CBLDictionary

@protocol CBLDictionary <NSObject, CBLDictionaryFragment, NSFastEnumeration>

CBLDictionary protocol defines a set of methods for reading dictionary data.

Counting Entries

  • The number of entries in the dictionary.

    Declaration

    Objective-C

    @property (readonly, nonatomic) NSUInteger count;

    Swift

    var count: UInt { get }

Accessing Keys

  • An array containing all keys, or an empty array if the dictionary has no entries.

    Declaration

    Objective-C

    @property (readonly, copy, nonatomic) NSArray<NSString *> *_Nonnull keys;

    Swift

    var keys: [String] { get }

Type Setters

  • Gets a property’s value. The object types are CBLBlob, CBLArray, CBLDictionary, NSNumber, or NSString based on the underlying data type; or nil if the property value is NSNull or the property doesn’t exist.

    Declaration

    Objective-C

    - (nullable id)valueForKey:(nonnull NSString *)key;

    Swift

    func value(forKey key: String) -> Any?

    Parameters

    key

    The key.

    Return Value

    The object value or nil.

  • Gets a property’s value as a string. Returns nil if the property doesn’t exist, or its value is not a string.

    Declaration

    Objective-C

    - (nullable NSString *)stringForKey:(nonnull NSString *)key;

    Swift

    func string(forKey key: String) -> String?

    Parameters

    key

    The key.

    Return Value

    The NSString object or nil.

  • Gets a property’s value as a number. Returns nil if the property doesn’t exist, or its value is not a number.

    Declaration

    Objective-C

    - (nullable NSNumber *)numberForKey:(nonnull NSString *)key;

    Swift

    func number(forKey key: String) -> NSNumber?

    Parameters

    key

    The key.

    Return Value

    The NSNumber object or nil.

  • Gets a property’s value as an integer value. Floating point values will be rounded. The value true is returned as 1, false as 0. Returns 0 if the property doesn’t exist or does not have a numeric value.

    Declaration

    Objective-C

    - (NSInteger)integerForKey:(nonnull NSString *)key;

    Swift

    func integer(forKey key: String) -> Int

    Parameters

    key

    The key.

    Return Value

    The integer value.

  • Gets a property’s value as a long long value. Floating point values will be rounded. The value true is returned as 1, false as 0. Returns 0 if the property doesn’t exist or does not have a numeric value.

    Declaration

    Objective-C

    - (long long)longLongForKey:(nonnull NSString *)key;

    Swift

    func longLong(forKey key: String) -> Int64

    Parameters

    key

    The key.

    Return Value

    The long long value.

  • Gets a property’s value as a float value. Integers will be converted to float. The value true is returned as 1.0, false as 0.0. Returns 0.0 if the property doesn’t exist or does not have a numeric value.

    Declaration

    Objective-C

    - (float)floatForKey:(nonnull NSString *)key;

    Swift

    func float(forKey key: String) -> Float

    Parameters

    key

    The key.

    Return Value

    The float value.

  • Gets a property’s value as a double value. Integers will be converted to double. The value true is returned as 1.0, false as 0.0. Returns 0.0 if the property doesn’t exist or does not have a numeric value.

    Declaration

    Objective-C

    - (double)doubleForKey:(nonnull NSString *)key;

    Swift

    func double(forKey key: String) -> Double

    Parameters

    key

    The key.

    Return Value

    The double value.

  • Gets a property’s value as a boolean. Returns YES if the value exists, and is either true or a nonzero number.

    Declaration

    Objective-C

    - (BOOL)booleanForKey:(nonnull NSString *)key;

    Swift

    func boolean(forKey key: String) -> Bool

    Parameters

    key

    The key.

    Return Value

    The boolean value.

  • Gets a property’s value as an NSDate. JSON does not directly support dates, so the actual property value must be a string, which is then parsed according to the ISO-8601 date format (the default used in JSON.) Returns nil if the value doesn’t exist, is not a string, or is not parseable as a date. NOTE: This is not a generic date parser! It only recognizes the ISO-8601 format, with or without milliseconds.

    Declaration

    Objective-C

    - (nullable NSDate *)dateForKey:(nonnull NSString *)key;

    Swift

    func date(forKey key: String) -> Date?

    Parameters

    key

    The key.

    Return Value

    The NSDate object or nil.

  • Get a property’s value as a CBLBlob. Returns nil if the property doesn’t exist, or its value is not a CBLBlob.

    Declaration

    Objective-C

    - (nullable CBLBlob *)blobForKey:(nonnull NSString *)key;

    Swift

    func blob(forKey key: String) -> CBLBlob?

    Parameters

    key

    The key.

    Return Value

    The CBLBlob object or nil.

  • Get a property’s value as a CBLArray, which is a mapping object of an array value. Returns nil if the property doesn’t exists, or its value is not an array.

    Declaration

    Objective-C

    - (nullable CBLArray *)arrayForKey:(nonnull NSString *)key;

    Swift

    func array(forKey key: String) -> CBLArray?

    Parameters

    key

    The key.

    Return Value

    The CBLArray object or nil.

  • Get a property’s value as a CBLDictionary, which is a mapping object of a dictionary value. Returns nil if the property doesn’t exists, or its value is not a dictionary.

    Declaration

    Objective-C

    - (nullable CBLDictionary *)dictionaryForKey:(nonnull NSString *)key;

    Swift

    func forKey(_ key: String) -> CBLDictionary?

    Parameters

    key

    The key.

    Return Value

    The CBLDictionary object or nil.

Check existence

  • Tests whether a property exists or not. This can be less expensive than -valuetForKey:, because it does not have to allocate an NSObject for the property value.

    Declaration

    Objective-C

    - (BOOL)containsValueForKey:(nonnull NSString *)key;

    Swift

    func containsValue(forKey key: String) -> Bool

    Parameters

    key

    The key.

    Return Value

    The boolean value representing whether a property exists or not.

Data

  • Gets content of the current object as an NSDictionary. The value types of the values contained in the returned NSArray object are CBLBlob, NSArray, NSDictionary, NSNumber, NSNull, and NSString.

    Declaration

    Objective-C

    - (nonnull NSDictionary<NSString *, id> *)toDictionary;

    Swift

    func toDictionary() -> [String : Any]

    Return Value

    The NSDictionary object representing the content of the current object.