iOS之OC源码,相册循环查看功能的实现


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#import"ViewController.h"

#import"YZUIScrollView.h"

#define kuan ([UIScreen mainScreen].bounds.size.width+20)

#define gao [UIScreen mainScreen].bounds.size.height

@interfaceViewController ()

@property (weak,nonatomic)IBOutletUIScrollView *huaBu;

@property(nonatomic,strong)NSArray *images;

@property(nonatomic)NSInteger currentIndex;

@end

@implementation ViewController

//懒加载,调用get方法时对属性进行初始化

-(NSArray *)images

{

   if(_images==nil)

    {

       NSMutableArray *imagearray=[NSMutableArrayarray];

       for (int i=1; i<7; i++) {

           NSString *imageName=[NSStringstringWithFormat:@"new_feature_%d",i];

           UIImage *image=[UIImageimageNamed:imageName];

            [imagearrayaddObject:image];

        }

       _images=imagearray;

    }

   return_images;

}

- (void)viewDidLoad {

    [superviewDidLoad];

   //设置UIScrollView的contentSize

   _huaBu.contentSize=CGSizeMake(kuan*3,gao);

   //设置分页

   _huaBu.pagingEnabled=YES;

   //隐藏水平滚动栏和垂直滚动栏

   _huaBu.showsHorizontalScrollIndicator=NO;

   _huaBu.showsVerticalScrollIndicator=NO;

   //设置背景颜色,突出不同的图片

   _huaBu.backgroundColor=[UIColorblackColor];

   //设置代理要遵守协议

   _huaBu.delegate=self;

   //调用方法添加子视图

    [selftianJiaZiShiTu];

   //调用方法添加图片

    [selftianJiaTuPian];

}

//添加子视图的方法

-(void)tianJiaZiShiTu

{

   //相册的话,是一个大的UIScrollView中放了很多的小UIScrollView,但是为了节省内存空间,所以只是添加了三个UIScrollView(图片不停的变换位置)

   for (int i=0; i<3; i++) {

       //创建YZUIScrollView

       YZUIScrollView * yzuisv=[[YZUIScrollViewalloc]initWithFrame:CGRectMake(kuan*i, 0,kuan-20,gao)];

       //添加YZUIScrollView

        [_huaBuaddSubview:yzuisv];

       //设置tag值,便于区分

        yzuisv.tag=1000+i;

    }

}

//添加方法的图片

-(void)tianJiaTuPian

{

   YZUIScrollView *leftSC=(YZUIScrollView *)[_huaBuviewWithTag:1000];

   YZUIScrollView *middleSC=(YZUIScrollView *)[_huaBuviewWithTag:1001];

   YZUIScrollView *rightSC=(YZUIScrollView *)[_huaBuviewWithTag:1002];

    leftSC.image=self.images[[selfindexFofEnable:_currentIndex-1]];

    middleSC.image=self.images[[selfindexFofEnable:_currentIndex]];

    rightSC.image=self.images[[selfindexFofEnable:_currentIndex+1]];

   //设置偏移量,这步很重要

   _huaBu.contentOffset=CGPointMake(kuan, 0);

}

//确保索引可用

-(NSInteger)indexFofEnable:(NSInteger)index

{

   if(index<0)

    {

       returnself.images.count-1;

    }

   elseif (index>self.images.count-1)

    {

       return 0;

    }

   else

       return index;

}

//滚动结束后,把所有的缩放视图比例还原为1.0

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

{

   for (id objin_huaBu.subviews) {

       if([objisKindOfClass:[UIScrollViewclass]])

        {

           UIScrollView *scaleSC=(UIScrollView *)obj;

            scaleSC.zoomScale=1.0;

        }

    }

   //判断左右滑动

   //偏移量的x为0,就是说明向右滑动了,就是看的之前左边的那张图片

   if(scrollView.contentOffset.x==0)

    {

       //对应的图像应该是变成左边的图像

       _currentIndex--;

    }

   //偏移量的x为两个屏幕的宽,就是说明向左滑动了,就是看的之前右边的那张图片

   elseif(scrollView.contentOffset.x==kuan*2)

    {

       //对应的图像应该是变成右边的图像

       _currentIndex++;

    }

   _currentIndex=[selfindexFofEnable:_currentIndex];

    [selftianJiaTuPian];

}

- (void)didReceiveMemoryWarning {

    [superdidReceiveMemoryWarning];

   // Dispose of any resources that can be recreated.

}

@end

//第二个类

#import"YZUIScrollView.h"

@interfaceYZUIScrollView ()

@property(nonatomic,strong)UIImageView *imageview;

@property(nonatomic,strong)UIImage *image;//内容视图的图片

@end

@implementation YZUIScrollView

-(instancetype)initWithFrame:(CGRect)frame

{

   if(self =[superinitWithFrame:frame])

    {

       //添加内容视图

       UIImageView *imageview1=[[UIImageViewalloc]initWithFrame:self.bounds];

        [selfaddSubview:imageview1];

       _imageview=imageview1;

       //设置最大最小倍数和代理

       self.minimumZoomScale=0.5;

       self.maximumZoomScale=1.5;

       self.delegate=self;

       //双击事件

       UITapGestureRecognizer *tap=[[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(shuangJi:)];

        tap.numberOfTapsRequired=2;

        [selfaddGestureRecognizer:tap];

    }

   returnself;

}

-(void)shuangJi:(UITapGestureRecognizer *)tap

{

   //当缩放比例不为1.0,还原缩放比例

   if (self.zoomScale !=1.0) {

        [selfsetZoomScale:1.0animated:YES];

       return ;

    }

   CGPoint location =[taplocationInView:self];

   CGRect rect =CGRectMake(location.x-100, location.y-100,200,200);

    [selfzoomToRect:rectanimated:YES];

}

//重写setImg方法

-(void)setImage:(UIImage *)image

{

   //set本身的方法要完成的事必须完成

   _image=image;

   //设置内容视图的图片

   _imageview.image=image;

}

//UIScrollViewDelegate代理方法

-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

{

   return_imageview;

}

@end


新闻标题:iOS之OC源码,相册循环查看功能的实现
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