klx_teacher/KulexiuForTeacher/KulexiuForTeacher/Common/Tools/GifRefresh/KSGifRefreshFooter.m

//
//  KSGifRefreshFooter.m
//  StudentDaya
//
//  Created by Kyle on 2021/10/15.
//  Copyright © 2021 DayaMusic. All rights reserved.
//

#import "KSGifRefreshFooter.h"
#import <Lottie/Lottie.h>

@interface KSGifRefreshFooter ()

@property(nonatomic, strong) LOTAnimationView *loadingView;
@property(nonatomic, strong) NSString *jsonString;

@end

@implementation KSGifRefreshFooter

- (instancetype)init {
    if (self = [super init]) {
        [self setJsonName:@"teacher_refresh"];
    }
    return self;
}

- (void)setJsonName:(NSString *)jsonName {
    self.jsonString = jsonName;
    [self addSubview:self.loadingView];
}

- (LOTAnimationView *)loadingView {
    if(_loadingView == nil) {
        //1.加载本地json
        _loadingView = [LOTAnimationView animationWithFilePath:[[NSBundle mainBundle] pathForResource:self.jsonString ofType:@"json"]];
        //2.加载后台给的json(url)
        _loadingView.frame = CGRectMake(([UIScreen mainScreen].bounds.size.width / 2.0) - 21, 0, 42, 55);
        _loadingView.loopAnimation = YES;
        _loadingView.contentMode = UIViewContentModeScaleAspectFill;
        _loadingView.animationSpeed = 1.0;
        _loadingView.loopAnimation = YES;
    }
    return _loadingView;
}

#pragma mark - innerMethod
- (void)endRefreshing {
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [super endRefreshing];
    });
}

#pragma mark - 监听控件的刷新状态

- (void)setState:(MJRefreshState)state {
    MJRefreshCheckState;
    if(self.jsonString.length > 0) {
        switch (state) {
            case MJRefreshStateIdle: //普通闲置状态
            {
                [self.loadingView stop];
                //self.loadingView.hidden = YES;
                break;
            }
            case MJRefreshStatePulling: //松开就可以进行刷新的状态
            {
                //self.loadingView.hidden = NO;
            }
                break;

            case MJRefreshStateRefreshing: //正在刷新中的状态
            {
                self.loadingView.animationProgress = 0;
                [self.loadingView play];
            }
                break;
            default:
                break;
        }
    }
}

#pragma mark - 实时监听控件 scrollViewContentOffset

- (void)scrollViewContentOffsetDidChange:(NSDictionary *)change {
    [super scrollViewContentOffsetDidChange:change];
    if(self.jsonString.length > 0) {
        CGPoint point;
        id newVelue = [change valueForKey:NSKeyValueChangeNewKey];
        [(NSValue *)newVelue getValue:&point];
        
        //id newVelue1 = [change objectForKey:NSKeyValueChangeNewKey];
        //CGPoint point1 = ((NSValue *)newVelue1).CGPointValue;//可以取值
        
        //id newVelue2 = [change objectForKey:@"new"];
        //CGPoint point2 = *((__bridge CGPoint *)(newVelue2));//无法取到值
        
        self.loadingView.hidden = !(self.pullingPercent);
        CGFloat progress = point.y / ([UIScreen mainScreen].bounds.size.height / 3.0);
        if(self.state != MJRefreshStateRefreshing) {
            self.loadingView.animationProgress = -progress;
        }
    }
}

- (void)prepare {
    [super prepare];
    // 设置控件的高度
        self.mj_h = 55;
    // 初始化文字
    [self setTitle:@"" forState:MJRefreshStateIdle];
    [self setTitle:@"" forState:MJRefreshStatePulling];
    [self setTitle:@"" forState:MJRefreshStateRefreshing];
    [self setTitle:[NSBundle mj_localizedStringForKey:MJRefreshBackFooterNoMoreDataText] forState:MJRefreshStateNoMoreData];
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

@end