图片滚动

 

 

 

 

      

#import "FIrstViewController.h"

 

@interface FIrstViewController () {

    UIScrollView *mainSV;

}

 

@end

 

@implementation FIrstViewController

 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        // Custom initialization

    }

    return self;

}

 

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.

    if ([self respondsToSelector:@selector(setAutomaticallyAdjustsScrollViewInsets:)]) {

        self.automaticallyAdjustsScrollViewInsets = NO;

    }

    

    self.navigationItem.title = @"第1个";

    

    //上面的scrollview

    UIScrollView *upSV = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 60, 320, 150)];

    upSV.contentSize = CGSizeMake(400, 150);//设置区域

    for (int i = 0; i < 4; i++) {//把图片放进去

        UIImageView *iv = [[UIImageView alloc]initWithFrame:CGRectMake(i*100, 0, 100, 150)];

        iv.userInteractionEnabled = YES;

        iv.tag = i+10;

        iv.image = [UIImage imageNamed:[NSString stringWithFormat:@"%d",i]];

        [upSV addSubview:iv];

        

        //给图片添加点击事件

        UITapGestureRecognizer *tgr = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(upPicClick:)];

        [iv addGestureRecognizer:tgr];

        [tgr release];

    }

    [self.view addSubview:upSV];

    [upSV release];

    

    //下面的大sv

    mainSV = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 210, 320, 480-210)];

    mainSV.contentSize = CGSizeMake(320*4, 480-210);//设置区域

    mainSV.pagingEnabled = YES;

    for (int i = 0; i < 4; i++) {//把图片放进去

        UIImageView *iv = [[UIImageView alloc]initWithFrame:CGRectMake(i*320, 0, 320, 480-210)];

        iv.image = [UIImage imageNamed:[NSString stringWithFormat:@"%d",i]];

        [mainSV addSubview:iv];

    }

    mainSV.delegate = self;//设置代理

    [self.view addSubview:mainSV];

    

    NSArray *picArr = @[[UIImage imageNamed:@"btn_prepage"],[UIImage imageNamed:@"btn_home"],[UIImage imageNamed:@"btn_nextpage"]];

    for (int i = 0; i < 3; i++) {

        UIButton *bu = [UIButton buttonWithType:UIButtonTypeCustom];

        bu.frame = CGRectMake(10+i*(92+45), 480-55, 45, 45);

        [bu setImage:[picArr objectAtIndex:i] forState:UIControlStateNormal];

        bu.tag = 100+i;

        [bu addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];

        [self.view addSubview:bu];

    }

    

}

 

-(void)buttonClick:(UIButton *)sender

{

    //当前是在第几页(从0开始)

    int f = (int)mainSV.contentOffset.x/320;

    

    if (sender.tag == 100) {

        //上一个

        if (f < 1) {

            //如果当前是第0个就不执行方法

            return;

        }

        f--;

    } else if (sender.tag == 101) {

        //首页

        f = 0;

    } else {

        //下一个

        if (f > 2) {

            //如果是最后一个就不执行

            return;

        }

        f++;

    }

    

    [mainSV setContentOffset:CGPointMake(320*f, 0) animated:YES];

    

    //从1开始

    self.navigationItem.title = [NSString stringWithFormat:@"第%d个",f+1];

}

 

- (void)upPicClick:(UITapGestureRecognizer *)tgr

{//小图片的点击事件

    UIImageView *iv = (UIImageView *)tgr.view;

    

    self.navigationItem.title = [NSString stringWithFormat:@"第%d个",iv.tag-9];

    

    [mainSV setContentOffset:CGPointMake((iv.tag-10)*320, 0) animated:YES];

}

 

//delegate方法，scrollView停止滑动时调用

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

{

    //contentOffset代表scrollView的偏移量，也就是x移动了多少，y移动了多少

    CGFloat f = scrollView.contentOffset.x;

    self.navigationItem.title = [NSString stringWithFormat:@"第%g个",f/320+1];

}

 

 

- (void)dealloc

{

    [mainSV release];

    mainSV = nil;

    [super dealloc];

}