将CSV文件保存到文档目录文件夹

Question

我正在编写一个注册应用程序，它应该将CSV文件保存在文档目录文件夹中。我想查看输出并查看在Excel中打开CSV文件时会发生什么。我通过使用以下代码片段找到应该保存的位置来导航到文档目录文件夹：

NSLog(@"Info Saved");
NSLog(@"Documents Directory: %@", [[[NSFileManager defaultManager]
                                    URLsForDirectory:NSDocumentDirectory
                                    inDomains:NSUserDomainMask] lastObject]);

这是我为注册表单中的11个文本字段保存信息的代码：

- (IBAction)saveFormButton:(id)sender {

// saves text field data in comma separated CSV file format
NSString *formData = [NSString stringWithFormat:@"%@,%@,%@,%@,%@,%@,%@,%@,%@,%@,%@\n",
                      self.nameTextfield.text, self.emailTextfield.text,
                      self.phoneTextfield.text, self.termTextfield.text,
                      self.schoolTextfield.text, self.graduationTextfield.text,
                      self.gpaTextfield.text, self.degreeTextfield.text,
                      self.interestTextfield.text, self.groupTextfield.text,
                      self.appliedTextfield.text];

// get document directory path
NSString *documentDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                    NSUserDomainMask, YES)objectAtIndex:0];

// append results.csv onto doc path
NSString *event = [documentDirectoryPath stringByAppendingString:@"results.csv"];

// creates folder if it does not exist
if (![[NSFileManager defaultManager] fileExistsAtPath:documentDirectoryPath]) {
    [[NSFileManager defaultManager] createFileAtPath:event contents:nil attributes:nil];
}


NSFileHandle *fileHandle = [NSFileHandle fileHandleForUpdatingAtPath:event];
[fileHandle seekToEndOfFile];
[fileHandle writeData:[formData dataUsingEncoding:NSUTF8StringEncoding]];
[fileHandle closeFile];

我应该在我导航到的特定文件夹中看到一个文件吗？

谢谢您的帮助，

- Alex Cauthen

---

我忘了提到，我非常新手iOS开发。 - Alex Cauthen

Answer 1

更改此行：

NSString *event = [documentDirectoryPath stringByAppendingString:@"results.csv"];

to:

NSString *event = [documentDirectoryPath stringByAppendingPathComponent:@"results.csv"];

这可以确保路径格式正确。此外，您似乎是在创建文件之前检查“documentDirectoryPath”是否存在，而不是检查文件名本身。请更改为：

if (![[NSFileManager defaultManager] fileExistsAtPath:documentDirectoryPath]) {
    [[NSFileManager defaultManager] createFileAtPath:event contents:nil attributes:nil];
}

to:

if (![[NSFileManager defaultManager] fileExistsAtPath:event]) {
    [[NSFileManager defaultManager] createFileAtPath:event contents:nil attributes:nil];
}

- Andrew M

Answer 2

这里是一种更为优雅的方式，代码更少

 // Content of file
 NSString* str= @"str,hey,so,good";

 // Writing    
 NSString *root = [NSHomeDirectory() stringByAppendingPathComponent:@"file.csv"];
 [str writeToFile:root atomically:YES encoding:NSUTF8StringEncoding error:NULL];

 // Reading
 NSString *string = [[NSString alloc] initWithContentsOfFile:root encoding:NSUTF8StringEncoding error:nil];

 NSLog(@"%@",string);

结果:

2015-07-15 15:52:56.267 ObjC[2927:15828] str,hey,so,good

- Alaeddine