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ScrollView 实现循环轮播

时间:2016-06-02 20:05:46      阅读:218      评论:0      收藏:0      [点我收藏+]

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  1 #import "MassageViewController.h"
  2 @interface MassageViewController()<UIScrollViewDelegate>
  3 @property (nonatomic,strong) UIScrollView *PicScrollView;
  4 @property (nonatomic,strong) UIPageControl *PicCtr;
  5 @property (nonatomic,strong) NSTimer *timer;
  6 @property (nonatomic,strong) NSMutableArray *picArr;
  7 @property (nonatomic,strong) UIImageView *PicImageView;
  8 @property (nonatomic,strong) UIImageView *lastImageView;
  9 @end
 10 
 11 @implementation MassageViewController
 12 -(NSMutableArray *)picArr{
 13     if (self.picArr==nil) {
 14         _picArr = [NSMutableArray array];
 15     }
 16     return _picArr;
 17 }
 18 
 19 -(void)viewDidLoad{
 20     self.picArr = [self loadImageData];
 21     self.PicScrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 150, self.view.frame.size.width, 200)];
 22     _PicScrollView.pagingEnabled = YES;
 23     _PicScrollView.delegate = self;
 24     _PicScrollView.showsHorizontalScrollIndicator = NO;
 25     _PicScrollView.tag = 1000;
 26     _PicScrollView.contentSize = CGSizeMake(self.PicScrollView.width * (_picArr.count), 0);
 27     for (int i =0; i<_picArr.count; i++) {
 28         CGFloat imgX = self.view.frame.size.width * i;
 29         self.PicImageView = [[UIImageView alloc]initWithFrame:CGRectMake(imgX, 0, self.view.frame.size.width, 200)];
 30         _PicImageView.image = [_picArr objectAtIndex:i];
 31         [_PicScrollView addSubview:_PicImageView];
 32     }
 33     CGFloat imgX = CGRectGetWidth(self.view.frame)*_picArr.count;
 34     _lastImageView = [[UIImageView alloc]initWithFrame:CGRectMake(imgX, 0, self.view.frame.size.width, 200)];
 35     _lastImageView.image = [_picArr objectAtIndex:0];
 36     [_PicScrollView addSubview:_lastImageView];
 37     
 38     
 39     [self.view addSubview:_PicScrollView];
 40     self.PicCtr = [[UIPageControl alloc]initWithFrame:CGRectMake((self.PicScrollView.width-150)/2, self.PicScrollView.y+200-40, 150, 30)];
 41     _PicCtr.pageIndicatorTintColor = [UIColor grayColor];
 42     _PicCtr.currentPageIndicatorTintColor = [UIColor redColor];
 43     _PicCtr.numberOfPages = 5;
 44     _PicCtr.currentPage = 0;
 45     [self.view addSubview:_PicCtr];
 46     [self.view bringSubviewToFront:_PicCtr];
 47     
 48     self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(scrollImage) userInfo:nil repeats:YES];
 49     //修改优先级与其他控件一样
 50     //获取当前消息循环对象
 51     NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
 52     //设置优先级
 53     [runLoop addTimer:self.timer forMode:NSRunLoopCommonModes];
 54 }
 55 
 56 -(NSMutableArray *)loadImageData{//加载图片
 57     NSMutableArray *arr = [NSMutableArray array];
 58     for (int i = 0; i<5; i++) {
        //为了节约内存,建议使用路径加载,注意图片不要放在Assets.xcassets里面,否则读取不到
59 NSString *imgName = [NSString stringWithFormat:@"%02d.jpg",i+1];//注意.jpg格式,图片格式统一 60 NSString *imgPath = [[NSBundle mainBundle]pathForResource:imgName ofType:nil]; 61 UIImage *image = [UIImage imageWithContentsOfFile:imgPath]; 62 [arr addObject:image]; 63 } 64 return arr; 65 } 66 67 -(UIStatusBarStyle)preferredStatusBarStyle{ 68 return UIStatusBarStyleLightContent; 69 } 70 71 -(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{ 72 //停止计时器 73 [self.timer invalidate]; 74 self.timer = nil; 75 } 76 77 -(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{ 78 79 //r如果放到didscroll里面,每次自动播放都会调用,我们想要手指拖动时才调用,所以放到这里面,每次拖到第几张,白点就点亮 80 CGFloat offsetX = self.PicScrollView.contentOffset.x + self.PicScrollView.frame.size.width/2; 81 int index = offsetX/self.PicScrollView.width; 82 _PicCtr.currentPage = index; 83 84 //重新启用计时器 85 self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(scrollImage) userInfo:nil repeats:YES]; 86 //修改优先级与其他控件一样 87 //获取当前消息循环对象 88 NSRunLoop *runLoop = [NSRunLoop currentRunLoop]; 89 //设置优先级 90 [runLoop addTimer:self.timer forMode:NSRunLoopCommonModes]; 91 } 92 93 -(void)scrollImage{ 94 //在scrollview后面加一个imageview,和第一个图一样。 95 float offsetx = _PicScrollView.contentOffset.x; 96 offsetx += CGRectGetWidth(self.view.frame); 97 if (offsetx == CGRectGetWidth(self.view.frame)*_picArr.count) { 98 _PicCtr.currentPage = 0; 99 }else{ 100 _PicCtr.currentPage = offsetx/CGRectGetWidth(self.view.frame); 101 } 102 if (offsetx>CGRectGetWidth(self.view.frame)*_picArr.count) { 103 //直接复制速度很快直接和lastImageView一样,看起来就是循环播放的 104 _PicScrollView.contentOffset= CGPointMake(0, 0); 105 _PicCtr.currentPage = 1; 106 [_PicScrollView setContentOffset:CGPointMake(CGRectGetWidth(self.view.frame), 0) animated:YES]; 107 }else{ 108 [_PicScrollView setContentOffset:CGPointMake(offsetx, 0) animated:YES]; 109 } 110 } 111 @end

 

ScrollView 实现循环轮播

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原文地址:http://www.cnblogs.com/yangqinglong/p/5554108.html

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