BFScrollMenu

A UIViewController extension category that manipulate a view which associated with a scroll view.

Demo

User case:

When you need a menu view do corresponding action when scrolling up or down the scrolling view (which mostly it is a table view), you can use UIViewController+BFScroll category to accomplish it. For example, if you want to hide the menu view when scrolling up and show it again when scrolling down.

Usage:

It is very simple to use this category. Just setup it in your viewcontroller using corresponding blocks using the setting-up method:

	- (void)setUpDelegateClass:(Class _Nonnull)delegateClass
MenuView:(UIView * _Nonnull )menuView
conditionBlock:(BFConditionBlock _Nullable)condition
scrollActionBlock:(BFActionBlock _Nullable)scrollAction
stopActionBlock:(BFActionBlock _Nullable)stopAction;

For example:

// create your menu view ...
self.menuView = [[UIView alloc] initWithFrame:CGRectMake(0, 21, [UIScreen mainScreen].bounds.size.width, 80)];
...
// create your block ...
BFActionBlock stop = ^(BFScrollingDirection lastDirection) {
// ...
};
BFActionBlock scroll = ^(BFScrollingDirection lastDirection) {
if (lastDirection == BFScrollingDirectionUP) {
// animating hiding the menu view ... ;
}
elseif (lastDirection == BFScrollingDirectionDown) {
// animating showing the menu view ...
}
};
// Set up
[selfsetUpDelegateClass:[selfclass] MenuView:self.menuView conditionBlock:nilscrollActionBlock:scroll stopActionBlock:nil];