objective-c - 在 UIViewController 上设置只读 navigationController 属性以进行模拟

Question

我使用 OCMock 创建了一个模拟的 UINavigationController。但是，我无法将它分配给 UIViewController 的 navigationController 属性，因为该属性是只读的。

id mockNavController = [OCMockObject mockForClass:[UINavigationController class]];
...
myViewController.navigationController = mockNavController; // readonly!

作者 this blog post声称已找到解决方案但忽略了分享。

Answer 1

不必创建允许您设置 navigationController 属性的更改器，因为您可以模拟返回它的访问器。以下是我的做法:

-(void)testTappingSettingsButtonShouldDisplaySettings {
    MyController *myController = [[MyController alloc] init];

    // expect the nav controller to push a settings controller
    id mockNavigationController = [OCMockObject mockForClass:[UINavigationController class]];
    [[mockNavigationController expect] pushViewController:[OCMArg any] animated:YES];

    // set up myController to return the mocked navigation controller
    id mockController = [OCMockObject partialMockForObject:myController];
    [[[mockController expect] andReturn:mockNavigationController] navigationController];

    [myController settingsButtonTapped];

    [mockNavigationController verify];
    [mockController verify];
    [myController release];
}