尝试使用NSFileHandle创建和写入文件...它似乎没有工作

Question

我在这做错了什么:

NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0]; 
self.gpsFilePath = [documentsDirectory stringByAppendingString: @"/gpsReadings.txt"];
self.gpsFile = [NSFileHandle fileHandleForWritingAtPath:self.gpsFilePath];
[self.gpsFile writeData:@"GPS Readings"];
[self.gpsFile closeFile];

Answer 1

我需要先创建文件:

[[NSFileManager defaultManager] createFileAtPath:self.gpsFilePath contents:nil attributes:nil];