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這篇文章主要講解了“Android Flutter怎么實現仿閑魚動畫效果”,文中的講解內容簡單清晰,易于學習與理解,下面請大家跟著小編的思路慢慢深入,一起來研究和學習“Android Flutter怎么實現仿閑魚動畫效果”吧!
底部返回按鈕動畫其實就是個旋轉動畫,利用Transform.rotate
設置angle
的值即可,這里使用了GetX來對angle進行動態控制。
//返回鍵旋轉角度,初始旋轉45度,使其初始樣式為 + var angle = (pi / 4).obs; ///關閉按鈕旋轉動畫控制器 late final AnimationController closeController; late final Animation<double> closeAnimation; ///返回鍵旋轉動畫 closeController = AnimationController( duration: const Duration(milliseconds: 300), vsync: provider, ); ///返回鍵旋轉動畫 closeController = AnimationController( duration: const Duration(milliseconds: 300), vsync: provider, ); ///頁面渲染完才開始執行,不然第一次打開不會啟動動畫 WidgetsBinding.instance.addPostFrameCallback((duration) { closeAnimation = Tween(begin: pi / 4, end: pi / 2).animate(closeController) ..addListener(() { angle.value = closeAnimation.value; }); closeController.forward(); }); ///關閉按鈕點擊事件 void close() { ///反轉動畫,并關閉頁面 Future.delayed( const Duration(milliseconds: 120), () { Get.back(); }); closeController.reverse(); } IconButton( onPressed: null, alignment: Alignment.center, icon: Transform.rotate( angle: controller.angle.value, child: SvgPicture.asset( "assets/user/ic-train-car-close.svg", width: 18, height: 18, color: Colors.black, ), ))
四個欄目其實就是個平移動畫,只不過閑魚是四個欄目一起平移,而我選擇了變速平移,這樣視覺效果上會好一點。
//透明度變化 List<AnimationController> opacityControllerList = []; //上移動畫,由于每個欄目的移動速度不一樣,需要用List保存四個AnimationController, //如果想像閑魚那種整體上移,則只用一個AnimationController即可。 List<AnimationController> offsetControllerList = []; List<Animation<Offset>> offsetAnimationList = []; //之所以用addIf,是因為項目中這幾個欄目的顯示是動態顯示的,這里就直接寫成true Column( children: [] ..addIf( true, buildItem('assets/user/ic-train-nomal-car.webp',"學車加練","自主預約,快速拿證")) ..addIf( true, buildItem('assets/user/ic-train-fuuxn-car.webp',"有證復訓","優質陪練,輕松駕車")) ..addIf( true, buildItem('assets/user/ic-train-jiaxun-car.webp',"模擬加訓","考前加訓,臨考不懼")) ..addIf( true, buildItem('assets/user/ic-train-jiakao-car.webp',"駕考報名","快捷報名無門檻")) ..add(playWidget()) ..addAll([ 17.space, ]), ) //僅僅是為了在offsetController全部初始化完后執行play() Widget playWidget() { //執行動畫 play(); return Container(); } int i = 0; Widget buildItem(String img,String tab,String slogan) { //由于底部欄目是動態顯示的,需要在創建Widget時一同創建offsetController和offsetAnimation i++; AnimationController offsetController = AnimationController( duration: Duration(milliseconds: 100 + i * 20), vsync: this, ); Animation<Offset> offsetAnimation = Tween<Offset>( begin: const Offset(0, 2.5), end: const Offset(0, 0), ).animate(CurvedAnimation( parent: offsetController, // curve: Curves.easeInOutSine, curve: const Cubic(0.12, 0.28, 0.48, 1), )); AnimationController opacityController = AnimationController( duration: const Duration(milliseconds: 500), lowerBound: 0.2, upperBound: 1.0, vsync: this); opacityControllerList.add(opacityController); offsetControllerList.add(offsetController); offsetAnimationList.add(offsetAnimation); return SlideTransition( position: offsetAnimation, child: FadeTransition( opacity: opacityController, child: Container( margin: EdgeInsets.only(bottom: 16), height: 62, decoration: BoxDecoration( borderRadius: BorderRadius.all(Radius.circular(12)), color: const Color(0xfffafafa)), child: Row(mainAxisAlignment: MainAxisAlignment.center, children: [ 24.space, Image.asset(img, width: 44, height: 44), 12.space, Column( crossAxisAlignment: