Users interact with mobile apps mainly through touch. They can use a combination of gestures, such as tapping on a button, scrolling a list, or zooming on a map.
React Native provides components to handle common gestures, such as taps and swipes, as well as a comprehensive gesture responder system to allow for more advanced gesture recognition.
You can use "Touchable" components when you want to capture a tapping gesture. They take a function through the
onPress props which will be called when the touch begins and ends within the bounds of the component.
Tappable components should provide feedback that show the user what is handling their touch, and what will happen when they lift their finger. The user should also be able to cancel a tap by dragging their finger away.
Which component you use will depend on what kind of feedback you want to provide:
Generally, you can use TouchableHighlight anywhere you would use a button or link on web. The view's background will be darkened when the user presses down on the button.
You may consider using TouchableNativeFeedback on Android to display ink surface reaction ripples that respond to the user's touch.
TouchableOpacity can be used to provide feedback by reducing the opacity of the button, allowing the background to be seen through while the user is pressing down.
If you need to handle a tap gesture but you don't want any feedback to be displayed, use TouchableWithoutFeedback.
In some cases, you may want to detect when a user presses and holds a view for a set amount of time. These long presses can be handled by passing a function to the
onLongPress props of any of the touchable components listed above.
A common pattern to many mobile apps is the scrollable list of items. Users interact with these using panning or swiping gestures. The ScrollView component displays a list of items that can be scrolled using these gestures.
ScrollViews can scroll vertically or horizontally, and can be configured to allow paging through views using swiping gestures by using the
pagingEnabled props. Swiping horizontally between views can also be implemented on Android using the ViewPagerAndroid component.
A ListView is a special kind of ScrollView that is best suited for displaying long vertical lists of items. It can also display section headers and footers, similar to
UITableViews on iOS.
A ScrollView with a single item can be used to allow the user to zoom content. Set up the
minimumZoomScale props and your user will be able to use pinch and expand gestures to zoom in and out.
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