Events
ElementEvent
iOS Element events are triggered whenever a user types into an element text field. An ElementEvent
is the struct that gets passed into the subject’s receiveValue
function. The following are properties on the ElementEvent
struct:
Property | Description |
---|---|
type | The event type for the ElementEvent . |
complete | Whether the input valid and maskSatisfied properties are true . |
valid | Whether the input is valid according to validation for each element. |
maskSatisfied | Whether the input satisfies the mask length requirements. |
details | An array of ElementEventDetail describing more information about the element event. |
ElementEvent Types
The following are the available element event types and their descriptions.
Type | Description |
---|---|
textChange | All elements emit this event when a user changes an element's value. |
focus | All elements emit this event on textFieldDidBeginEditing . |
blur | All elements emit this event on textFieldDidEndEditing . |
maskChange | CardVerificationCodeUITextField elements emit this event when its mask has changed. |
ElementEventDetail
Property | Description |
---|---|
type | A String describing the type of detail. |
message | A String containing the message for the detail. |
ElementEventDetail Types
The following are the available element event detail types and their descriptions.
Type | Description |
---|---|
cardBrand | CardNumberUITextField elements emit a card brand name when a card number can be identified. |
cardLast4 | CardNumberUITextField elements emit the last 4 digits of a card number when the input is considered complete . |
cardBin | CardNumberUITextField elements emit the first 6 or 8 digits of a card number when the input is considered complete . It is 6 digits for card numbers less than 16 digits long and 8 otherwise. |
Usage
You can observe element events through the PassThroughSubject subject field on every element.
private var cancellables = Set<AnyCancellable>()
...
myTextField.subject.sink { completion in
...
} receiveValue: { elementEvent in
...
}.store(in: &cancellables)
Using Metadata for Event Values
Instead of subscribing to events, the same properties can be accessed at any time from the metadata
property on all elements.
Additionally, the card related event details can be accessed from the cardMetadata
property only on CardNumberUITextField
.
The following are the available properties accessible from metadata
.
Property | Type | Description |
---|---|---|
complete | Bool | Whether the input valid and maskSatisfied properties are true . |
valid | Bool | Whether the input is valid according to validation for each element. |
maskSatisfied | Bool | Whether the input satisfies the mask length requirements. |
The following are the available properties accessible from cardMetadata
.
Property | Type | Description |
---|---|---|
cardBrand | String | Card brand name when a card number can be identified. |
cardLast4 | String | Last 4 digits of a card number when the input is considered complete . |
cardBin | String | First 6 or 8 digits of a card number when the input is considered complete . It is 6 digits for card numbers less than 16 digits long and 8 otherwise. |