MJRefresh下拉视图自定义--回弹效果

11.gif

头文件

#import  

#import  

//下拉刷新控件

@interface ZZZRefreshHeader : MJRefreshHeader

@end

实现文件

#define MIN_HEIGHT 50.0

@interface ZZZRefreshHeader()

@property (nonatomic,strong) UIView *cuteView;

@property (nonatomic, strong) CAShapeLayer *shapeLayer;

@property (nonatomic,strong) LOTAnimationView *animateBegin;

@property (nonatomic,strong) LOTAnimationView *animateLoading;

@end

@implementation ZZZRefreshHeader

#pragma mark - 重写方法

#pragma mark 在这里做一些初始化配置（比如添加子控件）

- (void)prepare

{

    [super prepare];

    self.layer.zPosition = -1;

    // 设置自动切换透明度(在导航栏下面自动隐藏)

    self.mj_h = MIN_HEIGHT;

    self.cuteView = [[UIView alloc]init];

    self.cuteView.backgroundColor = RGBCOLOR(246, 247, 248);

    [self addSubview:self.cuteView];

    self.animateBegin.hidden = NO;

    self.animateLoading.hidden = NO;

    [self configShapeLayer];

}

#pragma mark 在这里设置子控件的位置和尺寸

- (void)placeSubviews

{

    [super placeSubviews];

    self.cuteView.frame = CGRectMake(0, 0, self.mj_w, MIN_HEIGHT);

}

-(LOTAnimationView *)animateBegin

{

    if (_animateBegin == nil) {

        _animateBegin = [LOTAnimationView animationNamed:@"loadbegin"];

        _animateBegin.loopAnimation = NO;

        _animateBegin.frame = CGRectMake(0, 0, 50, 50);

        [self addSubview:_animateBegin];

//        [self addSubview:self.testView];

    }

    return _animateBegin;

}

-(LOTAnimationView *)animateLoading

{

    if (_animateLoading == nil) {

        _animateLoading = [LOTAnimationView animationNamed:@"loading"];

        _animateLoading.loopAnimation = YES;

        _animateLoading.frame = CGRectMake(0, 0, 50, 50);

        [self addSubview:_animateLoading];

    }

    return _animateLoading;

}

- (void)configShapeLayer

{

    _shapeLayer = [CAShapeLayer layer];

    _shapeLayer.fillColor = RGBCOLOR(246, 247, 248).CGColor;

    [self.cuteView.layer addSublayer:_shapeLayer];

}

- (void)updateShapeLayerPath:(CGFloat)offsetY

{

    // 更新_shapeLayer形状

    UIBezierPath *tPath = [UIBezierPath bezierPath];

    [tPathmoveToPoint:CGPointMake(0, 0)];                              // r1点

    [tPathaddLineToPoint:CGPointMake(self.cuteView.width, 0)];            // r2点

    [tPathaddLineToPoint:CGPointMake(self.cuteView.width,  MIN_HEIGHT)];  // r4点

    [tPathaddQuadCurveToPoint:CGPointMake(0, MIN_HEIGHT)

                  controlPoint:CGPointMake(self.cuteView.width/2, -offsetY)]; // r3,r4,r5确定的一个弧线

    [tPathclosePath];

    _shapeLayer.path = tPath.CGPath;

}

#pragma mark 监听scrollView的contentOffset改变

- (void)scrollViewContentOffsetDidChange:(NSDictionary *)change

{

    [super scrollViewContentOffsetDidChange:change];

    CGPoint nPoint = [[change objectForKey:@"new"] CGPointValue];

//    DLog(@"contentOffset改变:%@,,%f",change,nPoint.y);

    CGFloat animateY = 0;

    if (nPoint.y + MIN_HEIGHT <= 0) {

        self.cuteView.y = nPoint.y + MIN_HEIGHT;

        animateY = nPoint.y + MIN_HEIGHT + MIN_HEIGHT/2;

    }else{

        self.cuteView.y = 0;

        animateY =MIN_HEIGHT+nPoint.y/2;

    }

    [self updateShapeLayerPath:nPoint.y];

    self.animateLoading.center = CGPointMake(self.mj_w/2, animateY);

    self.animateBegin.center = self.animateLoading.center;

    if (nPoint.y == 0) {

        [UIView animateWithDuration:0.1 animations:^{

            self.animateBegin.center = CGPointMake(self.animateBegin.center.x, self.animateBegin.centerY - 25);

        }];

    }

}

#pragma mark 监听scrollView的contentSize改变

- (void)scrollViewContentSizeDidChange:(NSDictionary *)change

{

    [super scrollViewContentSizeDidChange:change];

}

#pragma mark 监听scrollView的拖拽状态改变

- (void)scrollViewPanStateDidChange:(NSDictionary *)change

{

    [super scrollViewPanStateDidChange:change];

//    DLog(@"拖拽状态改变:%@",change);

}

#pragma mark 监听控件的刷新状态

- (void)setState:(MJRefreshState)state

{

    MJRefreshCheckState;

    // 根据状态做事情

    if (state == MJRefreshStateIdle) {

        if (oldState == MJRefreshStateRefreshing) {

            self.animateBegin.hidden = NO;

            self.animateLoading.hidden = YES;

            [self.animateLoading pause];

        }else if( oldState == MJRefreshStatePulling) {

            self.animateBegin.hidden = NO;

            self.animateLoading.hidden = YES;

            [self.animateLoading pause];

        }else{

            self.animateBegin.hidden = YES;

            self.animateLoading.hidden = YES;

            [self.animateLoading pause];

        }

    }else if (state == MJRefreshStatePulling) {

        self.animateBegin.hidden = NO;

        self.animateLoading.hidden = YES;

        [self.animateLoading pause];

    }else if (state == MJRefreshStateRefreshing) {

        self.animateBegin.hidden = YES;

        self.animateLoading.hidden = NO;

        self.animateLoading.animationProgress = 0;

        [self.animateLoading play];

    }else{

        self.animateBegin.hidden = YES;

        self.animateLoading.hidden = YES;

    }

}

#pragma mark 监听拖拽比例（控件被拖出来的比例）

- (void)setPullingPercent:(CGFloat)pullingPercent

{

    [super setPullingPercent:pullingPercent];

//    DLog(@"当前进度：%f",pullingPercent);

    CGFloat progressBegin = pullingPercent - 1 > 0 ? 1.0:pullingPercent;

    self.animateBegin.animationProgress = progressBegin*0.64;

}

@end

其中有使用到动画框架 《Lottie》

勉强可以使用，但是赶脚还是有不少问题，请各位大佬指正

问题1：在UICollectionView 使用的时候，添加的视图会超出header，使用了各种方法，层次还是有点问题。

问题2：当在UINavigationController中使用时，如果标题栏隐藏，会出现视图错位。

持续修复中....