iOS數據存儲到CSV文件

-(void)saveDataToFile{

    //存儲數據

    NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentDir = [path objectAtIndex:0];

    NSString *filePath = [documentDir stringByAppendingPathComponent:@"fps.csv"];

    NSLog(@"filePath%@",filePath);

    

    if (![[NSFileManager defaultManager]fileExistsAtPath:filePath]) {

        [[NSFileManager defaultManager]createFileAtPath:filePath contents:nil attributes:nil];

    }

    

    NSMutableString *writeString = [NSMutableString stringWithCapacity:0];

    NSMutableArray *dataArray = [NSMutableArray array];

    for (int i=0; i<3; i++) {

        NSString *s1 = [NSString stringWithFormat:@"row%d",i];

        NSString *s2 = [NSString stringWithFormat:@"row%d",i];

        NSString *s3 = [NSString stringWithFormat:@"row%d",i];

        

        NSArray *rowArray = [NSArray arrayWithObjects:s1,s2,s3, nil];

        NSLog(@"rowArray%@",rowArray);

        [dataArray addObject:rowArray];

    }

    for (int j = 0; j < [dataArray count]; j++) {

        

        [writeString appendString:[NSString stringWithFormat:@"%@;%@;%@\n",

                                   [[dataArray objectAtIndex:j]objectAtIndex:0],

                                   [[dataArray objectAtIndex:j]objectAtIndex:1],

                                   [[dataArray objectAtIndex:j]objectAtIndex:2]]];

    }

    

    NSFileHandle *handle;

    handle = [NSFileHandle fileHandleForWritingAtPath:filePath];

    [handle truncateFileAtOffset:[handle seekToEndOfFile]];

    [handle writeData:[writeString dataUsingEncoding:NSUTF8StringEncoding]];

}