可可自动布局：插入（和删除）在运行时以编程视图(Cocoa Autolayout: insert (

我有可可自动布局的一些问题。我有一个窗口，我想补充（编程）一个NSTableView （其NSScrollView ）。到现在为止一切正常。我可以调整我的窗口和表正确调整大小。这是我使用的代码。

MyListViewController *viewController = [[MyListViewController alloc] initWithNibName:@"ListView" bundle:nil];

[self.mainContentView addSubview:viewController.view];
[viewController.view setTranslatesAutoresizingMaskIntoConstraints:NO];

[self.mainContentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[insertedView]|"
                                                                                 options:0
                                                                                 metrics:nil
                                                                                   views:@{@"insertedView" :viewController.view}]];
NSArray *verticalConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[insertedView]|"
                                                                           options:0
                                                                           metrics:nil
                                                                             views:@{@"insertedView" :viewController.view}];

[self.mainContentView addConstraints:verticalConstraints];

现在..我想在运行时添加（和删除）被放置在表的顶部另一种观点。视图是一个NSPredicateEditor其NSScrollView 。需要明确的是：我试图实现取景器相同的行为，当你键入搜索领域的东西，并与可能的搜索选项出现在主窗口中的视图。

我用这种方式处理这个问题：

AdvancedFilterViewController *viewController = [[AdvancedFilterViewController alloc] initWithNibName:@"AdvancedFilterView" bundle:nil];

[self.mainContentView addSubview:viewController.view];
[viewController.view setTranslatesAutoresizingMaskIntoConstraints:NO];

[self.mainContentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[insertedView]|"
                                                                             options:0
                                                                             metrics:nil
                                                                               views:@{@"insertedView" :viewController.view}]];
[self.mainContentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[insertedView(<=225)][prevView]|" // >= size of one row, <= size of 8 + 1 rows
                                                                             options:0
                                                                             metrics:nil
                                                                               views:@{@"insertedView" :viewController.view, @"prevView" : self.listView.view}]];

我想谓词（25分）是可见的，至少一条线。当用户按下加号按钮，然后更多的意见开始出现（和滚动视图应该调整其大小）。某些行（我决定9）后，滚动条应该开始出现，并在窗口中的主视图应停止萎缩。

的问题是，当我插入过滤视图，它几乎是零大小（如1点）。或者，如果我加25分的最小尺寸，视图是可见的，但添加行仅仅增加了滚动型的'内部尺寸'，所以会出现滚动条（但滚动视图不长，不会使列表视图收缩）。

我希望我正确地说明了问题。

编辑：

以灵感来自我实现委托了答案：

- (void)ruleEditorRowsDidChange:(NSNotification *)notification
{
    //handle resizing of the view
    [self.predicateEditorHeight setConstant:[self.predicateEditor numberOfRows] * self.predicateEditor.rowHeight];
}

其中self.predicateEditorHeight是一个IBOutlet对高度的限制NSScrollView 。然后在封闭NSWindowController ，当我添加谓词编辑观点我也上的比例添加约束NSTableView关于谓语视图。通过这种方式（因为我将其设置为0.3）滚动视图可以增长，直到某一点，然后，在这之后，它必须使用它的滚动条。

我仍然有一些问题的约束：例如，当我在编辑器中添加过多的行，我得到

2014-04-26 09:38:27.769 MyApp[2531:303] Unable to simultaneously satisfy constraints:
(
    "<NSLayoutConstraint:0x60000029dc40 V:[NSView:0x60000013fb80]-(0)-|   (Names: '|':NSView:0x60000013e500 )>",
    "<NSLayoutConstraint:0x60000029dbf0 V:[NSView:0x600000320b40]-(0)-[NSView:0x60000013fb80]>",
    "<NSLayoutConstraint:0x60000029dc90 NSView:0x60000013fb80.height >= 0.3*NSView:0x600000320b40.height>",
    "<NSAutoresizingMaskLayoutConstraint:0x608000288b60 h=--& v=--& V:[NSView:0x60000013e500(360)]>",
    "<NSLayoutConstraint:0x60000029dba0 V:|-(0)-[NSView:0x600000320b40]   (Names: '|':NSView:0x60000013e500 )>",
    "<NSLayoutConstraint:0x60000029d1a0 V:[NSView:0x600000320f00(275)]>",
    "<NSLayoutConstraint:0x60000029d420 V:[NSView:0x600000320f00]-(0)-|   (Names: '|':NSView:0x600000320b40 )>",
    "<NSLayoutConstraint:0x60000029d510 V:[NSView:0x600000320dc0]-(0)-[NSView:0x600000320f00]>",
    "<NSLayoutConstraint:0x60000029d330 V:|-(0)-[NSView:0x600000320dc0]   (Names: '|':NSView:0x600000320b40 )>",
    "<NSLayoutConstraint:0x60000029d060 V:[NSButton:0x6000001569a0'Search']-(4)-|   (Names: '|':NSView:0x600000320dc0 )>",
    "<NSLayoutConstraint:0x60000029d0b0 V:|-(5)-[NSButton:0x6000001569a0'Search']   (Names: '|':NSView:0x600000320dc0 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x60000029d060 V:[NSButton:0x6000001569a0'Search']-(4)-|   (Names: '|':NSView:0x600000320dc0 )>

