iOS13不再允许UITextField的placeholder属性通过 kvc 的方式更改颜色和字体等属性，替换方法为：
UITextField * searchField = self.searchTextField;
NSString *placeHolder = @"请输入关键词搜索";
NSMutableAttributedString *placeHolderStr = [[NSMutableAttributedString alloc]initWithString:placeHolder];
NSDictionary *attrDic = @{@"NSFontAttributeName":[UIFont systemFontOfSize:15],
@"NSForegroundColorAttributeName":[UIColor grayColor]};
[placeHolderStr addAttributes:attrDic} range:NSMakeRange(0, placeHolder.length)];
searchField.attributedPlaceholder = placeHolderStr;
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