iOS实时搜索策略

[self.textFiled bk_addEventHandler:^(UITextField *sender) {
       [selfWeak realTimeSearch];
    } forControlEvents:UIControlEventEditingChanged];

-  (void)realTimeSearch{
    [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(searchModelByText:) object:self.searchTextFiled.textFiled];
    [self performSelector:@selector(searchModelByText:) withObject:self.searchTextFiled.textFiled afterDelay:0.6];
}
- (void)searchModelByText:(UITextField *)textfile{
    NSString *text = textfile.text;
    if ([NSString isBlankString:text]) return;
   // 自己的逻辑
}