UI1_ScrollViewHomeWork

//
//  AppDelegate.m
//  UI1_ScrollViewHomeWork
//
//  Created by zhangxueming on 15/7/13.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "AppDelegate.h"
#import "ViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    ViewController *root = [[ViewController alloc] init];
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:root];
    self.window.rootViewController = nav;
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];

    return YES;
}

//
//  ViewController.h
//  UI1_ScrollViewHomeWork
//
//  Created by zhangxueming on 15/7/13.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UIScrollViewDelegate>

@end

//
//  ViewController.m
//  UI1_ScrollViewHomeWork
//
//  Created by zhangxueming on 15/7/13.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()
{
    UIScrollView *_indexScrollView;
    UIScrollView *_scrollView;
    NSInteger _currentIndex; //记录当前显示的图片
    NSMutableArray *_imageArray;     //存储图片
}

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    _currentIndex = 0;
    _imageArray = [NSMutableArray array];
    for (int i=0; i<10; i++) {
        NSString *pictureName = [NSString stringWithFormat:@"superCar%i", i];
        NSString *path = [[NSBundle mainBundle] pathForResource:pictureName ofType:@"png"];
        UIImage *image = [UIImage imageWithContentsOfFile:path];
        [_imageArray addObject:image];
    }

    _indexScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(10,64, self.view.frame.size.width-20, 80)];
    _indexScrollView.bounces = NO;
    self.automaticallyAdjustsScrollViewInsets = NO;

    CGFloat indexImageViewWidth = (self.view.frame.size.width-20)/4;
    CGFloat indexImageViewHeight= 80;

    for (int i=0; i<10; i++) {
        UIImageView *imageView = [[UIImageView alloc] initWithImage:_imageArray[i]];
        imageView.frame = CGRectMake(i*indexImageViewWidth, 0, indexImageViewWidth, indexImageViewHeight);
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapIndexImageView:)];
        imageView.userInteractionEnabled = YES;
        imageView.tag = 100+i;
        [imageView addGestureRecognizer:tap];

        [_indexScrollView addSubview:imageView];
    }
    _indexScrollView.showsHorizontalScrollIndicator = NO;
    _indexScrollView.showsVerticalScrollIndicator = NO;
    _indexScrollView.contentSize = CGSizeMake(10*indexImageViewWidth, indexImageViewHeight);

    [self.view addSubview:_indexScrollView];

    CGFloat scrollViewWidth  = self.view.frame.size.width-20;
    CGFloat scrollViewHeight = 400;
    _scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(10, 80+64, scrollViewWidth, scrollViewHeight)];
    for (int i=0; i<10; i++) {
        UIImageView *imageView = [[UIImageView alloc] initWithImage:_imageArray[i]];
        imageView.frame = CGRectMake(scrollViewWidth*i, 0, scrollViewWidth, scrollViewHeight);
        [_scrollView addSubview:imageView];
    }
    _scrollView.contentSize = CGSizeMake(scrollViewWidth*10, scrollViewHeight);
    _scrollView.showsVerticalScrollIndicator = NO;
    _scrollView.showsHorizontalScrollIndicator  = NO;
    _scrollView.bounces = NO;
    _scrollView.pagingEnabled = YES;

    //设置代理
    _scrollView.delegate = self;

    [self.view addSubview:_scrollView];
}

- (void)tapIndexImageView:(UITapGestureRecognizer *)tap
{
    UIImageView *imageView = (UIImageView *)tap.view;
    _currentIndex = imageView.tag-100;
    [_scrollView setContentOffset:CGPointMake((self.view.frame.size.width-20)*_currentIndex, 0) animated:YES];
}
#pragma mark ---ScrollViewDelegate---

//分页使能的话, 该方法一定被调用
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    NSLog(@"---------");
    _currentIndex = scrollView.contentOffset.x/(self.view.frame.size.width-20);
    NSLog(@"currentIndex = %li", _currentIndex);
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end