问题
I have a view controller that has three skscenes as children.
When I transition from one to another, the old skscene doesn't get deallocated.
I want it to get deallocated as if it was never there.
Example:
When I first load the app, only 1 skscene is visible (say it takes up 100mb memory), then I transition to another (100mb more), and then the third (300mb memory).
I would end up with 300mb memory and I want to have 100 at all times.
How can I achieve this?
My view controller:
//
// ViewController.m
// Paddle Jumper
//
// Created by Chance Daniel on 1/18/14.
// Copyright (c) 2014 Max Hudson. All rights reserved.
//
#import "Flurry.h"
#import "ViewController.h"
#import "startViewController.h"
@implementation ViewController{
BOOL sceneSetUp;
}
- (void)viewWillLayoutSubviews
{
if(!sceneSetUp){
[super viewWillLayoutSubviews];
// Configure the view.
SKView * skView = (SKView *)self.view;
//skView.showsFPS = YES;
//skView.showsNodeCount = YES;
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if([[defaults objectForKey:@"firstTime"] intValue] != 1){
[defaults setObject:[NSNumber numberWithInt:1] forKey:@"firstTime"];
[defaults setObject:@"ggr" forKey:@"skinSelected"];
[defaults setObject:[NSNumber numberWithInt:2] forKey:@"ggrOwned"];
[defaults setObject:[NSNumber numberWithInt:5000] forKey:@"gona"];
[defaults setObject:[NSNumber numberWithInt:1500] forKey:@"points"];
[defaults setObject:[NSNumber numberWithInt:7] forKey:@"livesLeftValue"];
[defaults setObject:[NSNumber numberWithInt:3] forKey:@"shieldsLeftValue"];
[defaults setObject:[NSNumber numberWithInt:2] forKey:@"lvlTwoLeftValue"];
[defaults setObject:[NSNumber numberWithInt:0] forKey:@"lvlThreeLeftValue"];
}
if(![defaults objectForKey:@"tut_game1"]){
[defaults setObject:[NSNumber numberWithInt:1] forKey:@"tut_game1"];
[defaults setObject:[NSNumber numberWithInt:1] forKey:@"tut_store"];
[defaults setObject:[NSNumber numberWithInt:1] forKey:@"tut_daily"];
}
[defaults synchronize];
// Create and configure the scene.
SKScene * startScene = [StartViewController sceneWithSize:skView.bounds.size];
startScene.scaleMode = SKSceneScaleModeAspectFill;
// Present the scene.
[skView presentScene:startScene];
//[skView presentScene:scene];
sceneSetUp = YES;
}
}
-(void) switchScene{
}
- (BOOL)shouldAutorotate
{
return YES;
}
- (NSUInteger)supportedInterfaceOrientations
{
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
return UIInterfaceOrientationMaskAllButUpsideDown;
} else {
return UIInterfaceOrientationMaskAll;
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
@end
An SKScene that won't release: //
// SettingsSKScene.m
// Paddle Jumper
//
// Created by Max Hudson on 3/15/14.
// Copyright (c) 2014 Max Hudson. All rights reserved.
//
#import "SettingsSKScene.h"
#import "gameViewController.h"
#import "StoreScene.h"
@interface SettingsSKScene (){
SKSpriteNode *bg;
SKSpriteNode *masterOverlay;
SKSpriteNode *wbox;
SKSpriteNode *gamecenter;
SKSpriteNode *max;
SKSpriteNode *chance;
SKSpriteNode *bryce;
SKSpriteNode *home;
SKSpriteNode *play;
SKSpriteNode *chance_link;
SKSpriteNode *max_link;
SKSpriteNode *bryce_link;
SKSpriteNode *fbButton;
SKSpriteNode *fbToggleYes;
SKSpriteNode *fbToggleNo;
SKLabelNode *story1;
SKLabelNode *story2;
SKLabelNode *story3;
SKLabelNode *chance_name;
SKLabelNode *max_name;
SKLabelNode *bryce_name;
SKLabelNode *chance_role;
SKLabelNode *max_role;
SKLabelNode *bryce_role;
SKLabelNode *chance_handle;
SKLabelNode *max_handle;
SKLabelNode *bryce_handle;
SKTexture *bg_texture;
SKTexture *gamecenter_texture;
SKTexture *wbox_texture;
SKTexture *max_texture;
SKTexture *chance_texture;
SKTexture *bryce_texture;
SKTexture *home_texture;
SKTexture *play_texture;
SKTexture *fb_texture;
SKTexture *toggle_yes_texture;
SKTexture *toggle_no_texture;
}
@end
@implementation SettingsSKScene
-(id) initWithSize:(CGSize)size{
