佛山外贸网站,招聘平台哪个好用,商丘网站建设大全,dede手机网站模板修改https://www.jianshu.com/p/93e8459b6dae 2017.06.01 01:13* 字数 674 阅读 1201评论 0喜欢 12017.06.01 01:13* 字数 674 阅读 1201评论 0喜欢 1 版本记录 版本号 时间 V1.0 2017.05.31 前言 ios中又很多实用的小技巧#xff0c;实现不难很实用#xff0c;以后我会慢慢的… https://www.jianshu.com/p/93e8459b6dae 2017.06.01 01:13* 字数 674 阅读 1201评论 0喜欢 1 2017.06.01 01:13* 字数 674 阅读 1201评论 0喜欢 1 版本记录 版本号 时间 V1.0 2017.05.31 前言 ios中又很多实用的小技巧实现不难很实用以后我会慢慢的给大家总结。这一篇主要讲述滚动方向的判断。 滚动视图是app很常用的视图形式而其中scrollView及其子类UITableView和UICollectionView用的很多在用的时候有一个需求就是需要判断当前的滚动方向 向上滚动向下滚动向左滚动向右滚动下面就以两个例子对滚动方向进行判断下面我们开始。详情 一、左右滚动方向的判断 下面我们就以UIScrollView为例子说明左右滚动是如何判断的还是先看一下代码组成。 代码组成 思路引导 下面我们看当我们向左滚动时可见x为正值且越来越大如下 2017-06-01 00:15:47.962 scrollDirectionJudge[2981:77203] x0.333333,y-64.000000 2017-06-01 00:15:48.026 scrollDirectionJudge[2981:77203] x1.000000,y-64.000000 2017-06-01 00:15:48.057 scrollDirectionJudge[2981:77203] x1.333333,y-64.000000 2017-06-01 00:15:48.089 scrollDirectionJudge[2981:77203] x1.666667,y-64.000000 2017-06-01 00:15:48.122 scrollDirectionJudge[2981:77203] x2.000000,y-64.000000 2017-06-01 00:15:48.145 scrollDirectionJudge[2981:77203] x4.000000,y-64.000000 2017-06-01 00:15:48.170 scrollDirectionJudge[2981:77203] x7.666667,y-64.000000 2017-06-01 00:15:48.194 scrollDirectionJudge[2981:77203] x11.000000,y-64.000000 2017-06-01 00:15:48.218 scrollDirectionJudge[2981:77203] x12.666667,y-64.000000 2017-06-01 00:15:48.235 scrollDirectionJudge[2981:77203] x13.000000,y-64.000000 2017-06-01 00:15:48.956 scrollDirectionJudge[2981:77203] x13.666667,y-64.000000 2017-06-01 00:15:49.036 scrollDirectionJudge[2981:77203] x14.000000,y-64.000000 反过来如果我们向右滑动可见 2017-06-01 00:17:27.177 scrollDirectionJudge[2981:77203] x412.000000,y-64.000000 2017-06-01 00:17:27.200 scrollDirectionJudge[2981:77203] x407.666667,y-64.000000 2017-06-01 00:17:27.216 scrollDirectionJudge[2981:77203] x405.333333,y-64.000000 2017-06-01 00:17:27.240 scrollDirectionJudge[2981:77203] x402.333333,y-64.000000 2017-06-01 00:17:27.265 scrollDirectionJudge[2981:77203] x401.333333,y-64.000000 2017-06-01 00:17:27.288 scrollDirectionJudge[2981:77203] x401.000000,y-64.000000 2017-06-01 00:17:27.353 scrollDirectionJudge[2981:77203] x400.666667,y-64.000000 2017-06-01 00:17:27.377 scrollDirectionJudge[2981:77203] x399.666667,y-64.000000 2017-06-01 00:17:27.400 scrollDirectionJudge[2981:77203] x397.666667,y-64.000000 2017-06-01 00:17:27.416 scrollDirectionJudge[2981:77203] x395.666667,y-64.000000 2017-06-01 00:17:27.432 scrollDirectionJudge[2981:77203] x393.333333,y-64.000000 2017-06-01 00:17:27.448 scrollDirectionJudge[2981:77203] x391.666667,y-64.000000 2017-06-01 00:17:27.473 scrollDirectionJudge[2981:77203] x390.333333,y-64.000000 那么我们可见可以有这个思路如果我们记录当前的x偏移值并且用下一时刻临近的x偏移值与之相比较取差值如果下一时刻的x偏移值 - 当前x偏移值为正值则是向左边滑动反之则为向右滑动。 