[_tableViewaddObserver:selfforKeyPath:@"contentOffset"options:NSKeyValueObservingOptionNewcontext:nil];
-(void)observeValueForKeyPath:(NSString*)keyPath ofObject:(id)object change:(NSDictionary*)change context:(void*)context
{
if([keyPathisEqualToString:@"contentOffset"])
{
CGPointnewOffset = [change[@"new"]CGPointValue];
[selfupdateSubViewsWithScrollOffset:newOffset];
}
}
-(void)updateSubViewsWithScrollOffset:(CGPoint)newOffset{
//吸顶效果float destinaOffset = -50;
floatdestinaOffset =0;
floatstartChangeOffset = -_tableView.contentInset.top;
newOffset =CGPointMake(newOffset.x, newOffset.y<startChangeOffset?startChangeOffset:(newOffset.y>destinaOffset?destinaOffset:newOffset.y));
floatnewY = -newOffset.y-_tableView.contentInset.top+kNavBarHeight;
_headView.frame=CGRectMake(0, newY,_headView.frame.size.width,_headView.frame.size.height);
}
