenu. I got no error, but the view doesnt change to my main ViewController. What is wrong?

    - (IBAction)home:(id)sender {
    NSLog(@"Button was tapped");
    ViewController *viewController = [self.storyboard instantiateViewControllerWithIdentifier:@"HauptMenu"];

    NSLog(@"1");
    [viewController setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];
    NSLog(@"2");
    [self.navigationController pushViewController:viewController animated:NO];
    [viewController release];
    NSLog(@"3");

}

推荐答案

如果你的话 .m 文件与任何故事板无关，不会 self.storyboard 是无？

If your .m file is not associated with any storyboard, wouldn't self.storyboard be Nil?

尝试：

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:
                               @"MainStoryboard" bundle:[NSBundle mainBundle]];
ViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"HauptMenu"];

确保将 storyboardWithName：更改为无论你的故事板是什么名字。

Make sure to change the storyboardWithName: to whatever your storyboard is named.

你可能没有任何错误，因为Objective-C的处理方式与其他语言不同，如果你尝试在nil上调用一个方法，它（通常）不会抛出异常，它只返回nil。以下代码将很乐意运行，不会抛出任何编译器或运行时错误：

You may not have gotten any errors because Objective-C handles nil differently than other languages, it (usually) won't throw an exception if you try to call a method on nil, it will just return nil. The following code will happily run, throwing no compiler or runtime errors:

UIViewController * test = nil;
[test viewDidLoad];

---

---

NSString * storyBoardName;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
    storyBoardName = @"MainStoryboard_iPad";
} else {
    storyBoardName = @"MainStoryboard_iPhone";
}
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:
                                   storyBoardName bundle:[NSBundle mainBundle]];
ViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"HauptMenu"];

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