2014-04-26 09:38:27.770 MyApp[2531:303] Unable to simultaneously satisfy constraints:
(
    "<NSLayoutConstraint:0x60000029dc40 V:[NSView:0x60000013fb80]-(0)-|   (Names: '|':NSView:0x60000013e500 )>",
    "<NSLayoutConstraint:0x60000029dbf0 V:[NSView:0x600000320b40]-(0)-[NSView:0x60000013fb80]>",
    "<NSLayoutConstraint:0x60000029dc90 NSView:0x60000013fb80.height >= 0.3*NSView:0x600000320b40.height>",
    "<NSAutoresizingMaskLayoutConstraint:0x608000288b60 h=--& v=--& V:[NSView:0x60000013e500(360)]>",
    "<NSLayoutConstraint:0x60000029dba0 V:|-(0)-[NSView:0x600000320b40]   (Names: '|':NSView:0x60000013e500 )>",
    "<NSLayoutConstraint:0x60000029d1a0 V:[NSView:0x600000320f00(275)]>",
    "<NSLayoutConstraint:0x60000029d420 V:[NSView:0x600000320f00]-(0)-|   (Names: '|':NSView:0x600000320b40 )>",
    "<NSLayoutConstraint:0x60000029d510 V:[NSView:0x600000320dc0]-(0)-[NSView:0x600000320f00]>",
    "<NSLayoutConstraint:0x60000029d330 V:|-(0)-[NSView:0x600000320dc0]   (Names: '|':NSView:0x600000320b40 )>",
    "<NSLayoutConstraint:0x60000029d100 V:|-(4)-[NSButton:0x6000001564d0]   (Names: '|':NSView:0x600000320dc0 )>",
    "<NSLayoutConstraint:0x60000029d150 V:[NSButton:0x6000001564d0]-(5)-|   (Names: '|':NSView:0x600000320dc0 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x60000029d150 V:[NSButton:0x6000001564d0]-(5)-|   (Names: '|':NSView:0x600000320dc0 )>

2014-04-26 09:38:27.775 MyApp[2531:303] Unable to simultaneously satisfy constraints:
(
    "<NSLayoutConstraint:0x60000029cf70 V:[NSTextField:0x600000198940]-(4)-|   (Names: '|':NSView:0x600000320dc0 )>",
    "<NSLayoutConstraint:0x60000029cfc0 V:|-(4)-[NSTextField:0x600000198940]   (Names: '|':NSView:0x600000320dc0 )>",
    "<NSLayoutConstraint:0x60000029dc40 V:[NSView:0x60000013fb80]-(0)-|   (Names: '|':NSView:0x60000013e500 )>",
    "<NSLayoutConstraint:0x60000029dbf0 V:[NSView:0x600000320b40]-(0)-[NSView:0x60000013fb80]>",
    "<NSLayoutConstraint:0x60000029dc90 NSView:0x60000013fb80.height >= 0.3*NSView:0x600000320b40.height>",
    "<NSAutoresizingMaskLayoutConstraint:0x608000288b60 h=--& v=--& V:[NSView:0x60000013e500(360)]>",
    "<NSLayoutConstraint:0x60000029dba0 V:|-(0)-[NSView:0x600000320b40]   (Names: '|':NSView:0x60000013e500 )>",
    "<NSLayoutConstraint:0x60000029d1a0 V:[NSView:0x600000320f00(275)]>",
    "<NSLayoutConstraint:0x60000029d420 V:[NSView:0x600000320f00]-(0)-|   (Names: '|':NSView:0x600000320b40 )>",
    "<NSLayoutConstraint:0x60000029d510 V:[NSView:0x600000320dc0]-(0)-[NSView:0x600000320f00]>",
    "<NSLayoutConstraint:0x60000029d330 V:|-(0)-[NSView:0x600000320dc0]   (Names: '|':NSView:0x600000320b40 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x60000029cf70 V:[NSTextField:0x600000198940]-(4)-|   (Names: '|':NSView:0x600000320dc0 )>

你必须“告知”父视图，该视图内将调整。我的方法是看谓语增长，通过其委托收缩：

- (void)ruleEditorRowsDidChange:(NSNotification *)notification{

  NSInteger newRowCount = [_predicateEditor numberOfRows];
  NSInteger rowHeight = [_predicateEditor rowHeight];

  // Send a notification - size changes
  NSRect newFrame = self.view.frame;
  newFrame.size.height = 30 + newRowCount*rowHeight;
  [[NSNotificationCenter defaultCenter]postNotificationName:@"RowsDidChange" object:[NSValue valueWithRect:newFrame]];
  [[_heightConstraint animator] setConstant:rowHeight*newRowCount];
}

而在父母的ViewController一个“观察员”看大小的变化：

 [[NSNotificationCenter defaultCenter]addObserverForName:@"RowsDidChange" 
    object:nil 
    queue:nil 
    usingBlock:^(NSNotification * notification){
        NSValue *value =  (NSValue*)notification.object;
        NSRect rectValue = [value rectValue];

        NSRect newContentRect = self.resultsView.frame;
        newContentRect.size.height = self.resultsView.frame.size.height - rectValue.size.height;
        newContentRect.size.width = self.resultsView.frame.size.width;

        // Set new height to the mainViewController
        [[self.mainViewController view] setFrame:newContentRect];
}];

你并不需要发送一个通知，也可以发送一些委托方法给你父视图 - 控制。

祝好运。