UIScrollView輪播圖，當手指放上去的時候停止播放，手指離開時開始播放。
我的實現(xiàn)思路是在scrollView上加一個長按手勢UILongPressGestureRecognizer。

//添加長按手勢
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longUiscrollView:)];
        longPress.delegate = self;
        [_scrollV addGestureRecognizer:longPress];

//手勢方法實現(xiàn)
- (void)longUiscrollView:(UITapGestureRecognizer *)tap{
    [self.timer invalidate];//循環(huán)終止
    self.timer = nil;
    //(手勢完成時)手指離開時
    if (tap.state == UIGestureRecognizerStateEnded) {
        self.timer = [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(nextPage) userInfo:nil repeats:YES];
    }
}

輪播圖整個需求實現(xiàn)

#pragma mark - UIScrollViewDelegate

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    NSInteger index = (self.scrollV.contentOffset.x ) / MAINSCREEN_WIDTH;
//這兒數(shù)值根據(jù)自己的需求設定
    if (index < 1) {
        self.scrollV.contentOffset = CGPointMake(2 * MAINSCREEN_WIDTH, 0);
    }else if(index > 2){
        self.scrollV.contentOffset = CGPointMake( MAINSCREEN_WIDTH, 0);
    }
}
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{
    [self scrollViewDidEndDecelerating:self.scrollV];
}
//開始手動滑動時停止自動播放
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
    [self.timer invalidate];//循環(huán)終止
    self.timer = nil;
}
//結(jié)束手動滑動是開始自動播放
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
    self.timer = [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(nextPage) userInfo:nil repeats:YES];
}
- (void)nextPage{
    [self.scrollV setContentOffset:CGPointMake(self.scrollV.contentOffset.x + MAINSCREEN_WIDTH,0 )animated:YES];
}
- (void)longUiscrollView:(UITapGestureRecognizer *)tap{
    [self.timer invalidate];//循環(huán)終止
    self.timer = nil;
    //(手勢完成時)手指離開時
    if (tap.state == UIGestureRecognizerStateEnded) {
        self.timer = [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(nextPage) userInfo:nil repeats:YES];
    }
}