在 Xcode 的文本视图中处理多个 txt 文件的最佳方法是什么？

Question

这是我的想法。我有大约 100 个 txt 文件，需要在用户单击工具栏中的下一个按钮后在文本视图中显示。下一个按钮也会触发随机数，因此文件将随机显示。我已通过生成随机数并使用“case”根据该数字分配文件来完成下面的代码。下面的示例使用 4 个 txt 文件，如果我有 100 个 txt 文件怎么办？有没有通用的方法来开发代码，而不是我必须写到“case”99？ 请指教。

- (IBAction)Next:(id)sender {

// generate random number   
    int randomnumber = (arc4random() % (3));

//assign the number based on file number 
    switch (randomnumber) {
        case 0:
        {
            NSString *filePath=[[NSBundle mainBundle] pathForResource:@"file_no_1" ofType:@"txt"];
            NSString *myText= [NSString stringWithContentsOfFile:filePath
                                                        encoding:NSUTF8StringEncoding
                                                           error:nil];
            TextView.text=myText;
        }
            break;
        case 1:
        {
            NSString *filePath=[[NSBundle mainBundle] pathForResource:@"file_no_2" ofType:@"txt"];
            NSString *myText= [NSString stringWithContentsOfFile:filePath
                                                        encoding:NSUTF8StringEncoding
                                                           error:nil];
            TextView.text=myText;
        }
            break;
        case 2:
        {
            NSString *filePath=[[NSBundle mainBundle] pathForResource:@"file_no_3" ofType:@"txt"];
            NSString *myText= [NSString stringWithContentsOfFile:filePath
                                                        encoding:NSUTF8StringEncoding
                                                           error:nil];
            TextView.text=myText;
        }
            break;
        case 3:
        {
            NSString *filePath=[[NSBundle mainBundle] pathForResource:@"file_no_4" ofType:@"txt"];
            NSString *myText= [NSString stringWithContentsOfFile:filePath
                                                        encoding:NSUTF8StringEncoding
                                                           error:nil];
            TextView.text=myText;
        }
            break;

        default:
            break;
    }


}

Answer 1

- (IBAction)Next:(id)sender 
{
  //generate random number - result is a range of 0-99   
  int randomnumber = (arc4random() % 100);
  //render a filename based on that number ("file_no_1" - "file_no_100")
  NSString *fileName = [NSString stringWithFormat:@"file_no_%d", randomnumber + 1];
  //show the filename within our console
  NSLog(@"current filename:%@", fileName);
  //render a complete file-path out of our filename, the main-bundle and the file-extension
  NSString *filePath=[[NSBundle mainBundle] pathForResource:fileName ofType:@"txt"];
  //fetch the text content from that file
  NSString *myText= [NSString stringWithContentsOfFile:filePath
                                                        encoding:NSUTF8StringEncoding
                                                           error:nil];
  //hand that text over to our textview
  TextView.text=myText;

 //done - yet another dude got his homework done by someone else...
 //...damn lucky that dude, as I had such a pleasant day
}