iOS開發設置textField的屬性placeholder的字體顏色及大小

self.moneytextfield.placeholder = @"請輸入會員消費金額";
    [self.moneytextfield setValue:[UIColor lightGrayColor]  forKeyPath:@"_placeholderLabel.textColor"];
    [self.moneytextfield setValue:[UIFont systemFontOfSize:16.0] forKeyPath:@"_placeholderLabel.font"];