[_panel setShouldChangeCharactersInRange:^(UITextField *textField,NSRange range,NSString *string){
NSString *topic = [textField.text stringByReplacingCharactersInRange:range withString:string];
if([topic length] < [textField.text length]) {
return YES;
}
if (topic.length > kMaxTopicLength) {
return NO;
}
return YES;
}];
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