dontwatchmyprofile - Page 3

What exactly is an "extension" in objective-c?

- by dontWatchMyProfile

It's something different than a category, right?

How to convert a string into an NSDate?

Let's say I have something like 30-10-2025 12:53, how could I convert that to an NSDate? I guess there's some class that takes this plus an format string that tells it how the date looks as a string, so it can parse it... where must I look?

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Is there any difference in the implementation of these three validation methods?

- by dontWatchMyProfile

Core Data is calling these methods in certain situations: - (BOOL)validateForInsert:(NSError **)outError; - (BOOL)validateForUpdate:(NSError **)outError; - (BOOL)validateForDelete:(NSError **)outError; I wonder if they're doing anything different, or if they're essentially doing the exact same things. As far as I know, these methods call the -validateValue:forKey:error: method once for every property. The only difference I can imagine is in the .validateForDelete: method. I see no reason why to validate an object when it shall be deleted, except for applying delete rules, probably only in the case of the DENY rule.

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What's -mutableSetValueForKey: returning, actually? Is that something special?

- by dontWatchMyProfile

From the docs: You usually access to-many relationships using mutableSetValueForKey:, which returns a proxy object that both mutates the relationship and sends appropriate key-value observing notifications for you. So this returns an "intelligent" NSMutableSet which automatically lets the context delete objects when they get deleted from the set, and reverse? Is that a proxy object?

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How to align an 90 deg rotated label perfectly with the pixels?

- by dontWatchMyProfile

When rotating a label, the text is rendered very ugly. Is there an convenient way to get the label aligned with the pixels? Maybe there is some way of rounding the transform of the view, so that it isn't misaligned?

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What happens when a fault is "fired"?

- by dontWatchMyProfile

What happens when a fault is "fired"?

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What's the staleness interval good for?

- by dontWatchMyProfile

When should I care about the staleness interval in Core Data?

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Which one should I prefer for relasing my custom non-managed properties?

- by dontWatchMyProfile

-willTurnIntoFault or -didTurnIntoFault? I guess it's stupid to release properties in both of them, so I must choose one. Which is the best?

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What's the consequence when Core Data detects an optimistic locking failure when trying to save?

- by dontWatchMyProfile

I get it: When a managed object context saves, the snapshots of all edited objects are compared against the values in the persistent store to see if the PS has changed since the snapshot was made. If it did change, then there's a conflict and optimistic locking failed, according to Apple. But now, what's the consequence of this? What happens next? What are my options in this case?

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How does Undo work?

- by dontWatchMyProfile

How does undo work? Does it copy all the managed objects every time any of the values change? Or does it only copy the actual changes together with an information which objects were affected? Is that heavy or lightweight?

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