为什么 flutter building 多次？

Question

code screenshot1

当我热重启应用程序时 flutter building 3 次

这是输出结果

Syncing files to device Android SDK built for x86...
Restarted application in 1,018ms.
I/flutter ( 4736): Built Count: 1
I/flutter ( 4736): Built Count: 2
I/flutter ( 4736): writing...
I/flutter ( 4736): writing...
I/flutter ( 4736): reading...:
I/flutter ( 4736): reading...:
I/flutter ( 4736): Built Count: 3
I/flutter ( 4736): writing...
I/flutter ( 4736): reading...:

Answer 1

小部件的构造函数可以根据声明的位置被多次调用。只要你有 const 构造函数并且传递的值保持不变，build 方法就不会在每次初始化时被多次触发。

为什么 flutter building 多次？

Why flutter building many times?

dart

flutter