ios修改placeholder字体颜色的方法

这是第一种，添加属性

  NSMutableDictionary *dict = [NSMutableDictionary dictionary];

    dict[NSForegroundColorAttributeName] = [UIColor redColor];

    NSAttributedString *string = [[NSAttributedString alloc]initWithString:@"cdcdcdcdcd" attributes:dict];

    

    UITextField *field = [[UITextField alloc]initWithFrame:CGRectMake(30,230,120, 33)];

    field.attributedPlaceholder = string;

    [self.view addSubview:field];

第二种是用KVC

    [field setValue:[UIColor greenColor] forKeyPath:@"_placeholderLabel.textColor"];

    [field setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];