NSString Snippets

// replace chars
validDeviceToken = [validDeviceToken stringByReplacingOccurrencesOfString:@"<" withString:@""];

Cut whitespaces from string
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[myString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];


Extensions for Categories
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Create MD5 Hash
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1. import <CommonCrypto/CommonDigest.h>
2. insert message

+ (NSString*)md5HexDigest:(NSString*)input{
    const char* str = [input UTF8String];
    unsigned char result[30];
    CC_MD5(str, strlen(str), result);
    
    NSMutableString *ret = [NSMutableString stringWithCapacity:30*2];
    for(int i = 0; i <30; i++) {
        [ret appendFormat:@"%02x",result[i]];
    }
    return ret;
}