1 )上拉加载 MJRefreh三方库
-(void)headAdd
{
NSInteger num = 0;
NSString *str = [NSString stringWithFormat:@"http://open4.bantangapp.com/topic/list",++num];
[self.collectionView addFooterWithCallback:^{
[ReadAsync readAsyncWithwebStr:str parmater:nil block:^(NSData *data) {
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
NSDictionary *dic1 = [dic objectForKey:@"data"];
NSArray *array = [dic1 objectForKey:@"topic"];
for (NSDictionary *dictionary in array) {
ReadModel *model = [[ReadModel alloc]init];
[model setValuesForKeysWithDictionary:dictionary];
[self.imageArray addObject:model];
}
[self.collectionView reloadData];
}];
[self.collectionView footerEndRefreshing];
}];
}
2). 下拉刷新 ;在数据解析的block里移除存放数据的数组里的元素;下拉刷新只舒心第一页的数据
-(void)footRefesh
{
// 添加下拉刷新头部控件
[self.collectionView addHeaderWithCallback:^{
[ReadAsync readAsyncWithwebStr:@“http://baidu.com“ parmater:nil block:^(NSData *data) {
[self.imageArray removeAllObjects];
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
NSDictionary *dic1 = [dic objectForKey:@"data"];
NSArray *array = [dic1 objectForKey:@"topic"];
for (NSDictionary *dictionary in array) {
ReadModel *model = [[ReadModel alloc]init];
[model setValuesForKeysWithDictionary:dictionary];
[self.imageArray addObject:model];
}
[self.collectionView reloadData];
}];
// 结束刷新
[self.collectionView headerEndRefreshing];
}];
#pragma mark --自动刷新(一进入程序就下拉刷新)
[self.collectionView headerBeginRefreshing];
}
关于页面的下拉刷新,和上拉加载 --- > collectionView ,tableView
原文：http://www.cnblogs.com/fan-cong/p/4878414.html