Question

我在iPhone中使用以下代码将字符串写入存储在我的iPhone项目资源文件夹中的文件中。当我尝试读取它成功读取数据但当我尝试写它不写文件虽然它的aloso没有给我任何错误。

这是我的代码：

NSString *myString; //Assuume the string you want to write is this
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,     NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"myfile.txt"];
[myString writeToFile:path atomically:YES];

请任何人指导。

Answer 1

- (void) testStringReadWrite {
    NSString *myString = @"abcd efgh"; 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"myfile.txt"];
    CFShow(path);
    NSError *error = nil;

    [myString writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:&error];
    if (error) {
        NSLog(@"%@",error);
    }


    NSString *readString = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&error];
    if (error) {
        NSLog(@"%@", error);
    } else {
        CFShow(readString);
    }

}

Answer 2

writeToFile：atomically：已在iOS 2.0中被删除。使用writeToFile：atomically：encoding：error：相反。您应该检查字符串的内容，例如通过NSLog（）函数。不恰当的初始化可能导致失败。

NSLog(@"%@", myString);
[myString writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:NULL];

Answer 3

仅仅是我的两分钱，来自OS X，我习惯于拨打writeToURL()而不是writeToFile()。事实证明，writeToFile()是适用于iOS的。

字符串没有写入文件 - iPhone

3 个答案: