• iOS实现三屏复用循环广告[从服务器请求的广告]


    循环广告我们在开发中已经是熟得不能再熟了,今天整理这篇scrollview三屏复用广告

    原理使用scrollview里的三个imageview分别去加载不同的图片,用少量的资源来显示大量或不确定的广告数量,不然如果用普通方法实现广告,难道10个广告用12个scrollview的contentsize去做,岂不是太浪费资源了

    代码如下,实现所有数量的循环广告,当广告只有一个时,仅采用单图显示,>=2个广告时,自动采用三屏复用

    这里添加图片的方式是通过网络请求,更新服务器上的广告,如果仅使用本地广告,可以将.m文件里的全部图片的添加方式

    如:

    self.endImageView.image = self.imageArray[endImageCount];
    修改为
    self.endImageView.image = [UIImage imageNamed:self.imageArray[endImageCount]];
    然后在使用该类时,直接将本地图片的名字用数组传过去就行了,如
    cview.imageArray = [[NSMutableArray alloc]initWithObjects:@"图片1",@"图片2",@"图片3", nil];

    或者不改则使用方法如

    NSArray *imageArr = [[NSArray alloc]initWithObjects:@"banner_理财.jpg",@"banner_惠普",@"banner_炒股", nil];

        for (int i=0; i<3; i++) {

            UIImage *cirImage1 = [UIImage imageNamed:imageArr[i]];

            [cirScrollView.imageArray addObject:cirImage1];

        }

    如果图片给的是地址那可以用imageWithURL这个方法来获取图片

    下面讲从服务器获取的广告方式,请求服务器图片及解析这里就不讲了,仅从获取到的data数据后开始

    先新建一个类继承UIView,

    .h里

     1 #import <UIKit/UIKit.h>
     2 
     3 @interface CirculateScrollview : UIView
     4 
     5 @property (nonatomic,strong)NSMutableArray *imageArray;//图片数组
     6 @property (nonatomic,strong)UIScrollView *circulateScrollView;//广告
     7 
     8 /*
     9  三屏复用广告
    10  适用范围:网络请求或固定本地的广告图片
    11         适用所有数量广告,广告>=2时自动采用三屏复用技术
    12  使用方法:例
    13  在需要添加广告的控制器里面
    14  
    15  CirculateScrollview *cview = [[CirculateScrollview alloc]initWithFrame:CGRectMake(0, 20, 320, 200)];
    16  for (int i=0; i<3; i++) {
    17  UIImage *image = [UIImage imageNamed:@"旅行图1"];//传进图片名字方式
    18  //UIImage *image = UIImage imageWithData:data];//传进data数据图片方式将服务器请求到的data数据图片转换成image形式再传输
    19  [cview.imageArray addObject:image];
    20  }
    21  [self.view addSubview:cview];
    22  
    23  */
    24 
    25 
    26 /*
    27  图片转换NSData方法
    28  测试可用
    29  NSData * data = UIImageJPEGRepresentation(image, 1);
    30  */
    31 
    32 @end

    .m文件里

    实现方法是这三个成员变量,用来读取传输过来的图片在数组中的位置,三屏复用里,我们显示的位置是scrollview的中间位置,左边广告是全部广告的最后一个,中间显示第一个,右边的显示第二个,然后根据左滑成员变量递增,当变量递增到超过广告总数时,重新赋值第一个广告,而右滑递减,递减至-1时,即不在数组范围时,重新赋值广告数组的最后一个

