梯度TextField ActionScript 3

Question

在过去的几个小时里，我一直在寻找一种在TextField组件上添加渐变颜色的方法，而没有运气。一种方法是创建一个梯度矩形，并将TextField设置为它的掩码，但我无法使它工作：

var m:MovieClip = new MovieClip();
var mTxt:Sprite = new Sprite();
var txt:TextField = new TextField();
var tf:TextFormat = new TextFormat();
var dropShadow:DropShadowFilter = new DropShadowFilter(); 

dropShadow.distance = 0;
dropShadow.angle = 120;
dropShadow.color = 0x000000;
dropShadow.alpha = 1;
dropShadow.blurX = 2;
dropShadow.blurY = 2;
dropShadow.strength = 1;
dropShadow.quality = 80;
dropShadow.inner = false;
dropShadow.knockout = false;
dropShadow.hideObject = false;
txt.filters = new Array(dropShadow); 


tf.font = "Ethnocentric Rg";
tf.color = 0xffde00;
tf.size = 72;
txt.defaultTextFormat = tf;
txt.text = "1756.25";
mTxt.addChild(txt);

var fillType:String = GradientType.LINEAR;
var colors:Array = [0xFF0000, 0x0000FF];
var alphas:Array = [1, 1];
var ratios:Array = [0x00, 0xFF];
var matr:Matrix = new Matrix();

matr.createGradientBox(400, 100, 0, 0, 0);

var spreadMethod:String = SpreadMethod.REFLECT;


m.graphics.beginGradientFill(fillType, colors, alphas, ratios, matr, spreadMethod);  
m.graphics.drawRect(0,0,400,120);

m.mask = mTxt;

addChild( m );

这段代码实际上使AIR调试器崩溃并退出。我在这里做错什么了？

Answer 1

我必须将两个层的cacheAsBitmap选项设置为true：

txt.cacheAsBitmap = true;
m.cacheAsBitmap = true;
addChild( m );
addChild(txt);
m.mask = txt;

Answer 2

将cacheAsBitmap设置为true，并确保将面具添加到舞台上。

m.cacheAsBitmap = mTxt.cacheAsBitmap = true;
m.mask = mTxt;
addChild( m );
addChild( mTxt );