Nsfetchedresultscontroller not updating Local hook ups no email needed
This faulting mechanism is designed to enhance performance and reduce memory use.
In general, the faulting mechanism is transparent; when you retrieve an object from an (MOC) you can’t tell (in the normal course of its use) whether it’s a fault or a realized object.
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I really liked the NSFetched Results Controller when it was introduced in i Phone OS 3.0.
It has made it much easier to implement a core data backed table view and removes the need to write a lot of code.
But I have seen this changes only if I reload UITable View Controller entirely. How to refresh table View cells immediately after updating my Persistent Store?
- (void)controller:(NSFetched Results Controller *)controller did Change Object:(id)an Object at Index Path:(NSIndex Path *)index Path for Change Type:(NSFetched Results Change Type)type new Index Path:(NSIndex Path *)new Index Path I am not sure what your complete setup involves but you do need to implement NSFetched Results Controller Delegate protocol methods to dynamically update your tableview cells.
Turning on core data SQL debugging shows what is happening: 2010-03-15 .633 Core Perf Core Data: sql: SELECT 0, t0. To avoid this runtime delay it make sense to compute the section index title (in this the uppercase initial letter of the string) ahead of time and avoid the case insensitive search. The fetch time drops from 0.8731s to 0.2102s which is a 75% improvement.
Adding a new attribute to the core data model to hold this initial letter simplifies the sort descriptor removing the need for a sort comparison selector.
It also seems to do a pretty good job of keeping the memory footprint to a minimum.
However, one thing I have been struggling with is with performance when using a grouped table.
Faults are not affected by this method, since the objects they reference aren’t held in memory, and references themselves normally wouldn’t be affected by updates to their underlying objects.