我想为外部文件写一些值,并为此目的使用NSDictionary:
NSString *s = @"123456";
NSString *key = @"key";
NSString *file = pathInAppDirectory(@"values");
NSDictionary *dic = [NSDictionary dictionaryWithObject:s forKey:key];
[dic writeToFile:file atomically:YES];
好的,pathInAppDirectory如下所示:
NSString *pathInAppDirectory(NSString *fileName)
{
NSArray *documentDirectories = NSSearchPathForDirectoriesInDomains(NSApplicationDirectory, NSUserDomainMask, YES);
NSString *appDir = [documentDirectories objectAtIndex:0];
return [appDir stringByAppendingPathComponent:fileName];
}
什么都没有发生:如果我想在稍后查看文件并想要显示值,则返回null。看一下iPhone模拟器的文件夹也会显示一个空文件夹。那里发生了什么,或者更具体地说:什么不发生?
答案 0 :(得分:0)
您需要使用NSDocumentDirectory
代替NSApplicationDirectory
。无法在Application bundle中编写。
清理示例:
- (NSString *)pathInAppDirectory:(NSString *)fileName {
NSArray *documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *appDir = [documentDirectories objectAtIndex:0];
return [appDir stringByAppendingPathComponent:fileName];
}
NSString *s = @"123456";
NSString *key = @"key";
NSDictionary *dic = [NSDictionary dictionaryWithObject:s forKey:key];
NSString *filePath = [self pathInAppDirectory:@"values"];
[dic writeToFile:filePath atomically:YES];