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This is going to be something really stupid, but I have this code in my cellForRowAtIndexPath:
if ([self.indexPathSelected compare:indexPath] == NSOrderedSame)
{
NSLog(@" %d %d %d %d", self.indexPathSelected.row, self.indexPathSelected.section, indexPath.row, indexPath.section);
}
This prints:
0 0 0 0
0 0 1 0
0 0 2 0
0 0 3 0
0 0 4 0
0 0 5 0
I was expecting it to only print 0 0 0 0.
What am I doing wrong here?
851
=== is used for detecting when two variables reference the exact same instance. Interestingly, the indexPath1 === indexPath2 shows that NSIndexPath is built to share the same instance whenever the values match, so even if you were comparing instances, it would still be valid.
An object containing a list of indexes that bridges to IndexPath ; use NSIndexPath when you need reference semantics or other Foundation-specific behavior. iOS 2.0+ iPadOS 2.0+ macOS 10.4+ Mac Catalyst 13.0+ tvOS 9.0+ watchOS 2.0+
NSIndexPath has a read-only structure that contains two Int property sections and rows if you're working with UITableViews or a section and item if you're working with UICollectionViews . You create them with the NSIndexPath:forRow:inSection: factory method: Swift. 1. let indexPath = NSIndexPath(forRow: 1, inSection: 0 ...
Index path is generally a set of two values representing row and section of a table view. Index path can be created in objective C as well as Swift as both are native language of iOS Development.
Since you're setting indexPathSelected to nil, you want to make sure it's non-nil before doing a compare.
if (self.indexPathSelected && [self.indexPathSelected compare:indexPath] == NSOrderedSame)
{
NSLog(@" %d %d %d %d", self.indexPathSelected.row, self.indexPathSelected.section, indexPath.row, indexPath.section);
}
According to the documentation on NSIndexPath's compare method:
Parameters
indexPath
Index path to compare.
This value must not be nil. If the value is nil, the behavior is undefined.
60
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