看输出结果先看向左滑动 2017-06-01 00:24:38.629 scrollDirectionJudge[3185:84739] x4.666667,y-64.000000 2017-06-01 00:24:38.629 scrollDirectionJudge[3185:84739] 正在向左滑动 2017-06-01 00:24:38.652 scrollDirectionJudge[3185:84739] x10.666667,y-64.000000 2017-06-01 00:24:38.652 scrollDirectionJudge[3185:84739] 正在向左滑动 2017-06-01 00:24:38.676 scrollDirectionJudge[3185:84739] x15.666667,y-64.000000 2017-06-01 00:24:38.677 scrollDirectionJudge[3185:84739] 正在向左滑动 2017-06-01 00:24:38.700 scrollDirectionJudge[3185:84739] x20.000000,y-64.000000 2017-06-01 00:24:38.700 scrollDirectionJudge[3185:84739] 正在向左滑动 2017-06-01 00:24:38.726 scrollDirectionJudge[3185:84739] x22.666667,y-64.000000 2017-06-01 00:24:38.727 scrollDirectionJudge[3185:84739] 正在向左滑动 2017-06-01 00:24:38.747 scrollDirectionJudge[3185:84739] x24.333333,y-64.000000 2017-06-01 00:24:38.748 scrollDirectionJudge[3185:84739] 正在向左滑动 2017-06-01 00:24:38.764 scrollDirectionJudge[3185:84739] x25.000000,y-64.000000 2017-06-01 00:24:38.765 scrollDirectionJudge[3185:84739] 正在向左滑动 2017-06-01 00:24:38.792 scrollDirectionJudge[3185:84739] x25.666667,y-64.000000 2017-06-01 00:24:38.792 scrollDirectionJudge[3185:84739] 正在向左滑动 在看向右滑动 2017-06-01 00:25:58.949 scrollDirectionJudge[3185:84739] x27.333333,y-64.000000 2017-06-01 00:25:58.950 scrollDirectionJudge[3185:84739] 正在向右滑动 2017-06-01 00:25:58.970 scrollDirectionJudge[3185:84739] x24.333333,y-64.000000 2017-06-01 00:25:58.970 scrollDirectionJudge[3185:84739] 正在向右滑动 2017-06-01 00:25:58.986 scrollDirectionJudge[3185:84739] x22.666667,y-64.000000 2017-06-01 00:25:58.986 scrollDirectionJudge[3185:84739] 正在向右滑动 2017-06-01 00:25:59.002 scrollDirectionJudge[3185:84739] x21.333333,y-64.000000 2017-06-01 00:25:59.003 scrollDirectionJudge[3185:84739] 正在向右滑动 2017-06-01 00:25:59.018 scrollDirectionJudge[3185:84739] x20.000000,y-64.000000 2017-06-01 00:25:59.019 scrollDirectionJudge[3185:84739] 正在向右滑动 2017-06-01 00:25:59.034 scrollDirectionJudge[3185:84739] x19.333333,y-64.000000 2017-06-01 00:25:59.035 scrollDirectionJudge[3185:84739] 正在向右滑动 2017-06-01 00:25:59.054 scrollDirectionJudge[3185:84739] x18.666667,y-64.000000 2017-06-01 00:25:59.054 scrollDirectionJudge[3185:84739] 正在向右滑动 2017-06-01 00:25:59.074 scrollDirectionJudge[3185:84739] x16.000000,y-64.000000 2017-06-01 00:25:59.074 scrollDirectionJudge[3185:84739] 正在向右滑动 2017-06-01 00:25:59.090 scrollDirectionJudge[3185:84739] x14.000000,y-64.000000 2017-06-01 00:25:59.091 scrollDirectionJudge[3185:84739] 正在向右滑动 2017-06-01 00:25:59.115 scrollDirectionJudge[3185:84739] x11.666667,y-64.000000 2017-06-01 00:25:59.115 scrollDirectionJudge[3185:84739] 正在向右滑动 2017-06-01 00:25:59.138 scrollDirectionJudge[3185:84739] x10.666667,y-64.000000 2017-06-01 00:25:59.139 scrollDirectionJudge[3185:84739] 正在向右滑动 2017-06-01 00:25:59.195 scrollDirectionJudge[3185:84739] x10.000000,y-64.000000 2017-06-01 00:25:59.196 scrollDirectionJudge[3185:84739] 正在向右滑动 2017-06-01 00:25:59.251 scrollDirectionJudge[3185:84739] x9.666667,y-64.000000 2017-06-01 00:25:59.251 scrollDirectionJudge[3185:84739] 正在向右滑动 代码实现 下面我们就直接看代码的实现。 