How do I have a async task inside a while loop I currently have this
myGroup = DispatchGroup()
while *condition* {
myGroup.enter()
query.getDocuments { (blah, blah) in
arr.append(docs)
//...
}
myGroup.leave()
}
completion(arr)
enter code here
this doesnt not work because it just immediatly goes back up to the while loop while skipping the async .getDocuments part
You can create a Promise to handle the async part to make the function flow smoothly. When a promise is resolved, the async .getDocuments part has already done fetching the document. And then, my Group may leave with the docs fetched:
myGroup = DispatchGroup()
while *condition* {
myGroup.enter();
var promise = new Promise((resolve, reject) => {
query.getDocuments { (blah, blah) in
arr.append(docs)
//...
resolve(true);//or resolve(return-some-val-from-promise-if-you-want)
}
})
promise.then(returnedVal => {
myGroup.leave()
})
}
completion(arr)
