问题描述
采取-->它起到什么作用(Flutter和Dart)
class Ticker {
Stream<int> tick({int ticks}) => Stream.periodic(Duration(seconds: 1),(x) {
return ticks - x - 1;
}).take(ticks);
}
解决方法
很简单,它只是将项目作为您从流中传递(ticks 参数)的计数。
// This stream is responsible to do a task for each second
Stream.periodic(Duration(seconds: 1),(x) {
return ticks - x - 1;
})
// With take,stream does it's job only `ticks` times
Stream.periodic(Duration(seconds: 1),(x) {
return ticks - x - 1;
}).take(ticks);