JJHorizontalDirectionVC.m #import JJHorizontalDirectionVC.h interface JJHorizontalDirectionVC () UIScrollViewDelegate property (nonatomic, strong) UIScrollView *textScrollView; property (nonatomic, assign) CGFloat lastOffSetX; end implementation JJHorizontalDirectionVC #pragma mark - Override Base Function - (void)viewDidLoad { [super viewDidLoad]; [self setupUI]; } #pragma mark - Object Private Function - (void)setupUI { UIScrollView *textScrollView [[UIScrollView alloc] initWithFrame:self.view.frame]; textScrollView.backgroundColor [UIColor greenColor]; textScrollView.contentSize CGSizeMake(self.view.bounds.size.width * 2, 0); textScrollView.delegate self; [self.view addSubview:textScrollView]; self.textScrollView textScrollView; } #pragma mark - UIScrollViewDelegate - (void)scrollViewDidScroll:(UIScrollView *)scrollView { NSLog(x%f,y%f,scrollView.contentOffset.x,scrollView.contentOffset.y); if (scrollView.contentOffset.x - self.lastOffSetX 0) { NSLog(正在向左滑动); } else { NSLog(正在向右滑动); } } - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView { self.lastOffSetX scrollView.contentOffset.x; } end 二、上下滚动方向的判断 下面我们就以UIScrollView为例子说明上下滚动是如何判断的还是先看一下代码组成。 代码组织 思路引导 前面有了左右方向的判断相信大家掌握了那么上下方向的判断也是这个思路。 先看向上滚动的输出 2017-06-01 00:48:03.131 scrollDirectionJudge[3579:100464] x0.000000,y0.666667 2017-06-01 00:48:03.148 scrollDirectionJudge[3579:100464] x0.000000,y2.000000 2017-06-01 00:48:03.171 scrollDirectionJudge[3579:100464] x0.000000,y3.666667 2017-06-01 00:48:03.187 scrollDirectionJudge[3579:100464] x0.000000,y5.000000 2017-06-01 00:48:03.203 scrollDirectionJudge[3579:100464] x0.000000,y6.000000 2017-06-01 00:48:03.229 scrollDirectionJudge[3579:100464] x0.000000,y6.666667 2017-06-01 00:48:03.246 scrollDirectionJudge[3579:100464] x0.000000,y7.000000 2017-06-01 00:48:03.733 scrollDirectionJudge[3579:100464] x0.000000,y7.333333 2017-06-01 00:48:03.757 scrollDirectionJudge[3579:100464] x0.000000,y8.000000 2017-06-01 00:48:03.773 scrollDirectionJudge[3579:100464] x0.000000,y8.333333 2017-06-01 00:48:03.797 scrollDirectionJudge[3579:100464] x0.000000,y9.333333 2017-06-01 00:48:03.832 scrollDirectionJudge[3579:100464] x0.000000,y10.333333 2017-06-01 00:48:03.863 scrollDirectionJudge[3579:100464] x0.000000,y11.000000 2017-06-01 00:48:03.981 scrollDirectionJudge[3579:100464] x0.000000,y11.333333 2017-06-01 00:48:04.005 scrollDirectionJudge[3579:100464] x0.000000,y12.666667 2017-06-01 00:48:04.029 scrollDirectionJudge[3579:100464] x0.000000,y14.333333 2017-06-01 00:48:04.047 scrollDirectionJudge[3579:100464] x0.000000,y15.000000 2017-06-01 00:48:04.064 scrollDirectionJudge[3579:100464] x0.000000,y15.333333 2017-06-01 00:48:04.214 scrollDirectionJudge[3579:100464] x0.000000,y16.000000 2017-06-01 00:48:04.237 scrollDirectionJudge[3579:100464] x0.000000,y17.000000 2017-06-01 00:48:04.262 scrollDirectionJudge[3579:100464] x0.000000,y19.333333 2017-06-01 00:48:04.286 scrollDirectionJudge[3579:100464] x0.000000,y21.666667 2017-06-01 00:48:04.311 scrollDirectionJudge[3579:100464] x0.000000,y22.666667 2017-06-01 00:48:04.494 scrollDirectionJudge[3579:100464] x0.000000,y23.666667 2017-06-01 00:48:04.518 scrollDirectionJudge[3579:100464] x0.000000,y24.666667 