ios 读取项目下的文件

    NSString *mainBundleDirectory=[[NSBundle mainBundle] bundlePath];

    NSString *path=[mainBundleDirectory stringByAppendingPathComponent:@"123.txt"];

    NSURL *url=[NSURL fileURLWithPath:path];

    NSData *data = [[NSData alloc] initWithContentsOfURL:url];

    NSString* aStr=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];