leastLoadingTime property
leastLoadingTime: If this param is set to 1 second, dismiss() is called immediately after showLoading(), loading will not be closed immediately, but will be closed when the loading time reaches 1 second
最小加载时间: 如果该参数设置为1秒, showLoading()之后立马调用dismiss(), loading不会立马关闭, 会在加载时间达到1秒的时候关闭
Implementation
final Duration leastLoadingTime;