我们在看一下向下滚动 2017-06-01 00:49:12.548 scrollDirectionJudge[3579:100464] x0.000000,y735.333333 2017-06-01 00:49:12.571 scrollDirectionJudge[3579:100464] x0.000000,y733.333333 2017-06-01 00:49:12.587 scrollDirectionJudge[3579:100464] x0.000000,y732.666667 2017-06-01 00:49:12.614 scrollDirectionJudge[3579:100464] x0.000000,y732.000000 2017-06-01 00:49:12.660 scrollDirectionJudge[3579:100464] x0.000000,y731.666667 2017-06-01 00:49:12.796 scrollDirectionJudge[3579:100464] x0.000000,y731.333333 2017-06-01 00:49:12.813 scrollDirectionJudge[3579:100464] x0.000000,y730.666667 2017-06-01 00:49:12.831 scrollDirectionJudge[3579:100464] x0.000000,y730.000000 2017-06-01 00:49:13.101 scrollDirectionJudge[3579:100464] x0.000000,y729.666667 2017-06-01 00:49:13.125 scrollDirectionJudge[3579:100464] x0.000000,y729.000000 2017-06-01 00:49:13.149 scrollDirectionJudge[3579:100464] x0.000000,y725.666667 2017-06-01 00:49:13.167 scrollDirectionJudge[3579:100464] x0.000000,y721.333333 2017-06-01 00:49:13.183 scrollDirectionJudge[3579:100464] x0.000000,y717.000000 2017-06-01 00:49:13.204 scrollDirectionJudge[3579:100464] x0.000000,y711.000000 2017-06-01 00:49:13.221 scrollDirectionJudge[3579:100464] x0.000000,y709.000000 2017-06-01 00:49:13.237 scrollDirectionJudge[3579:100464] x0.000000,y707.333333 2017-06-01 00:49:13.265 scrollDirectionJudge[3579:100464] x0.000000,y706.333333 那么我们可见可以有这个思路如果我们记录当前的y偏移值并且用下一时刻临近的y偏移值与之相比较取差值如果下一时刻的y偏移值 - 当前y偏移值为正值则是向上边滑动反之则为向下边滑动。 下面看最后的输出结果先看向上滑动。 2017-06-01 00:55:03.163 scrollDirectionJudge[3709:105104] x0.000000,y139.666667 2017-06-01 00:55:03.163 scrollDirectionJudge[3709:105104] 正在向上滑动 2017-06-01 00:55:03.184 scrollDirectionJudge[3709:105104] x0.000000,y143.000000 2017-06-01 00:55:03.184 scrollDirectionJudge[3709:105104] 正在向上滑动 2017-06-01 00:55:03.213 scrollDirectionJudge[3709:105104] x0.000000,y146.666667 2017-06-01 00:55:03.213 scrollDirectionJudge[3709:105104] 正在向上滑动 2017-06-01 00:55:03.232 scrollDirectionJudge[3709:105104] x0.000000,y149.666667 2017-06-01 00:55:03.232 scrollDirectionJudge[3709:105104] 正在向上滑动 2017-06-01 00:55:03.248 scrollDirectionJudge[3709:105104] x0.000000,y151.666667 2017-06-01 00:55:03.248 scrollDirectionJudge[3709:105104] 正在向上滑动 2017-06-01 00:55:03.264 scrollDirectionJudge[3709:105104] x0.000000,y153.666667 2017-06-01 00:55:03.265 scrollDirectionJudge[3709:105104] 正在向上滑动 2017-06-01 00:55:03.297 scrollDirectionJudge[3709:105104] x0.000000,y155.333333 2017-06-01 00:55:03.297 scrollDirectionJudge[3709:105104] 正在向上滑动 2017-06-01 00:55:03.332 scrollDirectionJudge[3709:105104] x0.000000,y156.666667 2017-06-01 00:55:03.332 scrollDirectionJudge[3709:105104] 正在向上滑动 2017-06-01 00:55:03.401 scrollDirectionJudge[3709:105104] x0.000000,y157.000000 2017-06-01 00:55:03.401 scrollDirectionJudge[3709:105104] 正在向上滑动 2017-06-01 00:55:03.457 scrollDirectionJudge[3709:105104] x0.000000,y157.333333 2017-06-01 00:55:03.457 scrollDirectionJudge[3709:105104] 正在向上滑动 2017-06-01 00:55:03.481 scrollDirectionJudge[3709:105104] x0.000000,y158.000000 