初次加载隐藏搜索框

FavoriteViewController.m

- (void)initSearchBar
{
    searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 44)];
    [searchBar sizeToFit];
    searchBar.placeholder = [IFI18nUtils getLocalizedString:@"SEARCH"];
    searchBar.delegate = self;
    searchBar.backgroundColor = [UIColor clearColor];
    [self.collectionView setContentInset:UIEdgeInsetsMake(-44, 0, 0, 0)];
}