如何在txt文件中编写iOS 7 [英] How to write in a txt-file, iOS 7

问题描述

我正在尝试制作适用于iOS 7的iPhone应用程序. 我已经在项目中创建了一个txt文件，并希望能够在按下写入"按钮时从txt文件写入文本，在按下读取"按钮时能够写入并读取数据，阅读.

I'm trying to make an iPhone app, for iOS 7. I've created a txt file in my project, and want to be able to write the text from the txt file, when I push the write-button, write, and be able to read data, when I push the read-button, read.

当我尝试读取数据时，我发现此方法有效:

I'v found this method working, when I try to read data:

- (IBAction)load:(id)sender {
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"text" ofType:@"txt"];
if (filePath) {
    NSString *stringFromFile = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
    [TextView setText:stringFromFile];
}

}

在另一个按钮上，我希望它将数据写入项目中的txt文件. 我已经尝试了很多方法，但没有真正起作用-简单地说，它不会在文件中写入文本. 我找到了一种方法，该方法可以解决50％的问题.这意味着它无法保存我要写的文本，仅显示将文本放在文本框中.

On another button, I want it to write data to the txt file in my project. I've tried a lot of methods, but no of really works - it simple won't write text in the file. I've found one method, which works 50%. That means that it's not able to save the text I'm telling it to write, it only shows that it put's the text in the text box.

代码:

- (IBAction)write:(id)sender {

    NSString *documentsDirectory = [NSHomeDirectory()
                                    stringByAppendingPathComponent:@"Documents"];

    NSString *filePath = [documentsDirectory
                          stringByAppendingPathComponent:@"text"];


    //NSString *filePath = [[NSBundle mainBundle] pathForResource:@"text" ofType:@"txt"];

    NSString *printString = [NSString stringWithFormat:@"The new text"];

    [printString writeToFile:filePath atomically:NO encoding:NSUTF8StringEncoding error:nil];

    if (filePath) {
        NSString *stringFromFile = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
        [TextView setText:stringFromFile];
    }
}

有人可以帮助我吗? 提前致谢！ :)

Can any one please help me out? Thanks in advance! :)

推荐答案

您可以使用以下功能:

-(void) writeToTextFile
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains
        (NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *fileName = [NSString stringWithFormat:@"%@/textfile.txt", 
                                                  documentsDirectory];
    NSString *content = @"Your Desired Content";
    [content writeToFile:fileName 
                     atomically:NO 
                           encoding:NSStringEncodingConversionAllowLossy 
                                  error:nil];

}

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