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