尝试将字符串写入文件

Question

  

可能重复：   Problem in writing to a file in application bundle

我正在尝试使用以下代码将String写入文件：

NSString *file = [[NSBundle mainBundle] pathForResource:@"settings" ofType:@"txt"];

NSLog(@"Path : , %@", file);

NSError *error=NULL;

NSString *data=@"teleiwne";

[data writeToFile:file atomically:YES encoding:NSUTF8StringEncoding error:&error];

Path的打印出来是：/ Users / kd / Library / Application Support / iPhone Simulator / 6.0 / Applications / 763B8245-CB1A-4​​BDE-85CF-19AEFA411DB8 / testKremala.app / settings.txt

我没有收到任何错误，但没有写入文件

我尝试了以下代码并且它有效：

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:@"set.txt"];

NSString *data=@"Kostas";

[data writeToFile:appFile atomically:YES];

NSString *myData = [NSString stringWithContentsOfFile:appFile];

NSLog(@"Data : %@ ",myData);

Answer 1

您不能写入App目录。尝试写入该app文件夹中的Documents目录。

NSString *data = @"testData";
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:@"settings.txt"];
[data writeToFile:appFile atomically:YES];