iOS中文本文件內容追加

最近要在模擬器環境下收集一些數據日志。

然後考慮到數據記載和追加功能。

簡單代碼如下

1. +(void) appString:(NSString *) s
2. {
4. BOOL isExit = [NLCommonUtil isExitOfFile:@"nonotextiphone"];
5. NSString *filePath = [self FilePathInDocumentByFileName:@"nonotextiphone"];
7. if (!isExit) {
9. NSLog(@"%@",@"文件不存在");
10. NSString *s = [NSString stringWithFormat:@"開始了:\r"];
11. [s writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:nil];
13. }
15. NSFileHandle *outFile;
16. NSData *buffer;
18. outFile = [NSFileHandle fileHandleForWritingAtPath:filePath];
20. if(outFile == nil)
21. {
22. NSLog(@"Open of file for writing failed");
23. }
25. //找到並定位到outFile的末尾位置(在此後追加文件)
26. [outFile seekToEndOfFile];
28. //讀取inFile並且將其內容寫到outFile中
29. NSString *bs = [NSString stringWithFormat:@"%@",s];
30. buffer = [bs dataUsingEncoding:NSUTF8StringEncoding];
32. [outFile writeData:buffer];
34. //關閉讀寫文件
35. [outFile closeFile];
37. }