NSAttributedString 不适用于 UITextField ios xamarin

Question

我在更改 UITextField 中占位符的字体和字体大小时遇到​​问题。

this.emailTextField = new UITextField ();

//Not working
this.emailTextField.AttributedPlaceholder = new NSAttributedString ("Email address", UIFont.FromName("Didot-Italic", 6.0f));

this.emailTextField.KeyboardType = UIKeyboardType.EmailAddress;
this.emailTextField.ReturnKeyType = UIReturnKeyType.Next;
this.emailTextField.AdjustsFontSizeToFitWidth = true;
this.emailTextField.ClearButtonMode = UITextFieldViewMode.Always;
this.emailTextField.BackgroundColor = UIColor.White;
this.emailTextField.BorderStyle = UITextBorderStyle.None;

var bottomLayer = new CALayer ();
bottomLayer.BorderColor = UIColor.Black.CGColor;
bottomLayer.BorderWidth = 1;
bottomLayer.Frame = new RectangleF (0, 29, 200, 1);

this.emailTextField.Layer.AddSublayer (bottomLayer);
this.emailTextField.Frame = new RectangleF (60, this.fbButton.Frame.Bottom + 20, 200, 30);

Answer 1

您可以尝试如下使用。到目前为止它对我有用。

this.emailTextField.AttributedPlaceholder = new NSAttributedString ("Email address", new UIStringAttributes{Font = UIFont.FromName("Didot-Italic", 6.0f)});