Modern development is highly asynchronous: isn’t it about time iOS developers had tools that made programming asynchronously powerful, easy and delightful?
UIActionSheet *sheet = …;
sheet.message = @"Share photo with your new local bestie?";
sheet.promise.then(^(NSNumber *dismissedButtonIndex){
if (dismissedButtonIndex.intValue == alert.cancelButtonIndex)
return;
UIImagePickerController *picker = …;
[self promiseViewController:picker animated:YES completion: nil].then(^(UIImage *img, NSData *imgData){
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
return [CLLocationManager promise].then(^(CLLocation *located){
return [NSURLConnection GET:@"share.com/token/%f/%f", located.latitude, located.longitude];
}).finally(^{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}).then(^(NSDictionary *json){
// the JSON is automatically decoded
MFMessageViewController *messagevc = …;
messagevc.to = json[@"to_email"];
messagevc.body = json[@"message_text"];
[messagevc addAttachmentData:imgData typeIdentifier:(NSString *)kUTTypeJPEG filename:@"image.jpeg"];
return [self promiseViewController:messagevc animated:YES completion:nil];
});
}).catch(^(NSError *error){
// because we returned promises in the above handler, any errors
// that may occur during execution of the chain will be caught here
[[UIAlertView:error] show];
});
});- 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 intend 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.
let sheet = UIAlertView(…)
sheet.message = "Share photo with your new local bestie?"
sheet.promise.then { dismissedButtonIndex in
if dismissedButtonIndex == alert.cancelButtonIndex
return
let picker = UIImagePickerController(…)
promiseViewController(picker).then { (img, imgData) in
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
return CLLocationManager.promise().then { located in
return NSURLConnection.GET("share.com/token/\(located.latitude)/\(located.longitude)")
}.finally {
UIApplication.sharedApplication().networkActivityIndicatorVisible = false
}.then { (json: NSDictionary) in
let messagevc = MFMessageViewController(…)
messagevc.to = json["to_email"]
messagevc.body = json["message_text"]
messagevc.addAttachmentData(imgData, typeIdentifier:kUTTypeJPEG, filename:"image.jpeg")
return promiseViewController(messagevc)
}
}.catch { error in
// because we returned promises in the above handler, any errors
// that may occur during execution of the chain will be caught here
UIAlertView(errors).show()
})
})
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