2017-06-01 00:55:03.481 scrollDirectionJudge[3709:105104] 正在向上滑动 2017-06-01 00:55:03.504 scrollDirectionJudge[3709:105104] x0.000000,y158.333333 2017-06-01 00:55:03.505 scrollDirectionJudge[3709:105104] 正在向上滑动 2017-06-01 00:55:03.561 scrollDirectionJudge[3709:105104] x0.000000,y159.000000 2017-06-01 00:55:03.561 scrollDirectionJudge[3709:105104] 正在向上滑动 在看一下向下滑动 2017-06-01 00:55:30.613 scrollDirectionJudge[3709:105104] x0.000000,y734.000000 2017-06-01 00:55:30.614 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.636 scrollDirectionJudge[3709:105104] x0.000000,y730.666667 2017-06-01 00:55:30.637 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.653 scrollDirectionJudge[3709:105104] x0.000000,y728.666667 2017-06-01 00:55:30.653 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.680 scrollDirectionJudge[3709:105104] x0.000000,y723.666667 2017-06-01 00:55:30.680 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.701 scrollDirectionJudge[3709:105104] x0.000000,y717.666667 2017-06-01 00:55:30.702 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.731 scrollDirectionJudge[3709:105104] x0.000000,y711.000000 2017-06-01 00:55:30.732 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.749 scrollDirectionJudge[3709:105104] x0.000000,y705.333333 2017-06-01 00:55:30.749 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.766 scrollDirectionJudge[3709:105104] x0.000000,y701.666667 2017-06-01 00:55:30.767 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.790 scrollDirectionJudge[3709:105104] x0.000000,y698.666667 2017-06-01 00:55:30.790 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.813 scrollDirectionJudge[3709:105104] x0.000000,y697.000000 2017-06-01 00:55:30.813 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.830 scrollDirectionJudge[3709:105104] x0.000000,y696.333333 2017-06-01 00:55:30.830 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.926 scrollDirectionJudge[3709:105104] x0.000000,y695.666667 2017-06-01 00:55:30.927 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.950 scrollDirectionJudge[3709:105104] x0.000000,y694.666667 2017-06-01 00:55:30.951 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.973 scrollDirectionJudge[3709:105104] x0.000000,y692.333333 2017-06-01 00:55:30.974 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:30.997 scrollDirectionJudge[3709:105104] x0.000000,y690.000000 2017-06-01 00:55:30.998 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:31.014 scrollDirectionJudge[3709:105104] x0.000000,y688.666667 2017-06-01 00:55:31.015 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:31.030 scrollDirectionJudge[3709:105104] x0.000000,y687.000000 2017-06-01 00:55:31.031 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:31.053 scrollDirectionJudge[3709:105104] x0.000000,y684.666667 2017-06-01 00:55:31.054 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:31.069 scrollDirectionJudge[3709:105104] x0.000000,y683.666667 2017-06-01 00:55:31.070 