NSDictionary initWithObjectsAndKeys example ios

initWithObjectsAndKeys:

Initializes a newly allocated dictionary with entries constructed from the specified set of values and keys.

- (id)initWithObjectsAndKeys:(id)firstObject , ...

Parameters

firstObject

The first value to add to the new dictionary.

...

First the key for firstObject, then a null-terminated list of alternating values and keys. If any key is nil, anNSInvalidArgumentException is raised.

Discussion of [NSDictionary initWithObjectsAndKeys]

This method is similar to initWithObjects:forKeys:, differing only in the way in which the key-value pairs are specified.

Example of [NSDictionary initWithObjectsAndKeys]

NSDictionary *dict = [[NSDictionary alloc] initWithObjectsAndKeys:

@"value1", @"key1", @"value2", @"key2", nil];

Example of [NSDictionary initWithObjectsAndKeys]

NSDictionary *qDictionary = [[NSDictionary alloc]
    initWithObjectsAndKeys:question,@"questionText",
                           [NSNumber numberWithInteger:questionId],@"questionId",
                           [NSNumber numberWithBool:userAnswer],@"userAnswer",
                           [NSNumber numberWithBool:correctAnswer],@"correctAnswer",
                           nil];

Example of [NSDictionary initWithObjectsAndKeys]

self.originalValues = [[NSDictionary alloc] initWithObjectsAndKeys:
                         place.city ?: [NSNull null], @"city",
                         place.cuisine ?: [NSNull null], @"cuisine",
                         place.latitude ?: [NSNull null], @"latitude",
                         place.longitude ?: [NSNull null], @"longitude",
                         place.name ?: [NSNull null], @"name",
                         place.rating ?: [NSNull null], @"rating",
                         place.state ?: [NSNull null], @"state",
                         place.street ?: [NSNull null], @"street",
                         place.telephone ?: [NSNull null], @"telephone",
                         place.timesVisited ?: [NSNull null], @"times visited",
                         place.uppercaseFirstLetterOfName ?: [NSNull null], @"first letter", 
                         place.website ?: [NSNull null], @"website",
                         place.zipcode ?: [NSNull null], @"zipcode",
                         nil];