diff --git a/lib/pen.js b/lib/pen.js
index 4bfed02..47f8c1f 100644
--- a/lib/pen.js
+++ b/lib/pen.js
@@ -547,7 +547,7 @@ export default class Painter {
       }
       let lineIndex = 0;
       for (let j = 0; j < textArray.length; ++j) {
-        const preLineLength = Math.floor(textArray[j].length / linesArray[j]);
+        const preLineLength = Math.ceil(textArray[j].length / linesArray[j]);
         let start = 0;
         let alreadyCount = 0;
         for (let i = 0; i < linesArray[j]; ++i) {
diff --git a/painter.js b/painter.js
index e24902c..3a73580 100644
--- a/painter.js
+++ b/painter.js
@@ -630,7 +630,9 @@ Component({
         this.bottomContext || (this.bottomContext = wx.createCanvasContext('bottom', this));
         this.topContext || (this.topContext = wx.createCanvasContext('top', this));
         this.globalContext || (this.globalContext = wx.createCanvasContext('k-canvas', this));
-        new Pen(this.bottomContext, palette).paint();
+        new Pen(this.bottomContext, palette).paint(() => {
+          this.triggerEvent('didShow');
+        });
         new Pen(this.globalContext, {
           width,
           height,