Map and HTTP Stuffs

I made a QONQR API app thing. First time using iOS map and HTTP APIs.

Here was a few gotcha's I ran into, in reverse order.

Setting the map pins is done with MKAnnotation protocol. A protocol is like, a set of methods that an object has to abide by in order to pose as some certain thing or another, I think. To get the map pins to show up I had to make a Map Pin class as described here.

Inverted Color Fix

Finally figured out how to solve my problem about getting the app to know when there's been an invert color notification on iOS. I mentioned it on the dev forums here.

Commas in your decimals

Had to use commas in decimals for Germany. Here's how

floating point comparisons in CoreData fetch requests

I had to use a predicate like this in order to compare a test value to another one in my predicate so that things were working good.

[NSPredicate predicateWithFormat:@"abs(value - %f) < 0.01", test];

Here was the question I asked:

http://stackoverflow.com/questions/19713261/how-would-you-make-a-predicate-in-coredata-to-search-for-a-float-within-a-tolera

I guess it turns out you can use SQLIte functions like abs() and cetera for more shit. Yay woo. I was led to this because the BETWEEN function doesn't work with floats, but crashes. You get the "unrecognized selector nsnumber" type error.

See also:

Predicate Programming Guide

Getting Stuck

Predicate Format String Syntax

Creating Predicates