去掉通讯录中的特殊字符

```

- (NSString*)RemoveSpecialCharacters:(NSString*)str{

    NSString*string = str;

    string = [stringstringByReplacingOccurrencesOfString:@"+86" withString:@""];

    NSCharacterSet *setToRemove = [[ NSCharacterSet characterSetWithCharactersInString:@"0123456789"]invertedSet];

    string = [[stringcomponentsSeparatedByCharactersInSet:setToRemove]componentsJoinedByString:@""];

    returnstring;

}

```