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. The list will be sorted according to the number of comments for a problem.

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- The use of cells in specific controls such as `NSTextField` and `NSButton` make them difficult to customize.
- AppKit controls need image-based customization properties like their UIKit counterparts.
- `NSTableView` has odd animation artifacts when scrolling with the keyboard with a fast key repeat.
- `NSCollectionView` has no view recycling, poor API design, and is lacking compared to `UICollectionView`.
- `NSClipView` has performance issues. *([`RBLClipView`](https://github.com/github/Rebel/blob/master/Rebel/RBLClipView.h) attempts to fix this)*
- `NSWindow`s are really difficult to customize. *([`INAppStoreWindow`](https://github.com/indragiek/INAppStoreWindow) attempts to fix this)*.
- `NSWindow` animation is poor without the use of some not-so-nice hacks.
- `NSViewController` could be more useful. It has `-loadView` but no other lifecycle methods.
- `NSBrowser` is not view-based like `NSTableView` and `NSOutlineView`.
- `NSSplitView` has a lacking API. Simple customization like setting priorities and min/max sizes for views is unnecessarily complex.
- AppKit does not provide HUD-styled controls. *([`SNRHUDKit`](https://github.com/indragiek/SNRHUDKit) attempts to fix this)*
- `NSSlider` requires use of private method `-_usesCustomTrackImage` in order to completely customize appearance.
- `NSProgressIndicator` still draws the original progress bar even if drawing is overridden.
- `NSTextFieldCell` does not have vertically-centered text. A subclass is required.
- Interface Builder does not support bindings for custom controls.