ios 常用


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";

//#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 mainBundlepathForResource:@"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);

}


}


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