在需要滑动隐藏/显示的页面中：
@property(nonatomic,assign)CGFloat historyY;
#pragma mark Delegate
//设置滑动的判定范围
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
if (historyY+20<targetContentOffset->y)
{
[self setTabBarHidden:YES];
}
else if(historyY-20>targetContentOffset->y)
{
[self setTabBarHidden:NO];
}
historyY=targetContentOffset->y;
}
//隐藏显示tabbar
- (void)setTabBarHidden:(BOOL)hidden
{
UIView *tab = self.tabBarController.view;
CGRect tabRect=self.tabBarController.tabBar.frame;
if ([tab.subviews count] < 2) {
return;
}
UIView *view;
if ([[tab.subviews objectAtIndex:0] isKindOfClass:[UITabBar class]]) {
view = [tab.subviews objectAtIndex:1];
} else {
view = [tab.subviews objectAtIndex:0];
}
if (hidden) {
view.frame = tab.bounds;
tabRect.origin.y=[[UIScreen mainScreen]bounds].size.height+self.tabBarController.tabBar.frame.size.height;
} else {
view.frame = CGRectMake(tab.bounds.origin.x, tab.bounds.origin.y, tab.bounds.size.width, tab.bounds.size.height);
tabRect.origin.y=[[UIScreen mainScreen] bounds].size.height-self.tabBarController.tabBar.frame.size.height;
}
[UIView animateWithDuration:0.5f animations:^{
self.tabBarController.tabBar.frame=tabRect;
}completion:^(BOOL finished) {
}];
}
