ios - 启用/禁用时从TextColor之类的按钮更改BorderColor

Question

如果我的TextField为空，则应禁用该按钮，并且该按钮的textColor和borderColor应该为灰色。但是，启用按钮后，颜色应为蓝色。

更改textColor很容易:

button.SetTitleColor(UIColor.Black, UIControlState.Normal);
button.SetTitleColor (UIColor.Gray, UIControlState.Disabled);

但是如何更改边框的颜色？

Answer 1

在您的ViewDidLoad ()的ViewController方法中:

MyButton.SetTitleColor(UIColor.Black, UIControlState.Normal);
MyButton.SetTitleColor (UIColor.Gray, UIControlState.Disabled);
MyButton.Layer.BorderWidth = 2;
MyButton.Layer.CornerRadius = 2;
UpdateButton();
MyEntryField.AllEditingEvents += (object sender, EventArgs e) => {
    UpdateButton();
};

更新方法:

public void UpdateButton() {
    if (MyEntryField.HasText) {
        MyButton.Enabled = false;
        MyButton.Layer.BorderColor = UIColor.Blue.CGColor;
    } else {
        MyButton.Enabled = true;
        MyButton.Layer.BorderColor = UIColor.DarkGray.CGColor;
    }
}

禁用:



已启用: