iOS - 如何检查是否存在模态视图

Question

有没有办法检查是否存在模态视图？我想仅在存在模态视图时才运行方法.此外,如果我有多个模态视图,有没有办法检查是否存在某个模态视图.

我使用以下代码来呈现和消除模态视图:

    [self presentModalViewController:myModalView animated:YES];
    [self dismissModalViewControllerAnimated:YES];

先感谢您!

干杯,埃文

PS.我的模态视图有一个视图控制器,但是我想检查模态视图是否存在于异步运行的单独类中.

Answer 1

您是否从父视图控制器检查模态视图控制器的存在？如果是这样,你可以检查视图控制器的modalViewController属性:

BOOL modalPresent = (self.modalViewController);

如果要检查特定的模态视图控制器,可以获得模态视图控制器的类名,如下所示:

NSString *modalClassName = NSStringFromClass([self.modalViewController class]);

Answer 2

您可以使用:self.presentedViewController,返回The view controller that is presented by this view controller, or one of its ancestors in the view controller hierarchy.

Answer 3

对我有用的是:

// this is the trick: set parent view controller as application's window root view controller
UIApplication.sharedApplication.delegate.window.rootViewController = viewController;

// assert no modal view is presented
XCTAssertNil(viewController.presentedViewController);

// simulate button tap which shows modal view controller
[viewController.deleteButton sendActionsForControlEvents:UIControlEventTouchUpInside];

// assert that modal view controller is presented
XCTAssertEqualObjects(viewController.presentedViewController.class, MyModalViewController.class);

据我测试,这适用于iOS7和iOS8.但是没试过iOS6.