UITextField PlaceHolder变色单片

Question

我一直试图改变UItextfield占位符的颜色，但我没有运气。我尝试过子类化，我尝试过修改属性化字符串，但是没有任何效果。

这是我试过的子类。

public class CustomTextbox : UITextField
{
    private string placeholder{ get;  set; }
    public CustomTextbox ()
    {
    }

    public CustomTextbox(string theString)
    {
        this.placeholder = theString;
    }

    public override void DrawPlaceholder (RectangleF rect) {
        using (UIFont font = UIFont.SystemFontOfSize (16)) 
        using (UIColor col = new UIColor (UIColor.Blue.CGColor)) { 
            col.SetFill (); col.SetStroke (); col.SetColor (); base.DrawString (base.Placeholder,rect, font); } }
            

}

这是我尝试过的属性字符串方法：

var textat = new NSMutableAttributedString ("Email", new CTStringAttributes () {

            
            ForegroundColor = UIColor.White.CGColor,StrokeColor = UIColor.White.CGColor,
            StrokeWidth = 5.0f
        });
        this.emailtextbox.AttributedPlaceholder = textat;

Answer 1

只需简化你已经拥有的。这适用于iOS7：

var t = new UITextField()
{
  AttributedPlaceholder = new NSAttributedString("some placeholder text", null, UIColor.Red)
}

Answer 2

这样做的单调方法是(答案是找到这里)

myLogin.AttributedPlaceholder = new NSAttributedString (
    "Enter your credentials",
    font: UIFont.FromName ("HoeflerText-Regular", 24.0f),
    foregroundColor: UIColor.Red,
    strokeWidth: 4 
);

Answer 3

试试这个：

[yourtextField setValue:[UIColor blueColor] forKeyPath:@"_placeholderLabel.textColor"];