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:31.097 scrollDirectionJudge[3709:105104] x0.000000,y682.666667 2017-06-01 00:55:31.097 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:31.190 scrollDirectionJudge[3709:105104] x0.000000,y681.666667 2017-06-01 00:55:31.191 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:31.287 scrollDirectionJudge[3709:105104] x0.000000,y681.333333 2017-06-01 00:55:31.287 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:31.318 scrollDirectionJudge[3709:105104] x0.000000,y681.000000 2017-06-01 00:55:31.319 scrollDirectionJudge[3709:105104] 正在向下滑动 2017-06-01 00:55:31.361 scrollDirectionJudge[3709:105104] x0.000000,y680.333333 2017-06-01 00:55:31.361 scrollDirectionJudge[3709:105104] 正在向下滑动 代码实现 看代码实现 JJVerticalDirectionVC.m #import JJVerticalDirectionVC.h interface JJVerticalDirectionVC () UIScrollViewDelegate property (nonatomic, strong) UIScrollView *textScrollView; property (nonatomic, assign) CGFloat lastOffSetY; end implementation JJVerticalDirectionVC #pragma mark - Override Base Function - (void)viewDidLoad { [super viewDidLoad]; [self setupUI]; } #pragma mark - Object Private Function - (void)setupUI { UIScrollView *textScrollView [[UIScrollView alloc] initWithFrame:self.view.frame]; textScrollView.backgroundColor [UIColor magentaColor]; textScrollView.contentSize CGSizeMake(0, self.view.bounds.size.height * 2); textScrollView.delegate self; [self.view addSubview:textScrollView]; self.textScrollView textScrollView; } #pragma mark - UIScrollViewDelegate - (void)scrollViewDidScroll:(UIScrollView *)scrollView { NSLog(x%f,y%f,scrollView.contentOffset.x,scrollView.contentOffset.y); if (scrollView.contentOffset.y - self.lastOffSetY 0) { NSLog(正在向上滑动); } else { NSLog(正在向下滑动); } } - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView { self.lastOffSetY scrollView.contentOffset.y; } end 后记 判断视图的滚动方向是我们经常有的需求这篇就先介绍到这后面还会介绍其他的实用小技巧希望对大家有所帮助谢谢大家。 UIScrollView如何判断是向右滚动还是向左滚动 https://blog.csdn.net/www9500net_/article/details/52622815 在做类似网易新闻和今日头条的那个效果时候 当我滚动下标为0的时候,也就是第一个标题的时候,往右继续滑动,会重复请求第一个标题的数据 同理当我滚动到最后一个标题的时候,会重复请求最后一个标题的数据 特此记录下解决方法: 1:首先设置pageEnableYES 然后通过Delegate实现相关方法。 2: #pragma mark - 将要开始拖拽手指已经放在view上并准备拖动的那一刻 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{ //拖动前的起始坐标 startContentOffsetX scrollView.contentOffset.x; } 3: #pragma mark - 将要停止前的坐标 - (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{ willEndContentOffsetX scrollView.contentOffset.x; } 4: #pragma mark - 减速停止(必须得有快速拖动的动作scrollView滚动完毕(速度减为0)并且手已经松开的时候调用) - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{ endContentOffsetX scrollView.contentOffset.x; if (endContentOffsetX willEndContentOffsetX willEndContentOffsetX startContentOffsetX) { //画面从右往左移动前一页 } else if (endContentOffsetX willEndContentOffsetX willEndContentOffsetX startContentOffsetX) {//画面从左往右移动后一页 } } --------------------- 作者正能量_ 来源CSDN 原文https://blog.csdn.net/www9500net_/article/details/52622815 版权声明本文为博主原创文章转载请附上博文链接 转载于:https://www.cnblogs.com/sundaysgarden/p/10556452.html
