IOS 滑动手势冲突 判断滑动方向

最近在写百度地图的时候发现地图和scrollView和tableView的滑动手势会冲突，这里以百度地图作为示例写一遍解决方法

首先遵循UIGestureRecognizerDelegate代理方法

然后在你需要禁止滑动的scrollView添加手势

// 给第一个tableView添加手势
UIGestureRecognizer *mainScrollVTap = [[UIGestureRecognizer alloc]init];
mainScrollVTap.delegate=self;
[scroAll addGestureRecognizer:mainScrollVTap];

// 给最底部的scrollview 添加手势
UIGestureRecognizer *mainScrollVTap = [[UIGestureRecognizer alloc]init];
mainScrollVTap.delegate=self;
[scroAll addGestureRecognizer:mainScrollVTap];

在地图上添加点击手势

_mapView = [[BMKMapView alloc]initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, PTTotalHeight/5*2)];
_mapView.userTrackingMode = BMKUserTrackingModeFollow;//设置定位的状态
_mapView.delegate = self;
_mapView.showsUserLocation = YES;//显示定位图层
[scroRoute addSubview:_mapView];
//给地图加手势以解决滑动冲突
UITapGestureRecognizer *provinceMapTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(provinceMapTapped)];
provinceMapTap.delegate = self;
[_mapView addGestureRecognizer:provinceMapTap];

最后实现手势代理方法判断出需要触发哪一个手势

#pragma mark 手势代理方法 ，判断触摸的是地图还是外层的view
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
    //判断如果是百度地图的view 既可以实现手势拖动 scrollview 的滚动关闭
    if ([gestureRecognizer.view isKindOfClass:[BMKMapView class]] ){
        scroAll.scrollEnabled = NO;
        scroRoute.scrollEnabled = NO;
        return YES;
    }else{
        scroAll.scrollEnabled = YES;
        scroRoute.scrollEnabled = YES;
        return NO;
    }
}

需要注意的一点是给地图添加了点击手势需要实现方法，不然会崩溃

-(void)provinceMapTapped{
}

演示效果

示例.gif

顺便整理一下如何判断scrollView的滑动方向

声明变量

@interface ViewController ()<UIScrollViewDelegate>
{
    UIScrollView *scro;
    float lastContentOffsetX;
    float lastContentOffsetY;
}

在scrollViewWillBeginDragging方法里记录开始前的X、Y值

-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    lastContentOffsetY = scrollView.contentOffset.y;
    lastContentOffsetX = scrollView.contentOffset.x;
}

在scrollViewDidScroll方法里判断滑动方向

-(void)scrollViewDidScroll:(UIScrollView *)scrollView {
    if(scrollView.contentOffset.y>lastContentOffsetY){
        NSLog(@"向上滑动");
    }else if(scrollView.contentOffset.y<lastContentOffsetY){
        NSLog(@"向下滑动");
    }
    if(scrollView.contentOffset.x<lastContentOffsetX){
        NSLog(@"向左滑动");
    }else if(scrollView.contentOffset.x>lastContentOffsetX){
        NSLog(@"向右滑动");
    }
}