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UIButton *clearButton = [self.textField valueForKey:@"_clearButton"];
[clearButton setImage:[UIImage imageNamed:@"search_clear_button"] forState:UIControlStateNormal];
[iOS-UI]给输入框添加清除按钮的代码
原文地址：http://www.cnblogs.com/lz465350/p/5474736.html
