ShengQianProject/YouHuiProject/YouHui/Category/UICollection...

//
//  UICollectionView+MJRefreshAutoManger.m
//  YouHuiProject
//
//  Created by 小花 on 2018/5/17.
//  Copyright © 2018年 kuxuan. All rights reserved.
//




#import "UICollectionView+MJRefreshAutoManger.h"


#define NO_MORE_DATA_TEXT @"无更多数据了"
@implementation UICollectionView (MJRefreshAutoManger)

static char stateKey;

- (void)setFootRefreshState:(MJFooterRefreshState)footRefreshState {
    
    UIWindow *window = [UIApplication sharedApplication].keyWindow;
    [RACObserve(self.mj_footer, frame)subscribeNext:^(id x) {  //这里的意思是监视mj_footer的frame变化，可以使用kvo代替RACObserve
        CGPoint point = [self convertPoint:self.mj_footer.frame.origin toView:window];
        
        if (point.y < window.frame.size.height) {
            
            [(MJRefreshAutoNormalFooter *)self.mj_footer setTitle:@"" forState:MJRefreshStateIdle];
            
        }else {
            [(MJRefreshAutoNormalFooter *)self.mj_footer setTitle:@"点击或上拉加载更多" forState:MJRefreshStateIdle];
            [(MJRefreshAutoNormalFooter *)self.mj_footer resetNoMoreData];
        }
        
    }];

    [self handleFooterRefresh:footRefreshState];
    
    NSString *value = [NSString stringWithFormat:@"%ld", (long)footRefreshState];
    objc_setAssociatedObject(self, &stateKey, value, OBJC_ASSOCIATION_COPY_NONATOMIC);
    
}

- (MJFooterRefreshState)footRefreshState {
    
    NSString *refreshState = objc_getAssociatedObject(self, &stateKey);
    if ([refreshState isEqualToString:@"MJFooterRefreshStateLoadMore"]) {
        return MJFooterRefreshStateNoMore;
    }
    else {
        return MJFooterRefreshStateLoadMore;
    }
    
}

- (void)handleFooterRefresh: (MJFooterRefreshState)footRefreshState {
    
    MJRefreshAutoNormalFooter *footer = (MJRefreshAutoNormalFooter*)self.mj_footer;
    switch (footRefreshState) {
        case MJFooterRefreshStateNormal:
        {
            [footer setTitle:@"" forState:MJRefreshStateIdle];
            break;
        }
            
        case MJFooterRefreshStateLoadMore:
        {
            [self.mj_footer endRefreshing];
            break;
        }
            
        case MJFooterRefreshStateNoMore:
        {
            [footer setTitle:NO_MORE_DATA_TEXT forState:MJRefreshStateNoMoreData];
            [self.mj_footer endRefreshingWithNoMoreData];
            break;
            
        }
        default:
            
            break;
            
    }
    
}



@end