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  2. TweenService

TweenService

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  1. apireference
  2. tweenservice

TweenService

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Tweens are used to interpolate the properties of instances. These can be used to create animations for various Roblox objects. Almost any numeric property can be tweened using TweenService. Note that only specific types of properties can be used with TweenService. The types of properties that can be tweened are:

  • number
  • bool
  • DataType/CFrame
  • DataType/Rect
  • DataType/Color3
  • DataType/UDim
  • DataType/UDim2
  • DataType/Vector2
  • DataType/Vector2int16
  • DataType/Vector3
  • DataType/EnumItem

TweenService’s constructor function, TweenService/Create, takes information about the animation and generates the Tween object which can be used to play the animation. Note that Tweens can animate multiple properties at the same time.

Details on how the interpolation of the tween is to be carried out are given in the tweenInfo parameter of TweenService:Create(). The TweenInfo data type includes a range of properties that can be used to achieve various styles of animation, including reversing and looping Tweens (see examples).

Multiple tweens can be played on the same object at the same time, but they must not be animating the same property. If two tweens attempt to modify the same property, the initial tween will be cancelled and overwritten by the most recent tween (see examples).

Although other methods exist for tweening objects, such as GuiObject/TweenSizeAndPosition, TweenService allows multiple properties to be modified and for the animation to be paused and cancelled at any point.

Properties

Inherited from Instance: Show Hide

bool

Archivable

Determines if an Instance can be cloned using /Instance/Clone or saved to file.
string

ClassName

[ReadOnly] [NotReplicated]

A read-only string representing the class this Instance belongs to
int

DataCost

[Hidden] [ReadOnly] [NotReplicated] [Deprecated]

The cost of saving the instance using data persistence.
string

Name

A non-unique identifier of the Instance
Instance

Parent

[NotReplicated]

Determines the hierarchical parent of the Instance
bool

RobloxLocked

[Hidden]

A deprecated property that used to protect CoreGui objects
int64

SourceAssetId

[Hidden] [NotReplicated]
bool

archivable

[Hidden] [NotReplicated] [Deprecated]
string

className

[ReadOnly] [NotReplicated] [Deprecated]

Functions

Tween

Create ( Instance instance , TweenInfo tweenInfo , Dictionary propertyTable )

Creates a new Tween given the object whose properties are to be tweened, a datatype/TweenInfo and a dictionary of goal property values.
float

GetValue ( float alpha , EasingStyle easingStyle , EasingDirection easingDirection )

Calculates a new alpha given an Enum/EasingStyle and Enum/EasingDirection

Inherited from Instance: Show Hide

void

ClearAllChildren ( )

This function destroys all of an Instance’s children.
Instance

Clone ( )

Create a copy of an object and all its descendants, ignoring objects that are not Instance/Archivable|Archivable
void

Destroy ( )

Sets the Instance/Parent property to nil, locks the Instance/Parent property, disconnects all connections, and calls Destroy on all children.
Instance

FindFirstAncestor ( string name )

Returns the first ancestor of the Instance whose Instance/Name is equal to the given name.
Instance

FindFirstAncestorOfClass ( string className )

Returns the first ancestor of the Instance whose Instance/ClassName is equal to the given className.
Instance

FindFirstAncestorWhichIsA ( string className )

Returns the first ancestor of the Instance for whom Instance/IsA returns true for the given className.
Instance

FindFirstChild ( string name , bool recursive )

Returns the first child of the Instance found with the given name.
Instance

FindFirstChildOfClass ( string className )

Returns the first child of the Instance whose Instance/ClassName|ClassName is equal to the given className.
Instance

FindFirstChildWhichIsA ( string className , bool recursive )

Returns the first child of the Instance for whom Instance/IsA returns true for the given className.
Instance

FindFirstDescendant ( string name )

Returns the first descendant found with the given Instance/Name.
Actor

GetActor ( )

Returns the Actor associated with the Instance, usually the first Actor ancestor
Variant

GetAttribute ( string attribute )

Returns the attribute which has been assigned to the given name
RBXScriptSignal

GetAttributeChangedSignal ( string attribute )

Returns an event that fires when the given attribute changes
Dictionary

GetAttributes ( )

Returns a dictionary of string → variant pairs for each of the Instance|Instance’s attributes
Objects

GetChildren ( )

Returns an array containing all of the Instance’s children.
string

GetDebugId ( int scopeLength )

[NotBrowsable]

