设置textfield的placeholder的字体和颜色

设置textfield的placeholder的字体和颜色
UITextField *textField = [[UITextField
alloc] initWithFrame:CGRectMake(10,
30, 300,
150)];

textField.placeholder =
@"this is a textField";

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

[textField setValue:[UIFont
boldSystemFontOfSize:30]
forKeyPath:@"_placeholderLabel.font"];

textField.borderStyle =
UITextBorderStyleRoundedRect;
[self.view
addSubview:textField];