IOS NSString比较，截取,NSLog,NSRang,isEqualToString,stringWithFormat

小结： 

1）rangeOfString:截取指定字符串的长度；

2） substringToIndex:7：截取从0 索引到指定索引（7）长度的字符串

3） substringFromIndex:9：截取从指定索引（9）到末尾长度的字符串

4） NSRange range = NSMakeRange(0,7);截取从指定索引（0）到指定（7）长度的字符串

5） substringWithRange:range：截取从指定索引（0）到指定（7）长度的字符串

6 )isEqualToString:@"p://www"：比较字符串包含关系，区分大小写

7) stringWithFormat:格式化字符串。

 

void findSubString(){

NSString *filename = @"config.ini";

NSString *escapedPath = @"/Users/config.ini";

//在escapedPath中查找filename

//NSRange iStart = [escapedPath rangeOfString :filename];

NSRange iStart = [escapedPath rangeOfString: filename options:NSCaseInsensitiveSearch];

   // NSLog(@"iStart length is %@:",iStart.length);

   // NSLog(@"iStart location is %@:",iStart.location);

if (iStart.length > 0){

//获取从escapedPath开始位置到iStart.location-1长度的子字符串

NSString *subStr = [escapedPath  substringToIndex:iStart.location-1]; 

NSLog(@"subStr:%@",subStr);

    //获取从escapedPath从iStart.location+1开始到末尾的子字符串

    NSString *extension  = [escapedPath  substringFromIndex:iStart.location]; 

    NSLog(@"extension:%@",extension);    

NSString *url = @"http://www.sevenuc.com";

NSRange range = NSMakeRange(3,7);

NSString* prefix = [url substringWithRange:range];

        NSLog(@"prefix is:%@",prefix);

        if([prefix isEqualToString:@"p://www"])

        {

            NSLog(@"prefix is equal %@",prefix);

        }

        else {      

            NSLog(@"prefix is not equal %@",prefix);

        }

//获取url从0开始共7个字符的子字符串 

if ( [prefix isEqualToString:@"http://"] )

NSLog(@"http prefix found");

}

}

 

void formatString(){

    int documentId=100;

    NSString *documentFileName=@"test.doc";

    NSString *requestSring=[NSString stringWithFormat:@"<files><fileid>%d</fileid><filename>%@</filename></files>",documentId,documentFileName];

    

    NSLog(@"requestString:%@",requestSring);

}