Manually implement the Nstabviewcontroller Rect Transition and Propagate title-b

I don't know why, when I set the TAB view Controller's Transition property in Storyboard in OS X 10.11.5 and Xcode 7.3, the tab view Controller does not automatically follow the sub view C Ontroller's Preferred Content Size is used to animate gradients, so it can only be implemented on its own (including Propagate Title).

Current Storyboard settings:
Remember to turn off Propagate title because it doesn't have any use on my build, and it also affects the subsequent manual setting of the title via Delegate.

Step 1:
Subclass Tabview Controller, here is JZSettingsTabViewController , plus NSTabViewDelegate .

Step 2:
Implement the Protocol,

- (void)updateWindowSizeWithItem:(NSTabViewItem *)item{    NSWindow *window = self.view.window;    NSSize contentSize = item.viewController.preferredMinimumSize;    NSSize newWindowSize = [window frameRectForContentRect:(CGRect){CGPointZero, contentSize}].size;    NSRect frame = [window frame];    frame.origin.y += frame.size.height;    frame.origin.y -= newWindowSize.height;    frame.size = newWindowSize;    [self.view.window setFrame:frame display:YES animate:YES];    window.title = item.label;}

Step 3:
Since the above is preferredMinimumSize obtained by the size, then in the child View Controller implementation file Add this sentence, this time do not write Preferred Content Size:

- (CGSize)preferredMinimumSize{    return CGSizeMake(500, 400);}

Although this Size is not through the Storyboard set up a little too troublesome, but considering the Tabview Controller of each sub-VC is sure to achieve, also can be.
I'm here because I'm going to write the Setup interface so I use the Nstabviewcontroller and keep the window size fixed (by removing nsresizablewindowmask), if you need a window that can be Resize and keep tabs different The size of the switch animation,

NSSize contentSize = item.viewController.preferredMinimumSize;  

This sentence can be modified appropriately, such as the expected size after the current stretch.

Manually implement the Nstabviewcontroller Rect Transition and Propagate title-b