if(self = [super initWithSize:size]){
masterOverlay = [SKSpriteNode spriteNodeWithColor:[SKColor blackColor] size:self.frame.size];
masterOverlay.position = CGPointMake(self.frame.size.width/2, self.frame.size.height/2);
[self addChild:masterOverlay];
bg_texture = [SKTexture textureWithImageNamed:@"settings_bg"];
wbox_texture = [SKTexture textureWithImageNamed:@"white_rect_bg"];
gamecenter_texture = [SKTexture textureWithImageNamed:@"gc"];
max_texture = [SKTexture textureWithImageNamed:@"max"];
chance_texture = [SKTexture textureWithImageNamed:@"chance"];
bryce_texture = [SKTexture textureWithImageNamed:@"bryce"];
home_texture = [SKTexture textureWithImageNamed:@"home_light"];
play_texture = [SKTexture textureWithImageNamed:@"play_light"];
fb_texture = [SKTexture textureWithImageNamed:@"fb_light"];
toggle_yes_texture = [SKTexture textureWithImageNamed:@"toggle_yes"];
toggle_no_texture = [SKTexture textureWithImageNamed:@"toggle_no"];
NSArray *to_preload = @[bg_texture, wbox_texture, gamecenter_texture, max_texture, chance_texture, bryce_texture, home_texture, play_texture, fb_texture, toggle_yes_texture, toggle_no_texture];
[SKTexture preloadTextures:to_preload withCompletionHandler:^{
[self fadeRemove:masterOverlay];
[self initialize];
}];
}
return self;
}
-(void) fadeRemove: (SKNode *) node{
double duration = arc4random() % 10;
duration *= 0.05;
SKAction *fadeOut = [SKAction fadeOutWithDuration:0.1+duration];
SKAction *remove = [SKAction runBlock:^{
[node removeFromParent];
}];
[node runAction:[SKAction sequence:@[fadeOut, remove]]];
}
-(void) initialize{
bg = [SKSpriteNode spriteNodeWithTexture:bg_texture];
bg.position = CGPointMake(self.frame.size.width/2, self.frame.size.height/2);
bg.zPosition = 0;
wbox = [SKSpriteNode spriteNodeWithTexture:wbox_texture];
wbox.position = CGPointMake(self.frame.size.width/2, 70);
wbox.alpha = 0.8;
wbox.zPosition = 2;
gamecenter = [SKSpriteNode spriteNodeWithTexture:gamecenter_texture];
gamecenter.position = CGPointMake(self.frame.size.width/2 + 100, self.frame.size.height/2-2);
gamecenter.name = @"gc";
gamecenter.zPosition = 2;
fbButton = [SKSpriteNode spriteNodeWithTexture:fb_texture];
fbButton.size = CGSizeMake(36, 36);
fbButton.position = CGPointMake(self.frame.size.width/2 - 115, self.frame.size.height/2-2);
fbButton.name = @"fb";
fbButton.zPosition = 2;
fbToggleNo = [SKSpriteNode spriteNodeWithTexture:toggle_no_texture];
fbToggleNo.position = CGPointMake(self.frame.size.width/2 - 50, self.frame.size.height/2-2);
fbToggleNo.size = CGSizeMake(fbToggleNo.size.width/3, fbToggleNo.size.height/3);
fbToggleNo.name = @"fbno";
fbToggleNo.zPosition = 2;
fbToggleYes = [SKSpriteNode spriteNodeWithTexture:toggle_yes_texture];
fbToggleYes.position = CGPointMake(self.frame.size.width/2 - 70, self.frame.size.height/2-2);
fbToggleYes.name = @"fbyes";
fbToggleYes.zPosition = 2;
int hpBuffer = 40;
int hpZ = 2;
home = [SKSpriteNode spriteNodeWithTexture:home_texture];
home.position = CGPointMake(hpBuffer, self.frame.size.height - hpBuffer);
home.zPosition = hpZ;
home.name = @"home";
play = [SKSpriteNode spriteNodeWithTexture:play_texture];
play.position = CGPointMake(self.frame.size.width - hpBuffer, self.frame.size.height - hpBuffer);
play.zPosition = hpZ;
play.name = @"play";
[self addChild:bg];
[self addChild:wbox];
[self addChild:gamecenter];
[self addChild:home];
[self addChild:play];
[self addChild:fbButton];
[self addChild:fbToggleNo];
[self addCredits];
[self addStory];
}
-(void) addCredits{
/* images */
int cmbZ = wbox.zPosition + 1;
int cmbY = wbox.position.y;
int cmbXUnit = 132;
int cmbX = self.frame.size.width/2 - (3*cmbXUnit)/2 + 20;
int cmbWidth = 40;
chance = [SKSpriteNode spriteNodeWithTexture:chance_texture];
max = [SKSpriteNode spriteNodeWithTexture:max_texture];
bryce = [SKSpriteNode spriteNodeWithTexture:bryce_texture];
