解决ios上页面抖动的issue

ios/Classes/Container/FLBFlutterViewContainer.m

@@ -233,6 +233,9 @@ static NSUInteger kInstanceCounter = 0;
 
 - (BOOL)showSnapShotVew
 {
+    // 实际运行时 screenShotView的frame与flutterview的frame不统一 导致页面抖动 在这里同步二者的frame
+    self.screenShotView.frame = [self.screenShotView.superview convertRect:FLUTTER_VIEW.frame toView:FLUTTER_VIEW.superview];
+
     self.screenShotView.image = [self getSavedScreenShot];
    
     if([self isFlutterViewAttatched]){