From Cheddar iOS app

Block based UIView state animation

- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
	_editing = editing;
	self.textField.enabled = !_editing;
	
	void (^change)(void) = ^{		
		_textField.alpha = _editing ? 0.0f : 1.0f;
		_renameListButton.alpha = _editing ? 1.0f : 0.0f;
		if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
			if (self.frame.size.width < 500.0f) {
				_archiveTasksButton.alpha = _renameListButton.alpha;
				_archiveAllTasksButton.alpha = 0.0f;
				_archiveCompletedTasksButton.alpha = 0.0f;
			} else {
				_archiveTasksButton.alpha = 0.0f;
				_archiveAllTasksButton.alpha = _renameListButton.alpha;
				_archiveCompletedTasksButton.alpha = _renameListButton.alpha;
			}
		} else {
			_archiveTasksButton.alpha = _renameListButton.alpha;
		}
	};
	
	if (animated) {
		[UIView animateWithDuration:0.3 delay:0.0 options:UIViewAnimationCurveEaseInOut | UIViewAnimationOptionAllowUserInteraction animations:change completion:nil];
	} else {
		change();
	}
}