UISearchbar设置placeholder字体颜色大小

UITextField *textfield = [searchbarvalueForKey:@"_searchField"];

  [textfieldsetValue:color(0x999999, 1.0f)forKeyPath:@"_placeholderLabel.textColor"];

  [textfield setValue:[UIFontboldSystemFontOfSize:12]forKeyPath:@"_placeholderLabel.font"];

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