ios-UIScrollView－常用属性和方法

_uiscroolview=[[UIScrollView alloc]init];
   
    if ([[UIDevice currentDevice].systemVersion floatValue]>6.2) {
      _uiscroolview.frame=CGRectMake(0, 0, 320, 480);
    }else{
      _uiscroolview.frame=CGRectMake(0, 0, 320, 400);
    }
    _uiscroolview.contentSize=CGSizeMake(320*2, 460);//设置内容的大小
    _uiscroolview.pagingEnabled=NO;//分页效果是否可用，默认为no
    _uiscroolview.bounces=YES;//是否有反弹效果，默认为yes
    _uiscroolview.indicatorStyle=UIScrollViewIndicatorStyleWhite;//滚动条风格
    [_uiscroolview flashScrollIndicators];//一显示就显示一下滚动条，用来提示用户的
    _uiscroolview.showsHorizontalScrollIndicator=YES;//显示滚动条
    _uiscroolview.backgroundColor=[UIColor redColor];
    _uiscroolview.contentInset=UIEdgeInsetsMake(20, 20, 50, 30);//4个参数,分别表示可以拉动的边缘扩展的大小,上，左，下，右
    _uiscroolview.scrollIndicatorInsets=UIEdgeInsetsMake(20, 20, 50, 30);//同上，不过，这4个参数是用来设置滚动条的,意义相同

-(void)touches:(UIButton*) bb{
    //[_uiscroolview setContentOffset:CGPointMake(320, 20) animated:YES];//在scroolview中，跳的位置，x320，y20
    [_uiscroolview scrollRectToVisible:CGRectMake(320, 200, 20, 20) animated:YES];//这个是跳转到一个区域,可见就可以了，没有指定是在中间还是哪
}

 //下面是一个简单得相册得放大缩小列子，原理本来一个scrollview只能放大缩小一张图，那么我们就将多个scrollview放到一个大地scrollview上

//
//  RootViewController.m
//  uiscorrview
//
//  Created by  liyang on 14-4-26.
//  Copyright (c) 2014年 liyang. All rights reserved.
//

#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
      
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    //先是添加了一个底部scrollview，因为一个scrollview只能放大一个view
    _basescrollview =[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 340, 460)];
    _basescrollview.backgroundColor=[UIColor blackColor];
    [self.view addSubview:_basescrollview];
    //设置能容大小
    _basescrollview.contentSize=CGSizeMake(340*4, 460);
    _basescrollview.pagingEnabled=YES;
    _basescrollview.showsVerticalScrollIndicator=NO;
    _basescrollview.showsHorizontalScrollIndicator=NO;
    _basescrollview.delegate=self;
    _basescrollview.tag=INT_MAX;
    
    
    
    int _x=0;
    for (int index=0; index<5; index++) {
        ImageScrollView *imagescrollview=[[ImageScrollView alloc]initWithFrame:CGRectMake(0+_x, 0, 320, 480)];
        NSString *imagename=[NSString stringWithFormat:@"%d.jpg",index+1];
        imagescrollview.tag=index;
        UIImage *iamge=[UIImage imageNamed:imagename];
        imagescrollview.imageview.image=iamge;
        imagescrollview.backgroundColor=[UIColor purpleColor];
        [_basescrollview addSubview:imagescrollview];
        _x+=340;
    }
}
//作用就是移动到下一张得时候改变原来得大小
    int pre=0;
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
   int current= _basescrollview.contentOffset.x/340;
    ImageScrollView *nowscrollview=(ImageScrollView *)[_basescrollview viewWithTag:pre];
    if (pre!=current&&nowscrollview.zoomScale>1.0) {
        nowscrollview.zoomScale=1.0;
    }
    pre=current;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    
}

@end

//
//  ImageScrollView.m
//  uiscorrview
//
//  Created by  liyang on 14-4-26.
//  Copyright (c) 2014年 liyang. All rights reserved.
//

#import "ImageScrollView.h"

@implementation ImageScrollView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        //设置图片
        _imageview=[[UIImageView alloc]initWithFrame:self.bounds];
     
        [self addSubview:_imageview];
        //设置代理
        self.delegate=self;
        //设置方法缩小的参数
        self.maximumZoomScale=4.0;
        self.minimumZoomScale=1;
        self.showsHorizontalScrollIndicator=NO;
        self.showsVerticalScrollIndicator=NO;
        //添加了一个手势动作
        UITapGestureRecognizer *taptwo=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapgesture:)];
        taptwo.numberOfTapsRequired=2;
        [self addGestureRecognizer:taptwo];
        
    }
    return self;
}
//手势事件
-(void)tapgesture:(UIGestureRecognizer *)gesture{

    if (self.zoomScale>=4.0) {
        [self setZoomScale:1.0 animated:YES];
    }else{
       CGPoint point= [gesture locationInView:self];
        [self zoomToRect:CGRectMake(point.x-40, point.y-40, 80, 80) animated:YES];
    
    }

}
//代理方法返回方法缩小的view的
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{

    return _imageview;
}
@end