      1 #import "CirculateScrollview.h"
      2 
      3 #define ViewWidth self.frame.size.width
      4 #define ViewHeight self.frame.size.height
      5 #define AllImageCount self.imageArray.count-1
      6 
      7 @interface CirculateScrollview()<UIScrollViewDelegate>
      8 {
      9     NSInteger endImageCount;//左边图片
     10     NSInteger oneImageCount;//中间图片[当前看到的图片]
     11     NSInteger secondImageCount;//右边图片
     12 }
     13 @property (nonatomic,strong)UIImageView *endImageView;
     14 @property (nonatomic,strong)UIImageView *oneImageView;
     15 @property (nonatomic,strong)UIImageView *secondImageView;
     16 @property (nonatomic,strong)UIPageControl *pageCtl;
     17 
     18 @end
     19 
     20 @implementation CirculateScrollview
     21 
     22 
     23 -(id)initWithFrame:(CGRect)frame
     24 {
     25     self = [super initWithFrame:frame];
     26     if (self) {
     27         
     28     }
     29     return self;
     30 }
     31 
     32 -(NSMutableArray *)imageArray
     33 {
     34     if (!_imageArray) {
     35         _imageArray = [[NSMutableArray alloc]init];
     36     }
     37     return _imageArray;
     38 }
     39 
     40 - (void)drawRect:(CGRect)rect {
     41     self.circulateScrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, ViewWidth, ViewHeight)];
     42     
     43     endImageCount = self.imageArray.count-1;
     44     oneImageCount = 0;
     45     secondImageCount = 1;
     46     
     47     self.circulateScrollView.showsHorizontalScrollIndicator = NO;
     48     self.circulateScrollView.pagingEnabled = YES;
     49     self.circulateScrollView.delegate = self;
     50     self.circulateScrollView.bounces = NO;
     51     
     52     self.circulateScrollView.contentOffset = CGPointMake(ViewWidth, 0);
     53     
     54     self.backgroundColor = [UIColor whiteColor];
     55     
     56     if (!self.imageArray.count) {
     57         NSLog(@"图片数组为空");
     58         return;
     59     }
     60     
     61     
     62     //若广告数量少于2张则不采用三屏复用技术
     63     if (self.imageArray.count<=1){
     64         self.circulateScrollView.contentSize = CGSizeMake(ViewWidth, ViewHeight);
     65         
     66         self.endImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, ViewWidth, ViewHeight)];
     67         self.endImageView.image = self.imageArray[endImageCount];
     68         [self.circulateScrollView addSubview:self.endImageView];
     69         [self addSubview:self.circulateScrollView];
     70         
     71     }else{
     72         self.circulateScrollView.contentSize = CGSizeMake(ViewWidth*3, ViewHeight);
     73         
     74         //
     75         self.endImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, ViewWidth, ViewHeight)];
     76         self.endImageView.image = self.imageArray[endImageCount];
     77         [self.circulateScrollView addSubview:self.endImageView];
     78         //
     79         self.oneImageView = [[UIImageView alloc]initWithFrame:CGRectMake(ViewWidth, 0, ViewWidth, ViewHeight)];
     80         self.oneImageView.image = self.imageArray[oneImageCount];
     81         [self.circulateScrollView addSubview:self.oneImageView];
     82         //
     83         self.secondImageView = [[UIImageView alloc]initWithFrame:CGRectMake(ViewWidth*2, 0, ViewWidth, ViewHeight)];
     84         self.secondImageView.image = self.imageArray[secondImageCount];
     85         [self.circulateScrollView addSubview:self.secondImageView];
     86         
     87         
     88         [self addSubview:self.circulateScrollView];
     89         [self pageNumControl];
     90     }
     91 
     92 }
     93 //添加页符
     94 -(void)pageNumControl
     95 {
     96     self.pageCtl = [[UIPageControl alloc]initWithFrame:CGRectMake(0, ViewHeight-20, ViewWidth, 20)];
     97     self.pageCtl.backgroundColor = [UIColor lightGrayColor];
     98     self.pageCtl.currentPageIndicatorTintColor = [UIColor greenColor];
     99     self.pageCtl.pageIndicatorTintColor = [UIColor whiteColor];
    100     self.pageCtl.alpha = 0.7;
    101     self.pageCtl.numberOfPages = AllImageCount+1;
    102     [self addSubview:self.pageCtl];
    103 }
    104 
    105 -(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
    106 {
    107     if (scrollView.contentOffset.x == 0) {
    108         endImageCount--;
    109         oneImageCount--;
    110         secondImageCount--;
    111         if (endImageCount<0) {
    112             endImageCount = AllImageCount;
    113         }else if (oneImageCount<0){
    114             oneImageCount = AllImageCount;
    115         }
    116         //适配2张图片
    117         if (secondImageCount<0){
    118             secondImageCount = AllImageCount;
    119         }
    120         //NSLog(@"endImageCount=%ld  oneImageCount=%ld  secondImageCount=%ld",endImageCount,oneImageCount,secondImageCount);
    121         
    122     }else if(scrollView.contentOffset.x == ViewWidth*2){
    123         endImageCount++;
    124         oneImageCount++;
    125         secondImageCount++;
    126         if (endImageCount>AllImageCount) {
    127             endImageCount = 0;
    128         }else if (oneImageCount>AllImageCount){
    129             oneImageCount = 0;
    130         }
    131         //适配2张图片
    132         if (secondImageCount>AllImageCount){
    133             secondImageCount = 0;
    134         }
    135     }
    136     //重新加载显示当前位置的图片
    137     scrollView.contentOffset = CGPointMake(ViewWidth, 0);
    138     self.endImageView.image = self.imageArray[endImageCount];
    139     self.oneImageView.image = self.imageArray[oneImageCount];
    140     self.secondImageView.image = self.imageArray[secondImageCount];
    141     self.pageCtl.currentPage = oneImageCount;
    142 }
    143 
    144 @end
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  • 原文地址:https://www.cnblogs.com/fcug/p/5192074.html
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