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];
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原文：http://blog.csdn.net/lu_ca/article/details/47168729