Some operations on NSString strings

When using strings, some strings we need to delete or replace some of the characters we don't need, then we use the Stringbyreplacingoccurrencesofstring method:

    @" @moxue " ;     *first = [str stringbyreplacingoccurrencesofstring:@"@ " withstring:@ "h "]; // Replace @ with H    NSString *second = [str stringbyreplacingoccurrencesofstring:@ "@" withstring:  @""]; // Remove String @

Another way: By customizing a nscharacterset that contains the characters to be removed:

@" moxue#moxue*moxue    moxue$$$";     *Set = [Nscharacterset charactersetwithcharactersinstring:@ "]; // set the characters    that need to be removed STR2 = [str2 stringbytrimmingcharactersinset:set]; // invoking methods for filtering    NSLog (@ "%@", str2);

In addition Nscharacterset has some of his own methods:

// Remove both spaces [str2 Stringbytrimmingcharactersinset:[nscharacterset Whitespacecharacterset]; // Remove Carriage return

String cutting is an array:

@" mo Xue, Wang Shu, burning day, Meteor "  *namearr = [name componentsseparatedbystring:@ ","];

Convert the above array to a string, with "," as the split point:

NSString *name2 = [Namearr componentsjoinedbystring:@ ","];

Some operations on NSString strings