CrossAxisAlignment.start, mainAxisSize: MainAxisSize.min, children: [ Text(tab, style: const TextStyle( color: Color(0XFF000000), fontSize: 16, fontWeight: FontWeight.bold)), Text(slogan, style: const TextStyle( color: Color(0XFF6e6e6e), fontSize: 12)), ]).expanded, Image.asset("assets/user/ic-train-arrow.webp", width: 44, height: 44), 17.space ])).inkWell( onTap: () {}, delayMilliseconds: 50)), ); } //執行動畫 void play() async { for (int i = 0; i < offsetControllerList.length; i++) { opacityControllerList[i].forward(); ///欄目正序依次延遲(40 + 2 * i) * i的時間,曲線速率 Future.delayed(Duration(milliseconds: (40 + 2 * i) * i), () { offsetControllerList[i] .forward() .whenComplete(() => offsetControllerList[i].stop()); }); } } ///關閉按鈕點擊事件 void close() { ///反轉動畫,并關閉頁面 Future.delayed( const Duration(milliseconds: 120), () { Get.back(); }); for (int i = offsetControllerList.length - 1; i >= 0; i--) { ///欄目倒敘依次延遲(40 + 2 * (offsetControllerList.length-1-i)) * (offsetControllerList.length-1-i))的時間 Future.delayed( Duration( milliseconds: (40 + 2 * (offsetControllerList.length-1-i)) * (offsetControllerList.length-1-i)), () { offsetControllerList[i].reverse(); }); } opacityTopController.reverse(); }
漸變動畫使用FadeTransition
即可。
///圖片透明度漸變動畫控制器 late final AnimationController imgController; ///圖片透明度漸變動畫 imgController = AnimationController( duration: const Duration(milliseconds: 500), lowerBound: 0.0, upperBound: 1.0, vsync: provider); imgController.forward().whenComplete(() => imgController.stop()); ///漸變過渡 FadeTransition( opacity: imgController, child: Image.asset("assets/user/ic-traincar-guide.webp"), ), ///關閉按鈕點擊事件 void close() { imgController.reverse(); }
///頂部標題下移動畫控制器 late final AnimationController offsetTopController; late final Animation<Offset> offsetTopAnimation; ///頂部標題漸變動畫控制器 late final AnimationController opacityTopController; ///頂部標題上移動畫 offsetTopController = AnimationController( duration: const Duration(milliseconds: 300), vsync: provider, ); offsetTopController .forward() .whenComplete(() => offsetTopController.stop()); offsetTopAnimation = Tween<Offset>( begin: const Offset(0, -0.8), end: const Offset(0, 0), ).animate(CurvedAnimation( parent: offsetTopController, curve: Curves.easeInOutCubic, )); offsetTopController .forward() .whenComplete(() => offsetTopController.stop()); //UI SlideTransition( position: offsetTopAnimation, child: FadeTransition( opacity: opacityTopController, child: Column( crossAxisAlignment: CrossAxisAlignment.start, mainAxisAlignment: MainAxisAlignment.start, mainAxisSize: MainAxisSize.min, children: [ 80.space, const Text( '練車指南', style: TextStyle( color: Color(0XFF141414), fontSize: 32, fontWeight: FontWeight.w800, ), ), 2.space, const Text('易練只為您提供優質教練,為您的安全保駕護航', style: TextStyle( color: Color(0XFF141414), fontSize: 15)), ], ))), ///關閉按鈕點擊事件 void close() { offsetTopController.reverse(); opacityTopController.reverse(); }
最后,在關閉頁面的時候不要忘記注銷動畫。
///關閉時注銷動畫 void dispose() { for (int i = offsetControllerList.length - 1; i > 0; i--) { offsetControllerList[i].dispose(); } offsetTopController.dispose(); opacityTopController.dispose(); imgController.dispose(); closeController.dispose(); }
感謝各位的閱讀,以上就是“Android Flutter怎么實現仿閑魚動畫效果”的內容了,經過本文的學習后,相信大家對Android Flutter怎么實現仿閑魚動畫效果這一問題有了更深刻的體會,具體使用情況還需要大家實踐驗證。這里是億速云,小編將為大家推送更多相關知識點的文章,歡迎關注!
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