Remove special symbols in IOS string stringbytrimmingcharactersinset

First, the previous example:

NSString * str1 =[nameinput.text Stringbytrimmingcharactersinset:[nscharactersetwhitespaceandnewlinecharacterset]] ;

NSString * str2 =[passwdinput.text Stringbytrimmingcharactersinset:[nscharactersetwhitespaceandnewlinecharacterset ]];

[Self.delegate loginactioninview:self name:str1 PASSWD:STR2];

Reprinted from: http://blog.csdn.net/aiyongyyy/article/details/8269546

You can use the Stringbytrimmingcharactersinset function in iOS to filter special symbols in a string

First define a nscharacterset, including special symbols that need to be removed.

Nscharacterset *set = [nscharacterset charactersetwithcharactersinstring: @ "@/:; () ￥" ", []{}#%-*+=_\\|~<> $€^? ' @#$%^&* () _+ ' \ "";

Because there are full-width and half-width symbols in the nsstring, some symbols include full-width and half-width

Then call Stringbytrimmingcharactersinset

NSString *trimmedstring = [string stringbytrimmingcharactersinset:set];

Trimmedstring is the filtered string.

----------------------------------------------------------

Http://blog.sina.com.cn/s/blog_5421851501014xif.html

RemoveusernameThe space in the table Newline,nextline
The code is as follows: (three lines of code)

Nscharacterset *whitespace = [NscharactersetWhitespaceandnewlinecharacterset];

NSString *username= [Musernamefield stringvalue];

Username = [usernameStringbytrimmingcharactersinset: whitespace];



Notes：

Stringbytrimmingcharactersinset:
Returns a new string made by removing from both ends of the receiver characters contained in a given character set.

Whitespaceandnewlinecharacterset
Returns a character set containing only the whitespace characters space (u+0020) and tab (u+0009) and the newline and next Line characters (u+000a–u+000d, u+0085).

Alternatively, you can useWhitespacecharactersetReplaceWhitespaceandnewlinecharactersetDifference newline nextline
Whitespacecharacterset
Returns a character set containing only the in-line whitespace characters space (u+0020) and tab (U+0009).

NSString *temptext = [messageTextField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
NSString *text = [temptext stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet ]];

Use the Stringbytrimmingrightcharactersinset method to remove the rightmost space of a string.

C code

1. NSLog (@ "%@", [@ "ABC 123" Stringbytrimmingrightcharactersinset:[nscharacterset Whitespacecharacterset]]);

How do I get rid of a string @ "0.012300" at the far right of "0"? This is the typical float format into a string after the form, it is best to remove the rightmost "0".

Here's how to fix it:

C code

1. [@ "0.012300" Stringbytrimmingrightcharactersinset:[nscharacterset charactersetwithcharactersinstring:@ "0"];

Remove special symbols in IOS string stringbytrimmingcharactersinset