改变UITextField PlaceHolder的字体和颜色 不影响正常输入

话不多说上代码,主要是KVC

labName.text = @"银行卡号";

textField.placeholder = @"本人的储蓄卡或者借记卡卡号";

[textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];

[textField setValue:[UIFont boldSystemFontOfSize:12] forKeyPath:@"_placeholderLabel.font"];