1，document 中的路径 最麻烦的一种：
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:filename；
本人自写自用的宏
2，
#define ABS_FILE_PATH(FILE_NAME) [NSString stringWithFormat:@"%@/Documents/%@", NSHomeDirectory(),FILE_NAME]
3，获取程序application package目录下的文件路径：
#define PACKAGE_FILE_PATH(FILE_NAME) [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:FILE_NAME]
4，
NSString* filePath = [[NSBundle mainBundle] pathForResource:@"fileName" ofType:@"fileType(txt...html..)"];
