單元測試與NSUndoManager，Runloop - Obj-C

Question

我想用一個撤消管理器測試一些代碼，但顯然，撤消的時候在同一個運行循環中運行時分組。我試圖關閉groupsByEvent，但它不能按預期工作。

- (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; 
} 

，並在我的測試，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 

但代碼運行時，我總是回來：「沒有了」 - 當撤消發生時，它總是運行所有撤消的背...因爲它們是在同一個循環中添加的。

我只想測試我的撤消是否正在進行測試......和想法？

也許強迫運行循環在每次更改後觸發？更改運行循環模式？

任何幫助歡迎。

謝謝，克里斯

Answer 1

啊，這似乎工作，雖然看起來不是最好的。

[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]); 
    }); 
});