//

//  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