chance.zPosition = cmbZ;
max.zPosition = cmbZ;
bryce.zPosition = cmbZ;
chance.position = CGPointMake(cmbX+cmbXUnit*0, cmbY+3);
max.position = CGPointMake(cmbX+cmbXUnit*1 + 10, cmbY);
bryce.position = CGPointMake(cmbX+cmbXUnit*2 + 10, cmbY+5);
chance.size = CGSizeMake(cmbWidth, (chance.size.height/chance.size.width)*cmbWidth);
max.size = CGSizeMake(cmbWidth, (max.size.height/max.size.width)*cmbWidth);
bryce.size = CGSizeMake(cmbWidth, (bryce.size.height/bryce.size.width)*cmbWidth);
[self addChild:chance];
[self addChild:max];
[self addChild:bryce];
/* names */
int cmb_nameXUnit = 30;
int cmb_nameY = wbox.position.y - 10;
int cmb_nameFontSize = 18;
chance_name = [SKLabelNode labelNodeWithFontNamed:@"BebasNeue"];
max_name = [SKLabelNode labelNodeWithFontNamed:@"BebasNeue"];
bryce_name = [SKLabelNode labelNodeWithFontNamed:@"BebasNeue"];
chance_name.text = @"Chance Daniel";
max_name.text = @"Max Hudson";
bryce_name.text = @"Bryce Daniel";
chance_name.fontColor = [SKColor blackColor];
max_name.fontColor = [SKColor blackColor];
bryce_name.fontColor = [SKColor blackColor];
chance_name.horizontalAlignmentMode = SKLabelHorizontalAlignmentModeLeft;
max_name.horizontalAlignmentMode = SKLabelHorizontalAlignmentModeLeft;
bryce_name.horizontalAlignmentMode = SKLabelHorizontalAlignmentModeLeft;
chance_name.position = CGPointMake(chance.position.x + cmb_nameXUnit, cmb_nameY);
max_name.position = CGPointMake(max.position.x + cmb_nameXUnit, cmb_nameY);
bryce_name.position = CGPointMake(bryce.position.x + cmb_nameXUnit, cmb_nameY);
chance_name.fontSize = cmb_nameFontSize;
max_name.fontSize = cmb_nameFontSize;
bryce_name.fontSize = cmb_nameFontSize;
chance_name.zPosition = cmbZ;
max_name.zPosition = cmbZ;
bryce_name.zPosition = cmbZ;
[self addChild:chance_name];
[self addChild:max_name];
[self addChild:bryce_name];
/* roles */
int cmb_roleY = wbox.position.y - 25;
int cmb_roleFontSize = 11;
chance_role = [SKLabelNode labelNodeWithFontNamed:@"BebasNeue"];
max_role = [SKLabelNode labelNodeWithFontNamed:@"BebasNeue"];
bryce_role = [SKLabelNode labelNodeWithFontNamed:@"BebasNeue"];
chance_role.text = @"Programmer";
max_role.text = @"Programmer";
bryce_role.text = @"Graphic Designer";
chance_role.fontColor = [SKColor darkGrayColor];
max_role.fontColor = [SKColor darkGrayColor];
bryce_role.fontColor = [SKColor darkGrayColor];
chance_role.horizontalAlignmentMode = SKLabelHorizontalAlignmentModeLeft;
max_role.horizontalAlignmentMode = SKLabelHorizontalAlignmentModeLeft;
bryce_role.horizontalAlignmentMode = SKLabelHorizontalAlignmentModeLeft;
chance_role.position = CGPointMake(chance.position.x + cmb_nameXUnit + 19, cmb_roleY);
max_role.position = CGPointMake(max.position.x + cmb_nameXUnit + 12, cmb_roleY);
bryce_role.position = CGPointMake(bryce.position.x + cmb_nameXUnit + 6, cmb_roleY);
chance_role.fontSize = cmb_roleFontSize;
max_role.fontSize = cmb_roleFontSize;
bryce_role.fontSize = cmb_roleFontSize;
chance_role.zPosition = cmbZ;
max_role.zPosition = cmbZ;
bryce_role.zPosition = cmbZ;
[self addChild:chance_role];
[self addChild:max_role];
[self addChild:bryce_role];
/* twitter handles */
int cmb_handY = wbox.position.y - 40;
int cmb_handFontSize = 10;
chance_handle = [SKLabelNode labelNodeWithFontNamed:@"BebasNeue"];
max_handle = [SKLabelNode labelNodeWithFontNamed:@"BebasNeue"];
bryce_handle = [SKLabelNode labelNodeWithFontNamed:@"BebasNeue"];
chance_handle.text = @"@ChanceOfThat";
max_handle.text = @"@max_hud";
bryce_handle.text = @"@BryceOfLife";
chance_handle.fontColor = [SKColor darkGrayColor];
max_handle.fontColor = [SKColor darkGrayColor];
bryce_handle.fontColor = [SKColor darkGrayColor];
chance_handle.position = CGPointMake(chance.position.x, cmb_handY);
max_handle.position = CGPointMake(max.position.x, cmb_handY);
bryce_handle.position = CGPointMake(bryce.position.x, cmb_handY);
