iOS利用MJRefresh实现自定义刷新动画效果

#import "MJRefresh.h"
//自定义一个方法实现
- (void)prepareRefresh
{
 NSMutableArray *headerImages = [NSMutableArray array];
 for (int i = 1; i <= 4; i++) {
  UIImage *image = [UIImage imageNamed:[NSStringstringWithFormat:@"topload%d",i]];
  [headerImages addObject:image];
 }
 MJRefreshGifHeader *gifHeader = [MJRefreshGifHeaderheaderWithRefreshingBlock:^{
//下拉刷新要做的操作.
 }];
 gifHeader.stateLabel.hidden = YES;
 gifHeader.lastUpdatedTimeLabel.hidden = YES;
 [gifHeader setImages:@[headerImages[0]]forState:MJRefreshStateIdle];
 [gifHeader setImages:headerImages forState:MJRefreshStateRefreshing];
 _tableView.header = gifHeader;
 NSMutableArray *footerImages = [NSMutableArray array];
 for (int i = 1; i <= 4; i++) {
  UIImage *image = [UIImage imageNamed:[NSStringstringWithFormat:@"footerload%d",i]];
  [footerImages addObject:image];
 }
 MJRefreshAutoGifFooter *gifFooter = [MJRefreshAutoGifFooterfooterWithRefreshingBlock:^{
//上拉加载需要做的操作.
 }];
 gifFooter.stateLabel.hidden = YES;
 gifFooter.refreshingTitleHidden = YES;
 [gifFooter setImages:@[footerImages[0]]forState:MJRefreshStateIdle];
 [gifFooter setImages:footerImages forState:MJRefreshStateRefreshing];
 _tableView.footer = gifFooter;
}

  [_tableView.header endRefreshing];//下拉刷新数据完成时写上
  [_tableView.footer endRefreshing];//上拉加载数据完成时写上