Replace a char into NSString

I want simply replace all occourrencies of "+" with a blank " " char... I tried some开发者_如何学编程 sample listed here, also used NSSMutableString, but the program crash... what's the best way to replace a char from another?? thanks

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If you want to replace with a mutable string (NSMutableString) in-place:

[theMutableString replaceOccurrencesOfString:@"+"
                                  withString:@" "
                                     options:0
                                       range:NSMakeRange(0, [theMutableString length])]

If you want to create a new immutable string (NSString):

NSString* newString = [theString stringByReplacingOccurrencesOfString:@"+"
                                                           withString:@" "];

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NSString *firstString = @"I'm a noob at Objective-C", *finalString;

finalString = [[firstString stringByReplacingOccurrencesOfString:@"O" withString:@"0"] stringByReplacingOccurrencesOfString:@"o" withString:@"0"];

Got the code from here!