电子书阅读器开发（一）

从今天开始陪大家一起开发一款电子书阅读器，主要是想帮助初学者快速入门ios。

首先解决两个问题：1.对txt文件分页 2.实现翻页的效果

 1 -(NSString *)readStrFromTxt:(NSString *)fileName
 2 {
 3     NSError *error;
 4     
 5     NSString *textFileContents = [NSString
 6                                   
 7                                   stringWithContentsOfFile:[[NSBundle mainBundle]
 8                                                             
 9                                                             pathForResource:fileName
10                                                             
11                                                             ofType:@"txt"]
12                                   
13                                   encoding:NSUTF8StringEncoding
14                                   
15                                   error: & error];
16     
17     // If there are no results, something went wrong
18     
19     if (textFileContents == nil) {
20         
21         // an error occurred
22         
23         NSLog(@"Error reading text file. %@", [error localizedFailureReason]);
24         
25     }
26     
27     return textFileContents;
28 }

读取txt文本文件，并且转化为字符串

1 bRect=CGRectMake(BOOK_LEFT, BOOK_TOP, BOOK_WIDTH, BOOK_HEIGHT);
2 allStr=[self readStrFromTxt:@"aizaixianjingderizi"];
3 NSArray *arrContent=[allStr componentsSeparatedByString:@"　　"];
4 NSString *curCotentLine=@"";
5 for (int i=0; i<10; i++) {
6    NSString *tempStr=[arrContent objectAtIndex:i];
7    NSLog(@"tempStr.length:%d",tempStr.length);
8    curCotentLine=[NSString stringWithFormat:@"%@%@",curCotentLine,tempStr];
9 }

分行显示txt文件的内容

分页显示我们使用pageconroller这个控件

 1 // 设置UIPageViewController的配置项
 2     NSDictionary *options =[NSDictionary dictionaryWithObject:[NSNumber numberWithInteger:UIPageViewControllerSpineLocationMin]
 3                                                        forKey: UIPageViewControllerOptionSpineLocationKey];
 4     // 实例化UIPageViewController对象，根据给定的属性
 5     _pageController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl
 6                                                           navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal
 7                                                                         options: options];
 8     // 设置UIPageViewController对象的代理
 9     _pageController.dataSource = self;
10     
11     
12     // 定义“这本书”的尺寸
13     [[_pageController view] setFrame:[[self view] bounds]];
14 
15     
16     // 让UIPageViewController对象，显示相应的页数据。
17     // UIPageViewController对象要显示的页数据封装成为一个NSArray。
18     // 因为我们定义UIPageViewController对象显示样式为显示一页（options参数指定）。
19     // 如果要显示2页，NSArray中，应该有2个相应页数据。
20     initialViewController =[[UIViewController alloc]init];// 得到第一页
21     UITextView *txtView=[[UITextView alloc]initWithFrame:bRect];
22     txtView.text=curCotentLine;
23     [initialViewController.view addSubview:txtView];
24     
25     NSArray *viewControllers =[NSArray arrayWithObject:initialViewController];
26     [_pageController setViewControllers:viewControllers
27                               direction:UIPageViewControllerNavigationDirectionForward
28                                animated:NO
29                              completion:nil];
30     
31     // 在页面上，显示UIPageViewController对象的View
32     [self addChildViewController:_pageController];
33     [[self view] addSubview:[_pageController view]];

下面是pageconroller里面的委托函数

 1 #pragma mark- UIPageViewControllerDataSource
 2 
 3 // 返回上一个ViewController对象
 4 - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController{
 5     
 6     UIViewController *beforeControl=[[UIViewController alloc]init];
 7     
 8     if(curIndex>WORD_COUNT)
 9     {
10         curPage--;
11         
12         curIndex-=WORD_COUNT;
13 
14         UITextView *beforeTxt=[[UITextView alloc]initWithFrame:bRect];
15         NSString *beforeStr=[allStr substringWithRange:NSMakeRange(curIndex, WORD_COUNT)];
16         beforeTxt.text=beforeStr;
17         
18         NSArray *arrContent=[allStr componentsSeparatedByString:@"　　"];
19         NSString *curCotentLine=@"";
20         for (int i=0; i<10; i++) {
21             NSString *tempStr=[arrContent objectAtIndex:i+curPage*10];
22             curCotentLine=[NSString stringWithFormat:@"%@%@",curCotentLine,tempStr];
23         }
24         beforeTxt.text=curCotentLine;
25         
26         NSLog(@"beforeStr:%@",beforeStr);
27         
28         [beforeControl.view addSubview:beforeTxt];
29     }
30     
31     NSLog(@"curindex:%d",curIndex);
32     
33     return beforeControl;
34 }
35 
36 // 返回下一个ViewController对象
37 - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController{
38     
39     UIViewController *afterConrol=[[UIViewController alloc]init];
40     
41     if(curIndex+WORD_COUNT<allStr.length)
42     {
43         curPage++;
44         
45         UITextView *afterTxt=[[UITextView alloc]initWithFrame:bRect];
46         NSString *afterStr=[allStr substringWithRange:NSMakeRange(curIndex,WORD_COUNT)];
47         afterTxt.text=afterStr;
48         
49         NSLog(@"afterStr:%d",afterStr.length);
50         
51         NSArray *arrContent=[allStr componentsSeparatedByString:@"　　"];
52         NSString *curCotentLine=@"";
53         for (int i=0; i<10; i++) {
54             NSString *tempStr=[arrContent objectAtIndex:i+curPage*10];
55             curCotentLine=[NSString stringWithFormat:@"%@%@",curCotentLine,tempStr];
56         }
57         afterTxt.text=curCotentLine;
58         
59         [afterConrol.view addSubview:afterTxt];
60         
61         curIndex+=WORD_COUNT;
62     }
63     
64     NSLog(@"curindex:%d",curIndex);
65     
66     return afterConrol;
67 }

分别是翻页时候的显示效果。。。。今天就写到这了。。。。。未完待续。。。。。。下面附上效果截图。。。。。。

电子书阅读器开发 （一）

电子书阅读器开发（一）