如何在iOS的本地資源txt文件中附加字符串sdk

Question

我一直在試圖將字符串附加到本地資源文件，但我無法找到解決方案。我試圖爲我的應用程序中的所有函數調用創建一個日誌文件，所以如果它崩潰，我可以看到它停止的功能。

我已創建一個log.rtf文件，但無法寫入此文件。有人可以幫助我追加一個字符串到這個文件，而不必覆蓋整個事情？

Answer 1

我對以上問題使用以下代碼。

NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDir = [documentPaths objectAtIndex:0]; 
NSString *logPath = [[NSString alloc] initWithFormat:@"%@",[documentsDir stringByAppendingPathComponent:@"log.rtf"]]; 
NSFileHandle *fileHandler = [NSFileHandle fileHandleForUpdatingAtPath:logPath]; 
[fileHandler seekToEndOfFile]; 
[fileHandler writeData:[text dataUsingEncoding:NSUTF8StringEncoding]]; 
[fileHandler closeFile]; 

Answer 2

- (void)log:(NSString *)message { 
    NSMutableString *string = [[NSMutableString alloc] initWithContentsOfFile:[NSString stringWithFormat:@"%@/log.txt", [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]]]; 
    if (!string) string = [[NSMutableString alloc] init]; 
    [string appendFormat:@"%@\r\n", message]; 
    [string writeToFile:[NSString stringWithFormat:@"%@/log.txt", [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] atomically:YES encoding:NSUTF8StringEncoding error:nil]; 
} 

Answer 3

這樣你就可以做到這一點..

+ (void)WriteLogWithString:(NSString *)log 
{ 

     if(log != nil){ 

      NSString *locationFilePath = [self getLogFilePath];//access the path of file 

      FILE *fp = fopen([locationFilePath UTF8String], "a"); 

      fprintf(fp,"%s\n", [log UTF8String]); 

      fclose(fp); 
     } 

}