查找了很多的資料找到個方法，利用NSPipe即可以實現，

蘋果官方解釋：

      objects provide an object-oriented interface for accessing pipes. An NSPipe object represents both ends of a pipe and enables communication through the pipe. A pipe is a one-way communications channel between related processes; one process writes data, while the other process reads that data. The data that passes through the pipe is buffered; the size of the buffer is determined by the underlying operating system.NSPipe

   NSPipe是一個抽象類，一類叢集的公共介面。通過NSPipe 我們可以方便的讀取和寫入程序資料，

如果想實現將 程式的實時日誌列印，可以在控制器中新增下邊方法

- (void)redirectNotificationHandle:(NSNotification *)nf{ // 通知方法
    NSData *data = [[nf userInfo] objectForKey:NSFileHandleNotificationDataItem];
    NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    
    self.logTextView.text = [NSString stringWithFormat:@"%@\n\n%@",self.logTextView.text, str];// logTextView 就是要將日誌輸出的檢視（UITextView）
    NSRange range;
    range.location = [self.logTextView.text length] - 1;
    range.length = 0;
    [self.logTextView scrollRangeToVisible:range];
    [[nf object] readInBackgroundAndNotify];
}

- (void)redirectSTD:(int )fd{ 
    NSPipe * pipe = [NSPipe pipe] ;// 初始化一個NSPipe 物件
    NSFileHandle *pipeReadHandle = [pipe fileHandleForReading] ;
    dup2([[pipe fileHandleForWriting] fileDescriptor], fd) ;
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(redirectNotificationHandle:)
                                                 name:NSFileHandleReadCompletionNotification
                                               object:pipeReadHandle]; // 註冊通知
    [pipeReadHandle readInBackgroundAndNotify];
}
 

執行

 [self redirectSTD:STDOUT_FILENO];

    [self redirectSTD:STDERR_FILENO];

就可以實現輸出列印，