小结：
1）componentsSeparatedByString:截取指定字符串；
2) pathForResource：获取程序运行时目录
3) objectAtIndex:获取当前索引的字符串；
4) rangeOfString:获取指定短字符串在长字符串中的开始，结尾索引值；
5) stringWithContentsOfFile：按行读取文件
6) componentsSeparatedByString:@"\n"];换行分割字符串；
7) NSEnumerator *nse = [lines objectEnumerator]; 将数组转换为NSEnumerator，可向前读取数据；
8) nextObject：读取下一行数据；
void splitString(){
NSString *animals = @"dog#cat#pig";
//将#分隔的字符串转换成数组
NSArray *array = [animals componentsSeparatedByString:@"#"];
NSLog(@"animals:%@",array);
//获取程序运行时目录
NSString *escapedPath = [[NSBundle mainBundle] pathForResource:@"info" ofType:@"plist"];
NSArray *strings = [escapedPath componentsSeparatedByString: @"/"];
NSString *tmpFilename = [strings objectAtIndex:[strings count]-1];
NSRange iStart = [escapedPath rangeOfString : tmpFilename];
NSString *runtimeDirectory = [escapedPath substringToIndex:iStart.location-1];
NSLog(@"runtimeDirectory:%@",runtimeDirectory);
//按行读取文件
NSString *tmp;
NSArray *lines = [[NSString stringWithContentsOfFile:@"test.txt" encoding:nil error:nil]
componentsSeparatedByString:@"\n"];
NSEnumerator *nse = [lines objectEnumerator];
while(tmp = [nse nextObject]) {
NSLog(@"tmp:%@", tmp);
}
}