QQ20200601-161232-HD.gif

属性

//刷新模块
@property(nonatomic,strong)LOTAnimationView *lottieView;
@property(nonatomic,assign)MJRefreshState refreshState;

初始化

self.refreshState = MJRefreshStateIdle;

懒加载

- (LOTAnimationView *)lottieView
{
    if (!_lottieView) {
        LOTAnimationView *view = [LOTAnimationView animationNamed:@"222-trail-loading"];
        view.loopAnimation = YES;
        view.contentMode = UIViewContentModeScaleAspectFit;
        _lottieView = view;
    }
    return _lottieView;
}
//放到头部 所以这里自由发挥一下吧
[tableHeaderView addSubview:self.lottieView];
[self.lottieView mas_makeConstraints:^(MASConstraintMaker *make) {
    make.left.right.mas_equalTo(0);
    make.bottom.mas_equalTo(0);
    make.height.mas_equalTo(100*ADAPTER_WIDTH);
}];

ScrollViewDidScroll方法

CGFloat offset = scrollView.contentOffset.y + scrollView.contentInset.top;
//刷新
/**
 普通闲置状态
 MJRefreshStateIdle = 1,
 松开就可以进行刷新的状态
 MJRefreshStatePulling,
 正在刷新中的状态
 MJRefreshStateRefreshing,
 即将刷新的状态
 MJRefreshStateWillRefresh,
 所有数据加载完毕，没有更多的数据了
 MJRefreshStateNoMoreData

 1.isDragging = YES 是拖拽的时候 松手isDragging = NO
 */
if (offset < 0) {
    CGFloat pullingOffset = kStatusBarHeight;
    CGFloat offsetY = fabs(offset);
    if (scrollView.isDragging) {
        //拖拽
        if (offsetY >= pullingOffset) {
            //->刷新的状态
            if (self.refreshState == MJRefreshStateIdle) {
                self.refreshState = MJRefreshStatePulling;
            }
            //刷新状态-刷新动画
            if (self.refreshState == MJRefreshStatePulling) {
                CGFloat moreY = offsetY - pullingOffset;
                CGFloat percent = (moreY / 50*ADAPTER_WIDTH);
                percent = percent - floor(percent);
                percent = MIN(percent, 1);
                if (percent > 0.1) {
                    self.lottieView.hidden = NO;
                } else {
                    self.lottieView.hidden = YES;
                }
                self.lottieView.animationProgress = percent;
            }
        } else {
            //恢复默认状态
            if (self.refreshState == MJRefreshStatePulling) {
                self.refreshState = MJRefreshStateIdle;
                self.lottieView.hidden = YES;
                self.lottieView.animationProgress = 0;
            }
        }
    } else {
        //松手
        if (self.refreshState == MJRefreshStatePulling) {
            self.refreshState = MJRefreshStateRefreshing;
            self.lottieView.hidden = NO;
            [self.lottieView play];
            [self loadNewData];
            //添加一个setContentOffset
            CGFloat refreshContentOffsetY = kStatusBarHeight;
            [scrollView setContentOffset:CGPointMake(0, - (refreshContentOffsetY)) animated:YES];
        }
    }
} else {
    //动画进行时 下滑解决
    if (offset > 50*ADAPTER_WIDTH) {
        self.refreshState = MJRefreshStateIdle;
        self.lottieView.hidden = YES;
        self.lottieView.animationProgress = 0;
        [self.lottieView pause];
    }
}

停止刷新

- (void)endRefresh
{
    self.refreshState = MJRefreshStateIdle;
    self.lottieView.hidden = YES;
    self.lottieView.animationProgress = 0;
    [self.lottieView pause];
    //只有刷新后偏移量和设定一直才恢复偏移量为0
    CGFloat refreshContentOffsetY = kStatusBarHeight;
    if (fabs(self.mainView.contentOffset.y) == refreshContentOffsetY) {
        [self.mainView setContentOffset:CGPointMake(0, - (0*ADAPTER_WIDTH)) animated:YES];
    }
}