CODEWITHSUNDEEP
objective-ciosternary-operator
ChrisP
ChrisP

Reputation: 10116

What are the limits of using a ternary operator in Objective-C?

The following Objective-C statement does not work correctly.

cell.templateTitle.text=[(NSDictionary*) [self.inSearchMode?self.templates:self.filteredTemplates objectAtIndex:indexPath.row] objectForKey:@"title"];

However, if I split it into an if() statement it works fine.

if(self.inSearchMode){
  categorize=[(NSDictionary*)[self.filteredTemplates objectAtIndex:indexPath.row] objectForKey:@"categorize"];
} else {
  categorize=[(NSDictionary*)[self.templates objectAtIndex:indexPath.row] objectForKey:@"categorize"]; 
}

What are the limitations of using the ternary operator in Objective-C? In other languages like C# the above ternary statement would have worked correctly.

Upvotes: 4

Views: 1936

Answers (2)

macbirdie
macbirdie

Reputation: 16193

@cesarislaw is probably right about the order of operations.

However, the code will be more readable if you do something like this instead (and if you really insist on use of the ternary operator ;) ):

NSDictionary * templates = (NSDictionary *) (self.inSearchMode ? self.filteredTemplates : self.templates);

categorize = [[templates objectAtIndex:indexPath.row] objectForKey:@"categorize"];

Upvotes: 8

cesarislaw
cesarislaw

Reputation: 1599

My guess is that it's an order of operations issue. Have you tried:

[(self.inSearchMode?self.templates:self.filteredTemplates) objectAtIndex:indexPath.row]

(notice added parens)

Upvotes: 10

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