Returns a coded string of the Instances DebugId used internally by Roblox.
Array

GetDescendants ( )

[CustomLuaState]

Returns an array containing all of the descendants of the instance
string

GetFullName ( )

Returns a string describing the Instance’s ancestry.
RBXScriptSignal

GetPropertyChangedSignal ( string property )

Get an event that fires when a given property of an object changes.
bool

IsA ( string className )

[CustomLuaState]

Returns true if an Instance’s class matches or inherits from a given class
bool

IsAncestorOf ( Instance descendant )

Returns true if an Instance is an ancestor of the given descendant.
bool

IsDescendantOf ( Instance ancestor )

Returns true if an Instance is a descendant of the given ancestor.
void

Remove ( )

[Deprecated]

Sets the object’s Parent to nil, and does the same for all its descendants.
void

SetAttribute ( string attribute , Variant value )

Sets the attribute with the given name to the given value
Instance

WaitForChild ( string childName , double timeOut )

[CustomLuaState] [CanYield]

Returns the child of the Instance with the given name. If the child does not exist, it will yield the current thread until it does.
Objects

children ( )

[Deprecated]

Returns an array of the object’s children.
Instance

clone ( )

[Deprecated]
void

destroy ( )

[Deprecated]
Instance

findFirstChild ( string name , bool recursive )

[Deprecated]
Objects

getChildren ( )

[Deprecated]
bool

isA ( string className )

[Deprecated] [CustomLuaState]
bool

isDescendantOf ( Instance ancestor )

[Deprecated]
void

remove ( )

[Deprecated]

Events

Inherited from Instance: Show Hide

RBXScriptSignal

AncestryChanged ( Instance child , Instance parent )

Fires when the Instance/Parent property of the object or one of its ancestors is changed.
RBXScriptSignal

AttributeChanged ( string attribute )

Fires whenever an attribute is changed on the Instance
RBXScriptSignal

Changed ( string property )

Fired immediately after a property of an object changes.
RBXScriptSignal

ChildAdded ( Instance child )

Fires after an object is parented to this Instance.
RBXScriptSignal

ChildRemoved ( Instance child )

Fires after a child is removed from this Instance.
RBXScriptSignal

DescendantAdded ( Instance descendant )

Fires after a descendant is added to the Instance
RBXScriptSignal

DescendantRemoving ( Instance descendant )

Fires immediately before a descendant of the Instance is removed.
RBXScriptSignal

Destroying ( )

Fires immediately before the instance is destroyed via Instance/Destroy.
RBXScriptSignal

childAdded ( Instance child )

[Deprecated]

Code Samples

Tween Conflict

This code sample includes a demonstration of tween conflict. A part is instanced in the Workspace, and two tweens are created that attempt to move the part in conflicting directions.

When both tweens are played, the first tween is cancelled and overwritten by the second tween. This can be seen as the part moves along the Y axis as opposed to the Z axis.

To further demonstrate this, connections have been made for both tweens to the Tween.Completed event. Upon playing the tweens, the following is printed.

tween1: Enum.PlaybackState.Cancelled
tween2: Enum.PlaybackState.Completed

These prints show that the first tween was cancelled (firing the Completed event) immediately upon the second tween being played. The second tween then went on to play until completion.

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Tween an EnumItem

The following example demonstrates how to tween an EnumItem property, such as a Part/Shape|part's shape.

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Looping a Tween

This code sample includes an example of how a looped tween can be created.

A part is instanced in the Workspace, and a Tween is created using TweenService:Create that is set to animate it’s position along the Y axis. The looped effect is achieved by modifying the TweenInfo used in TweenService:Create. Specifically, when RepeatCount is set to be less than 0 the tween will play indefinitely. Also, setting Reverses to true will cause the tween to play in reverse once it has reached it’s destination. In combination this creates a looped effect.

The correct way to make a tween play indefinitely is to set RepeatCount to -1. Developers should avoid using large numbers (or math.huge) as a substitute as this is unstable and may stop working at any point.

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Tween Creation

In this example a Tween is created to animate the position and color of a Part. Because the position and color are part of the same tween, they will change at the exact same rate and will reach their goal at the same time.

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Pausing a Tween

This sample demonstrates how the playback of a tween can be paused and resumed.

A part is instanced in the Workspace and a tween is setup that will move it 50 studs along the X axis. However during playback the tween is briefly paused, then resumed. To further illustrate this the BrickColor of the part changes from red to green whilst it is paused.

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Tween Accessory