YiRefresh
a simple way to use pull-to-refresh.
implement by KVO,support UITableView，UICollectionView，UIWebView.
YiRefresh Support iOS7+，horizontal and vertical screen，iPhone and iPad.
Podfile
platform :ios, '7.0'
pod "YiRefresh", "~> 0.9.5"header drop down to refresh
refreshHeader=[[YiRefreshHeader alloc] init];
refreshHeader.scrollView=tableView;
[refreshHeader header];
typeof(refreshHeader) __weak weakRefreshHeader = refreshHeader;
refreshHeader.beginRefreshingBlock=^(){
typeof(weakRefreshHeader) __strong strongRefreshHeader = weakRefreshHeader;
[strongRefreshHeader endRefreshing];
};
[refreshHeader beginRefreshing];
footer pull up to refresh
refreshFooter=[[YiRefreshFooter alloc] init];
refreshFooter.scrollView=tableView;
[refreshFooter footer];
typeof(refreshFooter) __weak weakRefreshFooter = refreshFooter;
refreshFooter.beginRefreshingBlock=^(){
typeof(weakRefreshFooter) __strong strongRefreshFooter = weakRefreshFooter;
[strongRefreshFooter endRefreshing];
};
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