chance_handle.fontSize = cmb_handFontSize;
max_handle.fontSize = cmb_handFontSize;
bryce_handle.fontSize = cmb_handFontSize;
chance_handle.zPosition = cmbZ;
max_handle.zPosition = cmbZ;
bryce_handle.zPosition = cmbZ;
[self addChild:chance_handle];
[self addChild:max_handle];
[self addChild:bryce_handle];
/* touchzones */
CGSize cmdL_size = CGSizeMake(120, 70);
SKColor *cmdL_color = [SKColor clearColor];
int cmdLZ = 3;
int cmdLX = cmbX + 40;
chance_link = [SKSpriteNode spriteNodeWithColor:cmdL_color size:cmdL_size];
max_link = [SKSpriteNode spriteNodeWithColor:cmdL_color size:cmdL_size];
bryce_link = [SKSpriteNode spriteNodeWithColor:cmdL_color size:cmdL_size];
chance_link.position = CGPointMake(cmdLX+cmbXUnit*0, cmbY);
max_link.position = CGPointMake(cmdLX+cmbXUnit*1 + 10, cmbY);
bryce_link.position = CGPointMake(cmdLX+cmbXUnit*2 + 10, cmbY);
chance_link.zPosition = cmdLZ;
max_link.zPosition = cmdLZ;
bryce_link.zPosition = cmdLZ;
chance_link.name = @"c_handle";
max_link.name = @"m_handle";
bryce_link.name = @"b_handle";
[self addChild:chance_link];
[self addChild:max_link];
[self addChild:bryce_link];
}
-(void) addStory{
int stX = self.frame.size.width/2;
int stZ = 2;
SKColor *stColor = [SKColor whiteColor];
story1 = [SKLabelNode labelNodeWithFontNamed:@"BebasNeue"];
story2 = [SKLabelNode labelNodeWithFontNamed:@"BebasNeue"];
story3 = [SKLabelNode labelNodeWithFontNamed:@"BebasNeue"];
story1.text = @"Gon";
story2.text = @"Help Gon-Gon and his friends get";
story3.text = @"Back to the time they came from!";
story1.fontColor = stColor;
story2.fontColor = stColor;
story3.fontColor = stColor;
story1.zPosition = stZ;
story2.zPosition = stZ;
story3.zPosition = stZ;
story1.position = CGPointMake(stX, self.frame.size.height - 55);
story1.fontSize = 50;
story2.position = CGPointMake(stX, self.frame.size.height - 95);
story2.fontSize = 30;
story3.position = CGPointMake(stX, self.frame.size.height - 120);
story3.fontSize = 20;
[self addChild:story1];
[self addChild:story2];
[self addChild:story3];
}
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touchUI = [touches anyObject];
CGPoint touchPoint = [touchUI locationInNode:self];
SKNode *touchNode = [self nodeAtPoint:touchPoint];
if([touchNode.name isEqualToString:@"home"]){
StartViewController *svc = [[StartViewController alloc] initWithSize:self.size];
SKTransition *fade = [SKTransition fadeWithColor :[SKColor blackColor] duration:0.4];
[self.view presentScene:svc transition:fade];
}
if([touchNode.name isEqualToString:@"play"]){
gameViewController *gvc = [[gameViewController alloc] initWithSize:self.size];
SKTransition *fade = [SKTransition fadeWithColor :[SKColor blackColor] duration:0.4];
[self.view presentScene:gvc transition:fade];
}
if([touchNode.name isEqualToString:@"gc"]){
NSDictionary * dict = [[NSDictionary alloc]initWithObjectsAndKeys:[NSNumber numberWithBool:1], @"showGC", nil];
[[NSNotificationCenter defaultCenter]postNotificationName:@"kNotificationUpdateBannerView" object:self userInfo:dict];
}
if([touchNode.name isEqualToString:@"c_handle"]){
NSURL *urlApp = [NSURL URLWithString: [NSString stringWithFormat:@"%@", @"twitter:///user?screen_name=ChanceOfThat"]];
int worked = [[UIApplication sharedApplication] openURL:urlApp];
if(!worked){
NSURL *urlApp = [NSURL URLWithString: [NSString stringWithFormat:@"%@", @"https://twitter.com/#!/ChanceOfThat"]];
[[UIApplication sharedApplication] openURL:urlApp];
}
}
if([touchNode.name isEqualToString:@"m_handle"]){
NSURL *urlApp = [NSURL URLWithString: [NSString stringWithFormat:@"%@", @"twitter:///user?screen_name=max_hud"]];
int worked = [[UIApplication sharedApplication] openURL:urlApp];
if(!worked){
NSURL *urlApp = [NSURL URLWithString: [NSString stringWithFormat:@"%@", @"https://twitter.com/#!/max_hud"]];
[[UIApplication sharedApplication] openURL:urlApp];
}
}
