iOS之OC源码,相册循环查看功能的实现
2016-01-13 20:32
627 查看
#import "ViewController.h"#import "YZUIScrollView.h"#define kuan ([UIScreen mainScreen].bounds.size.width+20)#define gao [UIScreen mainScreen].bounds.size.height@interface ViewController ()<UIScrollViewDelegate>@property (weak, nonatomic) IBOutlet UIScrollView *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=[NSMutableArray array]; for (int i=1; i<7; i++) { NSString *imageName=[NSString stringWithFormat:@"new_feature_%d",i]; UIImage *image=[UIImage imageNamed:imageName]; [imagearray addObject:image]; } _images=imagearray; } return _images;}- (void)viewDidLoad { [super viewDidLoad]; //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=[UIColor blackColor]; //设置代理要遵守协议<UIScrollViewDelegate> _huaBu.delegate=self; //调用方法添加子视图 [self tianJiaZiShiTu]; //调用方法添加图片 [self tianJiaTuPian];}//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=[[YZUIScrollView alloc] initWithFrame:CGRectMake(kuan*i, 0, kuan-20, gao)]; //添加YZUIScrollView [_huaBu addSubview: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 *)[_huaBu viewWithTag:1000]; YZUIScrollView *middleSC=(YZUIScrollView *)[_huaBu viewWithTag:1001]; YZUIScrollView *rightSC=(YZUIScrollView *)[_huaBu viewWithTag:1002]; leftSC.image=self.images[[self indexFofEnable:_currentIndex-1]]; middleSC.image=self.images[[self indexFofEnable:_currentIndex]]; rightSC.image=self.images[[self indexFofEnable:_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) { return self.images.count-1; } else if (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 obj in _huaBu.subviews) { if([obj isKindOfClass:[UIScrollView class]]) { 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 else if(scrollView.contentOffset.x== kuan*2) { //对应的图像应该是变成右边的图像 _currentIndex++; } _currentIndex=[self indexFofEnable:_currentIndex]; [self tianJiaTuPian];}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end//第二个类#import "YZUIScrollView.h"@interface YZUIScrollView ()<UIScrollViewDelegate>@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 =[super initWithFrame:frame]) { //添加内容视图 UIImageView *imageview1=[[UIImageView alloc] initWithFrame:self.bounds]; [self addSubview: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=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(shuangJi:)]; tap.numberOfTapsRequired=2; [self addGestureRecognizer:tap]; } return self;}-(void)shuangJi:(UITapGestureRecognizer *)tap{ //当缩放比例不为1.0,还原缩放比例 if (self.zoomScale !=1.0) { [self setZoomScale:1.0 animated:YES]; return ; } CGPoint location =[tap locationInView:self]; CGRect rect =CGRectMake(location.x-100, location.y-100,200,200); [self zoomToRect:rect animated: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
相关文章推荐
- 从源码安装Mysql/Percona 5.5
- 峰回路转,Firefox 浏览器即将重返 iOS 平台
- 峰回路转,Firefox 浏览器即将重返 iOS 平台
- 不可修补的 iOS 漏洞可能导致 iPhone 4s 到 iPhone X 永久越狱
- iOS 12.4 系统遭黑客破解,漏洞危及数百万用户
- 每日安全资讯:NSO,一家专业入侵 iPhone 的神秘公司
- [转][源代码]Comex公布JailbreakMe 3.0源代码
- 浅析Ruby的源代码布局及其编程风格
- asp.net 抓取网页源码三种实现方法
- JS 相册效果 自动播放[本地整合]
- JS小游戏之仙剑翻牌源码详解
- JS小游戏之宇宙战机源码详解
- jquery实现相册一下滑动两次的方法
- jQuery源码分析之jQuery中的循环技巧详解
- 本人自用的global.js库源码分享
- java中原码、反码与补码的问题分析
- 用dom+xhtml+css制作的一个相册效果代码打包下载
- 讲解iOS开发中基本的定位功能实现
- js判断客户端是iOS还是Android等移动终端的方法