Is AppKit causing you frustration? Instead of just complaining about it, lets try to make it better by compiling a list of specific problems with AppKit. Leave a comment below, and I'll include it in the list.

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##NSView##
- `NSView` does not have the ability to set an affine transform.
- `NSView` and layers, although much improved in 10.8, still do not get along well. The most significant problem is with cell-based controls.

##NSViewController##
- `NSViewController` could be more useful. It has `-loadView` but no other lifecycle methods.

##NSClipView##
- `NSClipView` has performance issues.
	- [`RBLClipView`](https://github.com/github/Rebel/blob/master/Rebel/RBLClipView.h) attempts to fix this.
	
##NSTableView##
- `NSTableView` has odd animation artifacts when scrolling with the keyboard with a fast key repeat.
- `NSTableView` does not fully support sections – all rows in the table are numbered sequentially, rather than as (section #, row #) as `UITableView` does. This makes it difficult to alter sections independently.

##NSCollectionView##
- `NSCollectionView` has no view recycling, poor API design, and is quite lacking compared to `UICollectionView`.

##NSBrowser##
- `NSBrowser` is not view-based like `NSTableView` and `NSOutlineView`.

##NSSlider##
- `NSSlider` requires use of private method `-_usesCustomTrackImage` in order to completely customize appearance.
- `NSSlider` needs a "rounded textured" style for use in window frames.

##NSSearchField##
- `NSSearchField` does not support tokens.

##NSTextField##
- `NSTextField` doesn't support a custom context menu when the text is selectable and/or editable. It requires hacking around with the field editor to implement this functionality.

##NSSplitView##
- `NSSplitView` has a lacking API. Simple customization like setting priorities and min/max sizes for views is unnecessarily complex.

##NSProgressIndicator##
- `NSProgressIndicator` still draws the original progress bar even if drawing is overridden.
- `NSProgressIndicator`'s color cannot be changed without workarounds such as Core Image filters.

##NSPopover##
- `NSPopover` does not offer a way to customize its appearance apart from the two default styles. 
	- [`RBLPopover`](https://github.com/github/Rebel/blob/master/Rebel/RBLPopover.h) attempts to fix this.
- `NSPopover` steals keyboard focus.

##NSWindow##
- `NSWindow` animation is poor without the use of some not-so-nice hacks.
- Borderless `NSWindows` (`NSBorderlessWindowMask`) do not have the ability to round their corners.
- Borderless `NSWindows` with a layer-backed content view do not get a shadow.
- `NSWindow` is really difficult to customize.
	- [`INAppStoreWindow`](https://github.com/indragiek/INAppStoreWindow) attempts to fix this.
	
##NSDocument##
- `NSDocument` has very bad support for documents that aren't fully loaded into memory. Nearly all of the API assumes that you can generate a singular `NSData` object to store your document in, which isn't true if half of your document is on disk only and the other half in memory only.
- `NSPersistentDocument` doesn't support file wrappers (bundles), even though that's a requirement for the sqlite data storage with sandboxing enabled. All workarounds at this point are huge hacks.

##NSObjectController##
- While `NSObjectController` and its subclasses (e.g. `NSArrayController`) support retrieving objects from a Core Data managed object context, they do not offer a way to receive per-change notifications. This means that you need to reload your entire view vs. inserting/removing/moving the cells that were updated. Ideally, we would want a port of NSFetchedResultsController.

##NSDrawer##
- `NSDrawer` should either be deprecated or have its API fully updated to support customization.

##NSImage##
- `NSImage` does not support drawing stretchable images with caps.
	- [`RBLResizableImage`](https://github.com/github/Rebel/blob/master/Rebel/RBLResizableImage.h) attempts to fix this.

##Field Editors##
- Field editors are conceptually unusual and confusing.

##Cells & Controls##
- The use of cells in specific controls such as `NSTextField` and `NSButton` make them difficult to customize.
- `NSButtonCell` is poorly thought out. `bezelStyle`,` gradientType`, `buttonType`, `isHighlighted`, `state` and a few more make for a really really confusing subclassing experience.
- `NSTextFieldCell` does not have vertically-centered text. A subclass is required.
- Template images and window-style engraved text should be useable without the use of captive cells.
- AppKit controls need image-based customization properties like their UIKit counterparts.
- AppKit does not provide HUD-styled controls. 
	- [`SNRHUDKit`](https://github.com/indragiek/SNRHUDKit) attempts to fix this.
- Interface Builder does not support bindings for custom controls.

##Misc. (not necessarily AppKit)###
- There is no Cocoa wrapper for the Carbon hotkeys API.
- There is no Cocoa wrapper for `FSEvents`. The Spotlight stuff doesn't really work for sandboxed Applications.
- There is no API for AirPlay.