There is no “first” element in an NSDictionary; its members have no guaranteed order. If you just want one object from a dictionary, but don’t care which key it’s associated with, you can do: id val = nil; NSArray *values = [yourDict allValues]; if ([values count] != 0) val = [values objectAtIndex:0];
The first NSLog works fine displaying the contents of the dictionary. The second log throws the following exception… The program tries to trick you, it just looks like it is your dictionary because your dictionary is inside the notification. From the exception you can see that your object actually is from a class named NSConcreteNotification. … Read more
The NSDictionary Method keysSortedByValueUsingComparator: should do the trick. You just need a method returning an NSComparisonResult that compares the object’s values. Your Dictionary is NSMutableDictionary * myDict; And your Array is NSArray *myArray; myArray = [myDict keysSortedByValueUsingComparator: ^(id obj1, id obj2) { if ([obj1 integerValue] > [obj2 integerValue]) { return (NSComparisonResult)NSOrderedDescending; } if ([obj1 integerValue] … Read more
use: let jsonDic = NSJSONSerialization.JSONObjectWithData(jsonData, options: NSJSONReadingOptions.MutableContainers, error: &error) as Dictionary<String, AnyObject>;
ARC changed the way bridging works. NSDictionary *original = [NSDictionary dictionaryWithObject:@”World” forKey:@”Hello”]; CFDictionaryRef dict = (__bridge CFDictionaryRef)original; NSDictionary *andBack = (__bridge NSDictionary*)dict; NSLog(@”%@”, andBack);
You can sort the keys and then create an NSMutableArray by iterating over them. NSArray *sortedKeys = [[dict allKeys] sortedArrayUsingSelector: @selector(compare:)]; NSMutableArray *sortedValues = [NSMutableArray array]; for (NSString *key in sortedKeys) [sortedValues addObject: [dict objectForKey: key]];
Use -mutableCopy. NSDictionary *d; NSMutableDictionary *m = [d mutableCopy]; Note that -mutableCopy returns id (Any in Swift) so you will want to assign / cast to the right type. It creates a shallow copy of the original dictionary.
Try this magic: NSDictionary *dict = [NSDictionary dictionaryWithObjects:records forKeys:[records valueForKey:@”intField”]]; FYI this is possible because of this built-in feature: @interface NSArray(NSKeyValueCoding) /* Return an array containing the results of invoking -valueForKey: on each of the receiver’s elements. The returned array will contain NSNull elements for each instance of -valueForKey: returning nil. */ – (id)valueForKey:(NSString *)key;
Hmm. Simple NSLog( @”%@”, dictionaryYouWantToPrint ); outputs following result for me: { id = 1; matchCount = 0; matchPattern = abcdef; number = “123456”; sessionID = 5; status = Unknown; timerStart = 1367229348; }
It wants an actual object… use NSNull [NSNull null];