if([touchNode.name isEqualToString:@"b_handle"]){
NSURL *urlApp = [NSURL URLWithString: [NSString stringWithFormat:@"%@", @"twitter:///user?screen_name=BryceOfLife"]];
int worked = [[UIApplication sharedApplication] openURL:urlApp];
if(!worked){
NSURL *urlApp = [NSURL URLWithString: [NSString stringWithFormat:@"%@", @"https://twitter.com/#!/BryceOfLife"]];
[[UIApplication sharedApplication] openURL:urlApp];
}
}
}
@end
回答1:
A similar problem was faced by the person who asked this question.
When asked whether he was able to solve it, they said:
Yes, I did, there wasn't anything I could do about it from the scene or Sprite Kit for that matter, I simply needed to remove the scene and the view containing it completely from the parent view, cut all its bonds to the other parts of the system, in order for the memory to be deallocated as well.
You should use separate views for each of your scene and transition between these views. You can follow these steps to make it look natural:
1 - At the point you want to transition from one scene to the other, take a snapshot of the scene using the following code:
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, scale);
[self drawViewHierarchyInRect:self.bounds afterScreenUpdates:YES];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Then, add this image as a subview of the SKView of the current scene, and remove the scene.
2 - Initialise the new scene on another view, and transition between the two views using UIView animation.
3 - Remove the first view from it's superview.
回答2:
I am just starting out with SpriteKit in Swift and I had the same problem: My "intro" scene was playing some music that I wanted to stop after transitioning to the main menu scene, and I figured deinit would be a good place to put the AVAudioPlayer.stop call in, but the deinitializer was never being called.
After some looking around I learned that it may be because of some strong references to the scene, so I changed
let s = StartupScene(size: skView.bounds.size)
skView.presentScene(s)
to
skView.presentScene(StartupScene(size: skView.bounds.size))
in my GameViewController:UIViewController, and
let s = MainMenuScene(size: self.size)
let t = SKTransition.crossFadeWithDuration(1)
self.scene.view.presentScene(s, transition: t)
to
self.scene.view.presentScene(MainMenuScene(size: self.size), transition: SKTransition.crossFadeWithDuration(1))
in the scene that I wanted to deallocate, and it worked! After the transition was complete the deinit method got called.
Hopefully someone more experienced can edit this answer to better explain what exactly took place here.
回答3:
EDIT: My previous idea about an NSTimer was irrelevant
To make sure this is an issue isolated to this scene, override the dealloc methods of all scenes you might have (including this one) like this:
-(void)dealloc {
NSLog(@"Dealloc <scene name>");
}
Look at your other scene transitions, see if they deallocate properly. Find the differences between these scenes. This will help you see if it's an isolated issue or a bigger problem. Once you have the problem fixed be sure to comment out or remove the dealloc method as it is overriding the one that actually deallocates the memory. Hopefully this helps!
回答4:
There's nothing wrong with SKScene or SKView, as long as I can see. Make sure the scene instance is not strongly reference anywhere else, especially inside a block. Blocks are highly probable to be ignored.
More about weak reference inside a block: https://stackoverflow.com/a/17105368/571489
As far as I see, you do have a block strongly referencing the scene instance:
[SKTexture preloadTextures:to_preload withCompletionHandler:^{
[self fadeRemove:masterOverlay];
[self initialize];
}];
来源：https://stackoverflow.com/questions/22007391/deallocate-skscene-after-transition-to-another-skscene-in-spritekit