Small white Learning Development (IOS) OC_ string Acquisition (2015-08-11)

//

Main.m

// string acquisition

//

Created by admin on 15/8/13.

Copyright (c) years admin. All rights reserved.

//

#import <Foundation/Foundation.h>

/*

1. get the string length

2. get a single character based on a string index // the index here is subscript

3. obtain a string based on the index

4. sub-string to get the substring in the index position in a string

5. depending on the string. Get the range of a string

*/

int Main (int argc,const Char * argv[]) {

@autoreleasepool {

1. Get string length

nsstring *str1 = @ "www.baidu.com";

nsuinteger length = [str1 length]; //Nsuiteger represents an unsigned integer type

NSLog (@ "length =%lu", length);

/ * 2. To get a single character in a string by index

Note:

> The given index value must be between 0 and the length. No group causes an exception Range or index out of bounds

> Assume that the index value is negative. Then the obtained value is a negative number.

*/

Unichar c = [str1 characteratindex:0];

NSLog (@ " the string obtained is:%c", c);

//3. Get a substring of a string based on the index value

// start with the index. Contains the string following the index fetch

nsstring *tmpstr2 = [str1 substringfromindex:3];

// from the beginning of the string to the index position, not including the index

nsstring *tmpstr3 = [str1 substringtoindex:5];

//Nsrange is a struct, takes the range of a string, the first parameter starts from which index value, and the second parameter indicates how long it takes

Nsrange s = {6,3};

nsstring *TMPSTR4 = [str1 substringwithrange: s];

NSLog (@ "TMPSTR2 =%@", TMPSTR2);

NSLog (@ "TMPSTR3 =%@", TMPSTR3);

NSLog (@ "TMPSTR4 =%@", TMPSTR4);

//4. Gets the index position of the substring in another string

nsstring *TMPSTR5 = @ "Bai";

// find substrings in a string. and the index starting position location and length are deposited into the structure

nsrange tmprange = [str1 rangeofstring: TMPSTR5];

//  Print separately

NSLog (@ "location =%lu, length =%lu", Tmprange. location, Tmprange. length);

// ability to convert a Range struct to a string using Nsstringfromrange

nsstring *tmpstr6 = nsstringfromrange(tmprange);

NSLog (@ "TMPSTR6 =%@", TMPSTR6);

// infer if found

if (tmprange. Location == Nsnotfound {//enum {nsnotfound = Nsintegermax};

NSLog(@ "TMPSTR5 not in str1");

}Else

{

NSLog (@ "rangeofstring%@", TMPSTR6);

}

//5. Get sub-string index range

// The first parameter is a substring, the second is the method of selecting the search

nsrange tmpRange2 = [str1rangeofstring:@ "com"options:/ C9>nscaseinsensitivesearch];

nsrange tmpRange3 = [str1 rangeofstring:@ "com"];

NSLog (@ "tmpRange2 =%@",nsstringfromrange(tmpRange2));

NSLog (@ "tmpRange3 =%@",nsstringfromrange(tmpRange3));

}

return 0;

}

Small white Learning Development (IOS) OC_ string Acquisition (2015-08-11)