How to create callback function in dart flutter?

Question

I have this method with onTap parameter

myFunc({onTap}){
   return onTap;
}

then, I need to use it like this

myFunc(
   onTap: print('lorem ipsum');
)

How I can make it correctly? thanks

Answer 1

You can do like below. Note that you can specify parameter or avoid and I have added Function(You can use ValueChange, Voidcallback)

myFunc({Function onTap}){
   onTap();
}

//invoke
myFunc(onTap: () {});

If you want to pass arguments:

myFunc({Function onTap}){
   onTap("hello");
}

//invoke
myFunc(onTap: (String text) {});