Objective-C使用字符串创建文本文件

Question

我正在尝试使用字符串的内容创建一个文本文件到我的桌面.我不确定我是否做得对,我没有得到错误,但它也不起作用......

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDesktopDirectory, NSUserDomainMask, YES);
NSString *desktopDirectory=[paths objectAtIndex:0];
NSString *filename = [desktopDirectory stringByAppendingString: @"file.txt"];
[myString writeToFile:filename atomically:YES encoding: NSUTF8StringEncoding error: NULL];

Answer 1

//Method writes a string to a text file
-(void) writeToTextFile{
    //get the documents directory:
    NSArray *paths = NSSearchPathForDirectoriesInDomains
        (NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];

    //make a file name to write the data to using the documents directory:
    NSString *fileName = [NSString stringWithFormat:@"%@/textfile.txt", 
                                                  documentsDirectory];
    //create content - four lines of text
    NSString *content = @"One\nTwo\nThree\nFour\nFive";
    //save content to the documents directory
    [content writeToFile:fileName 
                     atomically:NO 
                           encoding:NSStringEncodingConversionAllowLossy 
                                  error:nil];

}

Answer 2

您不知道是否收到任何错误,因为您忽略了-writeToFile:...方法返回的YES/NO值,并且没有给它记录任何可能的失败的错误指针.如果方法返回NO,则检查(并处理或出现)错误以查看错误.

猜测,失败是由于你构建的路径.尝试-stringByAppendingPathComponent:而不是-stringByAppendingString:...这及其相关方法正确处理路径.

该文件可能是实际被创建(比如,你可能不会毕竟得到任何错误).我的猜测是文件是在"〜/ Desktopfile.txt"之类的地方创建的,因为你使用-stringByAppendingString:不会将字符串视为斜杠分隔的路径.检查你的主文件夹 - 我打赌文件在那里.