Scheduler Class

Module: cc

Scheduler is responsible of triggering the scheduled callbacks.
You should not use NSTimer. Instead use this class.

There are 2 different types of callbacks (selectors):

- update callback: the 'update' callback will be called every frame. You can customize the priority.<br/>
- custom callback: A custom callback will be called every frame, or with a custom interval of time<br/>

The 'custom selectors' should be avoided when possible. It is faster, and consumes less memory to use the 'update callback'. *

Index

Properties

• PRIORITY_SYSTEM Number Priority level reserved for system services.
• PRIORITY_NON_SYSTEM Number Minimum priority level for user scheduling.

Methods

• enableForTarget This method should be called for any target which needs to schedule tasks, and this method should be called before any scheduler API usage.
• setTimeScale Default is 1.0.
• getTimeScale Returns time scale of scheduler.
• update 'update' the scheduler.
• schedule

  ...

• scheduleUpdate Schedules the update callback for a given target,...
• unschedule Unschedules a callback for a callback and a given target.
• unscheduleUpdate Unschedules the update callback for a given target.
• unscheduleAllForTarget Unschedules all scheduled callbacks for a given target.
• unscheduleAll Unschedules all scheduled callbacks from all targets including the system callbacks....
• unscheduleAllWithMinPriority Unschedules all callbacks from all targets with a minimum priority....
• isScheduled Checks whether a callback for a given target is scheduled.
• pauseAllTargets Pause all selectors from all targets....
• pauseAllTargetsWithMinPriority Pause all selectors from all targets with a minimum priority.
• resumeTargets Resume selectors on a set of targets....
• pauseTarget Pauses the target....
• resumeTarget Resumes the target....
• isTargetPaused Returns whether or not the target is paused.

Details

Properties

PRIORITY_SYSTEM

Priority level reserved for system services.

PRIORITY_NON_SYSTEM

Minimum priority level for user scheduling.

Methods

enableForTarget

This method should be called for any target which needs to schedule tasks, and this method should be called before any scheduler API usage. This method will add a _id property if it doesn't exist.

Parameters

• target Object

setTimeScale

Modifies the time of all scheduled callbacks.
You can use this property to create a 'slow motion' or 'fast forward' effect.
Default is 1.0. To create a 'slow motion' effect, use values below 1.0.
To create a 'fast forward' effect, use values higher than 1.0.
Note：It will affect EVERY scheduled selector / action.

Parameters

• timeScale Number

getTimeScale

Returns time scale of scheduler.

update

'update' the scheduler. (You should NEVER call this method, unless you know what you are doing.)

Parameters

• dt Number delta time

schedule

The scheduled method will be called every 'interval' seconds.
If paused is YES, then it won't be called until it is resumed.
If 'interval' is 0, it will be called every frame, but if so, it recommended to use 'scheduleUpdateForTarget:' instead.
If the callback function is already scheduled, then only the interval parameter will be updated without re-scheduling it again.
repeat let the action be repeated repeat + 1 times, use cc.macro.REPEAT_FOREVER to let the action run continuously
delay is the amount of time the action will wait before it'll start

Parameters

• callback Function
• target Object
• interval Number
• repeat Number
• delay Number
• paused Boolean

Examples

//register a schedule to scheduler
cc.director.getScheduler().schedule(callback, this, interval, !this._isRunning);

scheduleUpdate

Schedules the update callback for a given target, During every frame after schedule started, the "update" function of target will be invoked.

Parameters

• target Object
• priority Number
• paused Boolean

unschedule

Unschedules a callback for a callback and a given target. If you want to unschedule the "update", use unscheduleUpdate()

Parameters

• callback Function The callback to be unscheduled
• target Object The target bound to the callback.

unscheduleUpdate

Unschedules the update callback for a given target.

Parameters

• target Object The target to be unscheduled.

unscheduleAllForTarget

Unschedules all scheduled callbacks for a given target. This also includes the "update" callback.

Parameters

• target Object The target to be unscheduled.

unscheduleAll

Unschedules all scheduled callbacks from all targets including the system callbacks.
You should NEVER call this method, unless you know what you are doing.

unscheduleAllWithMinPriority

Unschedules all callbacks from all targets with a minimum priority.
You should only call this with PRIORITY_NON_SYSTEM_MIN or higher.

Parameters

• minPriority Number The minimum priority of selector to be unscheduled. Which means, all selectors which

   priority is higher than minPriority will be unscheduled.
  

isScheduled

Checks whether a callback for a given target is scheduled.

Parameters

• callback Function The callback to check.
• target Object The target of the callback.

pauseAllTargets

Pause all selectors from all targets.
You should NEVER call this method, unless you know what you are doing.

pauseAllTargetsWithMinPriority

Pause all selectors from all targets with a minimum priority.
You should only call this with kCCPriorityNonSystemMin or higher.

Parameters

• minPriority Number

resumeTargets

Resume selectors on a set of targets.
This can be useful for undoing a call to pauseAllCallbacks.

Parameters

• targetsToResume Array

pauseTarget

Pauses the target.
All scheduled selectors/update for a given target won't be 'ticked' until the target is resumed.
If the target is not present, nothing happens.

Parameters

• target Object

resumeTarget

Resumes the target.
The 'target' will be unpaused, so all schedule selectors/update will be 'ticked' again.
If the target is not present, nothing happens.

Parameters

• target Object

isTargetPaused

Returns whether or not the target is paused.

Parameters

• target Object