Flutter跳转iOS原生页面后的穿透问题

在插件开发过程中发现flutter页面通过present跳转原生页面后，原生页面上的点击响应下面的Flutter页面中的点击事件。这个问题出现很早了，github中有人提了issue但是一直没有修复。

解决方案：

1.重写从FlutterViewController呈现的UIViewController的4个方法

这可以防止将未处理的事件传播到 FlutterViewController

Swift

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
}

override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
}

Objective-C

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
}

-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
}

-(void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
}

-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
}

2. 停止从 FlutterViewController 做 Present

页面跳转时切换window的根控制器到原生控制器即可，在返回时再切换回flutter中。