cocos2d-iphone sprite页面加载

Question

我在为我的游戏创建按钮类时遇到了问题。我的按钮图像在一个精灵工作表中，这是我在Zwoptex中创建的。问题是程序在加载精灵时崩溃。

这是Buttons.h：

#import "CommonProtocols.h"
#import "GameObject.h"


@interface Buttons : CCSprite
{
    CCSprite *buttonSprite;
    ButtonTypes *buttonType;
    CCSpriteBatchNode *buttonsNode;
}
+(id)button;
-(id)initButtonWithType:(ButtonTypes)bType;

@property (readwrite,assign)CCSpriteBatchNode* buttonsNode;
@property (readwrite,assign)CCSprite *buttonSprite;
@property (readonly)ButtonTypes *buttonType;
@end

下面是实现：

#import "Buttons.h"

@implementation Buttons
@synthesize buttonSprite;
@synthesize buttonsNode;
@synthesize buttonType;
-(void)dealloc
{
    [buttonSprite release];
    [super dealloc];
}
+(id)button
{
    return [[[self alloc] init] autorelease];
}


-(id)initButtonWithType:(ButtonTypes)btype 
{
    if(self=[super init]){

    buttonsNode = [CCSpriteBatchNode batchNodeWithFile:@"Buttons.png"];
    [[self parent] addChild:buttonsNode];

    [[CCSpriteFrameCache sharedSpriteFrameCache] addSpriteFramesWithFile:@"Buttons.plist"];

    switch (btype)
    {
        case kFireButton:
            [self setButtonSprite:[CCSprite spriteWithSpriteFrameName:@"firebutton.png"]];
            [buttonsNode addChild:[self buttonSprite]];
            return self;
            break;

        case kLeftButton:
            [self setButtonSprite:[CCSprite spriteWithSpriteFrameName:@"leftbutton.png"]];
            [buttonsNode addChild:[self buttonSprite]];
            return self;
            break;

        case kRightButton:
            [self setButtonSprite:[CCSprite spriteWithSpriteFrameName:@"rightbutton.png"]];
            [buttonsNode addChild:[self buttonSprite]];
            return self;
            break;

        case kReplayButton:
            [self setButtonSprite:[CCSprite spriteWithSpriteFrameName:@"replaybutton.png"]];
            [buttonsNode addChild:[self buttonSprite]];
            return self;
            break;


        default:
            NSLog(@"NO button");
            break;

        }

    }
return self;
}
@end

当我在别处调用此方法时，程序崩溃：

 Buttons *myButton = [[Buttons button] initButtonWithType:kFireButton];
        [self addChild:myButton];

下面是程序输出的内容：

cocos2d: CCSpriteFrameCache: Frame 'firebutton.png' not found

*** Assertion failure in +[CCSprite spriteWithSpriteFrameName:],

最后是Zwoptex生成的plist：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>frames</key>
    <dict>

        <key>firebutton.png</key>
        <dict>
            <key>aliases</key>
            <array>

            </array>
            <key>spriteColorRect</key>
            <string>{{1, 2}, {38, 40}}</string>
            <key>spriteOffset</key>
            <string>{0, 2}</string>
            <key>spriteSize</key>
            <string>{38, 40}</string>
            <key>spriteSourceSize</key>
            <string>{40, 48}</string>
            <key>spriteTrimmed</key>
            <true/>
            <key>textureRect</key>
            <string>{{51, 1}, {38, 40}}</string>
            <key>textureRotated</key>
            <false/>
        </dict>

        <key>leftbutton.png</key>
        <dict>
            <key>aliases</key>
            <array>

            </array>
            <key>spriteColorRect</key>
            <string>{{1, 0}, {46, 47}}</string>
            <key>spriteOffset</key>
            <string>{0, -0}</string>
            <key>spriteSize</key>
            <string>{46, 47}</string>
            <key>spriteSourceSize</key>
            <string>{48, 47}</string>
            <key>spriteTrimmed</key>
            <true/>
            <key>textureRect</key>
            <string>{{1, 52}, {46, 47}}</string>
            <key>textureRotated</key>
            <false/>
        </dict>

        <key>replaybutton.png</key>
        <dict>
            <key>aliases</key>
            <array>

            </array>
            <key>spriteColorRect</key>
            <string>{{1, 0}, {46, 47}}</string>
            <key>spriteOffset</key>
            <string>{0, -0}</string>
            <key>spriteSize</key>
            <string>{46, 47}</string>
            <key>spriteSourceSize</key>
            <string>{48, 47}</string>
            <key>spriteTrimmed</key>
            <true/>
            <key>textureRect</key>
            <string>{{49, 52}, {46, 47}}</string>
            <key>textureRotated</key>
            <false/>
        </dict>

        <key>rightbutton.png</key>
        <dict>
            <key>aliases</key>
            <array>

            </array>
            <key>spriteColorRect</key>
            <string>{{1, 0}, {46, 47}}</string>
            <key>spriteOffset</key>
            <string>{0, -0}</string>
            <key>spriteSize</key>
            <string>{46, 47}</string>
            <key>spriteSourceSize</key>
            <string>{48, 47}</string>
            <key>spriteTrimmed</key>
            <true/>
            <key>textureRect</key>
            <string>{{1, 1}, {48, 49}}</string>
            <key>textureRotated</key>
            <false/>
        </dict>

    </dict>
    <key>metadata</key>
    <dict>
        <key>version</key>
        <string>1.5.5</string>
        <key>format</key>
        <integer>3</integer>
        <key>size</key>
        <string>{128, 128}</string>
        <key>name</key>
        <string>Buttons</string>
        <key>premultipliedAlpha</key>
        <false/>
        <key>target</key>
        <dict>
            <key>name</key>
            <string>default</string>
            <key>textureFileName</key>
            <string>Buttons</string>
            <key>textureFileExtension</key>
            <string>.png</string>
            <key>coordinatesFileName</key>
            <string>Buttons</string>
            <key>coordinatesFileExtension</key>
            <string>.plist</string>
            <key>premultipliedAlpha</key>
            <false/>
        </dict>
    </dict>
</dict>
</plist>

Answer 1

嗯..。在我看来没问题。可能找不到.plist。验证.plist是否为目标的成员，以及资源目录中的文件名大小写是否正确。

另外，在这一行上：

[[self parent] addChild:buttonsNode];

不确定调用init方法时是否设置了父级。

编辑:在plist中添加精灵框架的行上放置一个断点。一直走到这里，在CCSpriteFrameCache的代码中：

-(void) addSpriteFramesWithFile:(NSString*)plist
{
    NSAssert(plist, @"plist filename should not be nil");

    if( ! [loadedFilenames_ member:plist] ) {

        NSString *path = [[CCFileUtils sharedFileUtils] fullPathFromRelativePath:plist];
        NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:path];

        NSString *texturePath = nil;
....

并验证dict是否为零。cocos2d用于静默加载目录的方法“失败”，即如果文件不存在，则返回nil Dictionary对象。如果文件存在，那么问题出在别的地方。如果dict为零，那么.继续查看项目设置，直到找到问题所在，要么是文件命名问题(注意project和finder中文件名的大小写:必须相同)，要么是文件不是目标的成员。另外，如果你为你的项目启用了HD，确保plist是“Buttons hd.plist”，纹理也是一样的(Buttons hd.png)。同样，CCSpriteBatchNode对丢失的纹理“什么也不做”，静默失败。