Question

我尝试使用撤消管理器测试某些代码，但显然，当在同一个运行循环中运行时，撤消会被分组。我试过关闭groupsByEvent，但它没有按预期工作。

- (NSString *)article
{
    return _article == nil ? @"no article" : _article;
}
- (void)setarticle:(NSString *)article
{

    if (_undoManager)
    {
        [(ModelGraph *)[_undoManager prepareWithInvocationTarget:self] setarticle:self.article];
        [_undoManager setActionarticle:@"undo set article"];
    }

    NSCharacterSet *charactersToRemove = [[NSCharacterSet alphanumericCharacterSet] invertedSet];
    article = [[article componentsSeparatedByCharactersInSet:charactersToRemove] componentsJoinedByString:@""];

    _article = article;
}

在我的测试中我有：

undoManager = [[NSUndoManager alloc] init];
myObject.undoManager = undoManager;

[myObject setArticle:@"Article 1"];
[myObject setArticle:@"Article 2"];
[myObject setArticle:@"Article 3"];
[myObject setArticle:@"Article 4"];
[undoManager undo];

NSLog(@"myObject.article: %@", [myObject article]); //prints noarticle

但是当代码运行时，我总会回来：＆＃34;没有文章＆＃34; - 当撤消发生时，它总是运行所有撤消...因为它们被添加到同一个runloop中。

我只想测试我的撤消是否正在使用测试......和想法？

也许在每次更改后强制运行循环？更改运行循环模式？

欢迎任何帮助。

谢谢，克里斯

Answer 1

啊，这似乎有用，但看起来并不是最好的。

[undoManager setGroupsByEvent:NO];
[undoManager beginUndoGrouping];

dispatch_async (dispatch_get_main_queue(), ^{


    [myObject setArticle:@"Article 1"];

    [undoManager endUndoGrouping];

    [undoManager beginUndoGrouping];


    dispatch_async (dispatch_get_main_queue(), ^{
        [myObject setArticle:@"Article 2"];

        [undoManager endUndoGrouping];

        [undoManager undo];
        NSLog(@"myObject.article: %@", [myObject article]);
    });
});

使用NSUndoManager进行单元测试，Runloop - Obj-C

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