Tutorial by Examples: annotations

For creating custom annotations we need to decide Target - on which these annotations will work on like field level, method level, type level etc. Retention - to what level annotation will be available. For this, we have built in custom annotations. Check out these mostly used ones: @Target...
We use type annotations to avoid ambiguity. Type applications can be used for the same purpose. For example x :: Num a => a x = 5 main :: IO () main = print x This code has an ambiguity error. We know that a has a Num instance, and in order to print it we know it needs a Show instance. T...
Swift: mapView.showAnnotations(mapView.annotations, animated: true) Objective-C: [mapView showAnnotations:mapView.annotations animated:YES]; Demo:

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