如何解决子类化NSObject时出错:“ EXC_BAD_ACCESS”
| 我正在尝试创建一个名为HighscoresController的类,该类将NSObject子类化。当我以下列方式调用init
方法时,调试器GDB: Program received signal: \"EXC_BAD_ACCESS\"
出现错误。有谁知道为什么吗?我完全陷入了困境。
// Initialize the highscores controller
_highscoresController = [[HighscoresController alloc] init];
这是我的课程实现:
#import \"HighscoresController.h\"
#import \"Constants.h\"
@implementation HighscoresController
@synthesize highscoresList = _highscoresList;
- (id) init {
self = [super init];
_highscoresList = [[NSMutableArray alloc] initWithCapacity:kHighscoresListLength];
int kMyListNumber = 0;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@\"highscores.plist\"];
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) { // if settings file exists
NSArray *HighscoresListOfLists = [[NSArray alloc] initWithContentsOfFile:filePath];
_highscoresList = [HighscoresListOfLists objectAtIndex:kMyListNumber];
[HighscoresListOfLists release];
} else { // if no highscores file,create a new one
NSMutableArray *array = [[NSMutableArray alloc] init];
[array addObject:_highscoresList];
[array writeToFile:filePath atomically:YES];
[array release];
}
[_highscoresList addObject:[NSNumber numberWithFloat:0.0f]];
return self;
}
- (void) addScore:(float)score {
// Implementation
}
- (BOOL) isScore:(float)score1 betterThan:(float)score2 {
if (score1 > score2)
return true;
else
return false;
}
- (BOOL) checkScoreAndAddToHighscoresList:(float)score {
NSLog(@\"%d\",[_highscoresList count]);
if ([_highscoresList count] < kHighscoresListLength) {
[self addScore:score];
[self saveHighscoresList];
return true;
} else {
NSNumber *lowScoreNumber = [_highscoresList objectAtIndex:[_highscoresList count]-1];
float lowScore = [lowScoreNumber floatValue];
if ([self isScore:score betterThan:lowScore]) {
[self addScore:score];
[self saveHighscoresList];
return true;
}
}
return false;
}
- (void) saveHighscoresList {
// Implementation
}
- (void) dealloc {
[_highscoresList release];
_highscoresList = nil;
[super dealloc];
}
@end
解决方法
这行有两个问题:
_highscoresList = [HighscoresListOfLists objectAtIndex:kMyListNumber];
您将丢失对该方法前面分配的数组的引用-内存泄漏。
您将其替换为对您不保留的对象的引用。在释放对象之后使用此方法肯定会导致您的错误访问异常。版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。