objective c - How to detect space, and special characters like :, ?,`,~, etc in text of a textfield in iPhone SDK? -

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how detect space, , special characters :, ?,`,~, etc in text of textfield in iphone sdk?

try this.. 

nscharacterset* symbols = [nscharacterset symbolcharacterset];    if([symbols characterismember: yourcharacter]) {         //check condition here     }

if want include many characters use combined nscharacterset nsmutablecharacterset..

    nsmutablecharacterset *space = [nsmutablecharacterset charactersetwithcharactersinstring:@" "];     [space formunionwithcharacterset:[nscharacterset symbolcharacterset]];

use space characterset check character


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