轮播图 无限轮播

 1 #import "YHView.h"
 2 #define kCount self.imgArr.count
 3 #define kWidth self.frame.size.width
 4 #define kHeight self.frame.size.height
 5 
 6 @implementation YHView
 7 
 8 - (instancetype)initWithFrame:(CGRect)frame
 9                     andImgArr:(NSMutableArray *)imgArr {
10     if (self = [super initWithFrame:frame]) {
11         self.imgArr = imgArr;
12         
13         // 添加子视图
14         [self add];
15     }
16     return self;
17 }
18 
19 
20 
21 - (void)add {
22     
23     // 创建scroll对象
24     self.scroll = [[UIScrollView alloc] initWithFrame:self.frame];
25     self.scroll.contentSize = CGSizeMake(kWidth *(kCount + 2), 0);
26     self.scroll.pagingEnabled = YES;
27     self.scroll.showsHorizontalScrollIndicator = NO;
28     
29     [self addSubview:self.scroll];
30     
31     // 将最后一张图片添加到第一的位置
32     [self addImageView:(int)(kCount - 1)];
33     self.imgView.frame = CGRectMake(0, 0, kWidth, kHeight);
34     
35     // for循环添加imgView
36     for (int i = 0; i < kCount; i++) {
37         [self addImageView:i];
38         self.imgView.frame = CGRectMake(kWidth * (i + 1), 0, kWidth, kHeight);
39     }
40     
41     // 将第一张放到最后的位置
42     [self addImageView:0];
43     self.imgView.frame = CGRectMake(kWidth * (kCount + 1), 0, kWidth, kHeight);
44     
45     // 设置初始偏移量
46     self.scroll.contentOffset = CGPointMake(kWidth, 0);
47     
48     
49     
50     // 创建page对象
51     self.page = [[UIPageControl alloc] initWithFrame:CGRectMake(0, kHeight - 20, kWidth, 20)];
52     
53     self.page.numberOfPages = kCount;
54     
55     [self addSubview:self.page];
56 }
57 
58 
59 // 创建imgView添加到scroll上
60 - (void)addImageView:(int)index {
61     self.imgView = [[UIImageView alloc] initWithImage:self.imgArr[index]];
62     [self.scroll addSubview:self.imgView];
63 }
64 
65 
66 @end

 1 #import "RootView.h"
 2 
 3 @implementation RootView
 4 
 5 - (instancetype)initWithFrame:(CGRect)frame
 6 {
 7     self = [super initWithFrame:frame];
 8     if (self) {
 9         [self add];
10     }
11     return self;
12 }
13 
14 
15 - (void)add {
16     
17     // 创建存放图片的数组
18     NSMutableArray *imgArr = [[NSMutableArray alloc] init];
19     for (int i = 0; i < 10; i++) {
20         [imgArr addObject:[UIImage imageNamed:[NSString stringWithFormat:@"00%d.jpg", i]]];
21     }
22     
23     // 创建YHView对象
24     self.yhView = [[YHView alloc] initWithFrame:[UIScreen mainScreen].bounds andImgArr:imgArr];
25     [self addSubview:self.yhView];
26 }
27 
28 @end

 1 #import "RootViewController.h"
 2 #import "RootView.h"
 3 #define kCount self.rootView.yhView.imgArr.count
 4 #define kWidth self.rootView.frame.size.width
 5 #define kHeight self.rootView.frame.size.height
 6 
 7 @interface RootViewController () <UIScrollViewDelegate>
 8 @property (nonatomic, strong) RootView *rootView;
 9 //@property (nonatomic, assign) int index;
10 
11 @end
12 
13 @implementation RootViewController
14 
15 - (void)loadView {
16     self.rootView = [[RootView alloc] initWithFrame:[UIScreen mainScreen].bounds];
17     self.view = self.rootView;
18     
19     //self.index = 0;
20 }
21 
22 
23 - (void)viewDidLoad {
24     [super viewDidLoad];
25     
26     self.rootView.yhView.scroll.delegate = self;
27     
28     // 给page添加事件
29     [self.rootView.yhView.page addTarget:self action:@selector(pageAction:) forControlEvents:UIControlEventValueChanged];
30     
31     // 添加计时器
32     [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(timerAction:) userInfo:nil repeats:YES];
33     
34 }
35 
36 
37 // 实现代理方法
38 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
39     NSInteger temp = self.rootView.yhView.scroll.contentOffset.x / kWidth;
40     
41     if (temp == 0) {
42         self.rootView.yhView.page.currentPage = kCount - 1;
43         self.rootView.yhView.scroll.contentOffset = CGPointMake(kCount * kWidth, 0);
44     } else if (temp > 0 && temp < kCount + 1) {
45         self.rootView.yhView.page.currentPage = temp - 1;
46     } else {
47         self.rootView.yhView.page.currentPage = 0;
48         self.rootView.yhView.scroll.contentOffset = CGPointMake(kWidth, 0);
49     }
50 
51 }
52 
53 
54 // 实现page事件
55 - (void)pageAction:(UIPageControl *)page {
56     
57     [self.rootView.yhView.scroll setContentOffset:CGPointMake(kWidth * (page.currentPage + 1), 0) animated:YES];
58 }
59 
60 
61 // 实现计时器事件
62 - (void)timerAction:(NSTimer *)timer {
63     NSInteger temp = self.rootView.yhView.scroll.contentOffset.x / kWidth;
64     //self.index = (int)temp;
65     
66     // 图片播到最后一张，无动画，将偏移量设置到第二张图片（也就是视觉上的第一张）
67     if (temp == kCount + 1) {
68         self.rootView.yhView.scroll.contentOffset = CGPointMake(kWidth, 0);
69         //self.index = 1;
70         temp = 1;
71     }
72     
73     // 有动画，将图片滚动到第三张（也就是视觉上的第二张）
74     [self.rootView.yhView.scroll setContentOffset:CGPointMake(kWidth * (temp + 1), 0) animated:YES];
75     
76     // 设置小圆点位置
77     if (temp == kCount) {
78         self.rootView.yhView.page.currentPage = 0;
79     } else {
80         self.rootView.yhView.page.currentPage = temp;
81     }
82 }
83 
84 
85 @end