UISrcollView自动滚动

Question

//
//

//
//手动左右无缝已经写完,差自动滚动,<方向:向右>带切换动画.
//

//

//

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic ,strong)UIScrollView *scrollView;
@property (nonatomic ,strong)UIPageControl *pageControl;
@property (nonatomic ,strong)NSTimer *timer;
@property (nonatomic ,assign)CGFloat width;
@property (nonatomic ,assign)CGFloat height;

@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];
  _width = [[UIScreen mainScreen] bounds].size.width;
  _height = [[UIScreen mainScreen] bounds].size.height;
  _scrollView = [[UIScrollView alloc] init];
  _scrollView.frame = self.view.bounds;
  _scrollView.backgroundColor = [UIColor brownColor];
  _scrollView.pagingEnabled = YES;
  _scrollView.delegate = self;
  _scrollView.contentSize = CGSizeMake(_width*7, _height);
  _scrollView.contentOffset = CGPointMake(_width, 0);

  for (int i = 0; i<7; i++)
  {
  UIImageView imgV = [UIImageView new];
  imgV.frame = CGRectMake(i_width, 0, width, _height);
  imgV.contentMode = UIViewContentModeScaleAspectFit;
  NSString *str = [NSString stringWithFormat:@"IMG%i",i+1];
  imgV.image = [UIImage imageNamed:str];
  [_scrollView addSubview:imgV];
  }

  [self.view addSubview:_scrollView];

  _pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(20, _height*0.8, _width-40, 50)];
  _pageControl.pageIndicatorTintColor = [UIColor whiteColor];
  _pageControl.currentPageIndicatorTintColor = [UIColor blueColor];
  _pageControl.numberOfPages = 5;
  _pageControl.currentPage = 0;
  [self.view addSubview:_pageControl];

// _timer = [NSTimer scheduledTimerWithTimeInterval:1.5 target:self selector:@selector(dddselecteddd) userInfo:nil repeats:YES];

}

//- (void)dddselecteddd
//{
//

// CGFloat aa = _scrollView.contentOffset.x;
// aa += _width;
// [UIView animateWithDuration:0.5 animations:^{
// _scrollView.contentOffset= CGPointMake(aa, 0);
// }];
//

//

// if (_scrollView.contentOffset.x > 5*_width)
// {
// _scrollView.contentOffset = CGPointMake(0, 0);
// }
//

//

//}

#pragma - mark 滑动;

• (void)scrollViewDidScroll:(UIScrollView *)scrollView
  {
  NSInteger page = _scrollView.contentOffset.x/_width;
  _pageControl.currentPage = page-1;

  if (_scrollView.contentOffset.x == 6*_width)
  {
  _scrollView.contentOffset = CGPointMake(_width, 0);
  }
  else if (_scrollView.contentOffset.x == 0*_width)
  {
  _scrollView.contentOffset = CGPointMake(5*_width, 0);
  }
  }

• (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
  }

@end

Answer 1

原理就是一个长条形的div放置几张图片，然后复制这个div放到右边（上下左都可以，看你滚动方向），隐藏滚动条，然后设置滚动条的偏移，滚动条滚动到最右侧的时候偏移赋值为0，从头开始（我是做js的，你写的真心看不懂，仅供参考）