一个最优解，完美解决了手势滑动的开始结束和代码滑动的问题

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{

    [NSObject cancelPreviousPerformRequestsWithTarget:self];

    //NSLog(@"滑动停止（animation）");

    _isScrolling = NO ;

    NSLog(@"滑动停止 = page%@",@(self.currentPage) );

}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{

    [NSObject cancelPreviousPerformRequestsWithTarget:self];

    [self performSelector:@selector(scrollViewDidEndScrollingAnimation:) withObject:nilafterDelay:0.3];

    //NSLog(@"滑动中");

    _isScrolling = YES ;

}