Modern development is highly asynchronous: isn’t it about time iOS developers had tools that made programming asynchronously powerful, easy and delightful?
[CLLocationManager promise].catch(^{
return self.chicagoLocation;
}).then(^(CLLocation *loc){
return [NSURLConnection GET:@"http://user.net/%f/%f", loc.latitude, loc.longitude];
}).then(^(NSDictionary *user){
UIAlertView *alert = [UIAlertView new];
alert.title = [NSString stringWithFormat:@"Hi, %@!", user.name];
[alert addButtonWithTitle:@"Bye"];
[alert addButtonWithTitle:@"Hi!"];
return alert.promise;
}).then(^(NSNumber *tappedButtonIndex, UIAlertView *alert){
if (tappedButtonIndex.intValue == alert.cancelButtonIndex)
return nil;
id vc = [HelloViewController new]
return [self promiseViewController:vc animated:YES completion:nil].then(^(id resultFromViewController){
//…
});
}).catch(^(NSError *err){
//…
});- PromiseKit can and should be integrated into the other Pods you use.
- PromiseKit is complete, well-tested and in apps on the store.
For guides and complete documentation visit promisekit.org.
#Swift
To test the waters, PromiseKit is available as a Swift variant. If you want to use it in your app then drag and drop swift/PromiseKit.xcodeproj into your project.
Currently the Swift and Objective-C versions are indepenedent. We hope to fix that as Xcode 6 matures.
We provide a demo project for the Swift version, just open the provided xcodeproj.
Please be aware that (much like the language) the Swift version is a work in progress.
CLLocationManager.promise().catch {
// If location cannot be determined, default to Chicago
return CLLocation(latitude: 41.89, longitude: -87.63)
}.then {
let (lat, lon) = ($0.coordinate.latitude, $0.coordinate.longitude)
return NSURLConnection.GET("http://user.net/\(lat)/\(lon)")
}.then { (user:NSDictionary) in
let alert = UIAlertView()
alert.title = "Hi " + user["name"]
alert.addButtonWithTitle("Bye")
alert.addButtonWithTitle("Hi")
return alert.promise()
}.then { [unowned self] tappedButtonIndex -> Promise<Void>? in
if tappedButtonIndex == 0 {
return nil
}
let vc = HelloViewController()
return self.promiseViewController(vc).then { (modallyPresentedResult:String) -> Void in
//…
}
}.catch { error in
//…
}
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