SpriteKit view throwing NSInvalidArgumentException

问题

I have this code below that loads a scene in the viewDidLoad: method.

SKView *spriteView = (SKView *) self.view;
spriteView.showsDrawCount = YES;
spriteView.showsNodeCount = YES;
spriteView.showsFPS = YES;
PFPiePlanesScene *scene = [PFPiePlanesScene sceneWithSize:self.view.frame.size];
scene.scaleMode = SKSceneScaleModeAspectFill;
[spriteView presentScene:scene];

When I call anything on the spriteView, it crashes with this message:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView setShowsDrawCount:]: unrecognized selector sent to instance 0x9685030'

I assume this is because it is not treating the instance as a SKView and instead as a UIView.

Thanks in advance.

Some extra:

Sprite kit uses this code to load a scene.

// Configure the view.
SKView * skView = (SKView *)self.view;
skView.showsFPS = NO;
skView.showsNodeCount = NO;

// Create and configure the scene.
self.scene = [SKMyScene sceneWithSize:skView.bounds.size];
self.scene.scaleMode = SKSceneScaleModeAspectFill;

// Present the scene.
[skView presentScene:self.scene];

And, with no error. The classes are the exact same. Would just coming into the view screw this up?

Joe

回答1:

self.view is a UIView object. Simply casting the pointer does not make it a different type of object.

SKView *spriteView = (SKView *) self.view;

spriteView is now pointing to the object, that self.view is pointing to, telling the compiler, that it actually points to an object of type SKView. That's why you don't get any compiler errors or warnings. At runtime you are sending messages that can't be handled by spriteView because it is still just a UIView object.

回答2:

If you are following apple's walk-thougrh you skipped the part : "Open the storyboard for the project. It has a single view controller (SpriteViewController). Select the view controller’s view object and change its class to SKView.

回答3:

Don't forget add SpriteKit.framework under Linked Frameworks and Libraries.

Cheers, Jesse

回答4:

what you have to do is to change the subclass of view from UIView To SKView select ur viewcontroller under that view and change it subclass

回答5:

@Sebastian is not correct.

i guess you are following apple's walk-thougrh. maybe the following tutorial will help:

http://www.raywenderlich.com/49625/sprite-kit-tutorial-space-shooter

回答6:

Before casting your UIView to SKView , you must make sure to set your custom class as SKView in your storyboard.

回答7:

If you notice the first view controller comes with these imports in the header file.

 #import <UIKit/UIKit.h>

#import <SpriteKit/SpriteKit.h>

When you create a new view controller, by default Spritekit is not included. After adding sprite kit it should work with the default code apple provides

来源：https://stackoverflow.com/questions/20277246/spritekit-view-throwing-nsinvalidargumentexception

标签

ios

objective-c

sprite-kit