http://www.cnblogs.com/csj007523/archive/2012/07/15/2592188.html
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]; //往后久在加上搜索字符串的长度
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);
}