Iphone 在MKMapView中对注释执行操作时发生泄漏
我有一个方法，它接收要在地图视图上显示的注释（自定义PostLocationAnnotation类），并将它们聚集在一起，输出PostLocationAnnotations和LocationGroupAnnotations（每个集群都包含一些PostLocationAnnotations）的MKAnnotation数组。下面是我调用函数的方式（在“updateAnnotations”方法中，当地图的视口更改时调用该方法）： annotationsToAdd最初由从服务器检索到但尚未添加到地图的注释填充。因此，我将把应该放在地图上的注释的完整列表传递到clusterAnnotations方法中。以下是该方法的主体：Iphone 在MKMapView中对注释执行操作时发生泄漏,iphone,objective-c,mkannotation,nszombie,nsmutableset,Iphone,Objective C,Mkannotation,Nszombie,Nsmutableset,我有一个方法，它接收要在地图视图上显示的注释（自定义PostLocationAnnotation类），并将它们聚集在一起，输出PostLocationAnnotations和LocationGroupAnnotations（每个集群都包含一些PostLocationAnnotations）的MKAnnotation数组。下面是我调用函数的方式（在“updateAnnotations”方法中，当地图的视口更改时调用该方法）： annotationsToAdd最初由从服务器检索到但尚未添加到地图的注
- (NSArray *)clusterAnnotations:(NSArray *)annotations WithEpsilon:(float)eps andMinPts:(int)minPts
{
NSMutableSet *D = [[NSMutableSet alloc] initWithCapacity:[annotations count]];
NSMutableArray *C = [[NSMutableArray alloc] init];
for (id <MKAnnotation> annotation in annotations)
{
if ([annotation isKindOfClass:[PostLocationAnnotation class]])
{
NSMutableDictionary *dictEntry = [NSMutableDictionary dictionaryWithObjectsAndKeys:
annotation, @"point",
[NSNumber numberWithBool:NO], @"visited",
[NSNumber numberWithBool:NO], @"noise",
[NSNumber numberWithBool:NO], @"clustered", nil];
[D addObject:dictEntry];
[dictEntry release];
} else if ([annotation isKindOfClass:[LocationGroupAnnotation class]])
{
for (PostLocationAnnotation *location in [(LocationGroupAnnotation *)annotation locations])
{
NSMutableDictionary *dictEntry = [NSMutableDictionary dictionaryWithObjectsAndKeys:
location, @"point",
[NSNumber numberWithBool:NO], @"visited",
[NSNumber numberWithBool:NO], @"noise",
[NSNumber numberWithBool:NO], @"clustered", nil];
[D addObject:dictEntry];
[dictEntry release];
}
}
}
for (NSMutableDictionary *P in D)
{
if ([P objectForKey:@"visited"] == [NSNumber numberWithBool:NO])
{
[P setValue:[NSNumber numberWithBool:YES] forKey:@"visited"];
NSMutableSet *N = [[NSMutableSet alloc] initWithSet:[self regionQueryForPoint:P andEpsilon:eps fromList:D]];
if ([N count] < minPts)
{
[P setValue:[NSNumber numberWithBool:YES] forKey:@"noise"];
} else {
LocationGroupAnnotation *newCluster = [[LocationGroupAnnotation alloc] initWithLocations:nil];
[C addObject:newCluster];
[self expandDbscanClusterWithPoint:P andRegion:N andCluster:newCluster andEpsilon:eps andMinPts:minPts fromList:D];
[newCluster release];
}
[N release];
}
}
NSMutableArray *annotationsToAdd = [[[NSMutableArray alloc] initWithCapacity:[annotations count]] autorelease];
for (NSMutableDictionary *P in D)
{
if ([P objectForKey:@"clustered"] == [NSNumber numberWithBool:NO])
{
[annotationsToAdd addObject:[P objectForKey:@"point"]];
}
}
for (LocationGroupAnnotation *cluster in C)
{
[cluster updateCenterCoordinate];
}
[annotationsToAdd addObjectsFromArray:(NSArray *)C];
[D release];
[C release];
return (NSArray *)annotationsToAdd;
}
多年来我一直在分析这个问题，计算引用，观察指针等等，但我就是不知道如何安全地释放这个D集。有人能看到我看不到的东西吗？你似乎用
[dictEntry release]过度发布了dictEntry
。当使用带有ObjectsSandKeys的字典时，您将获得一个自动释放的对象。因此，再次释放它将减少保留计数
编辑：如果您不确定它的工作原理以及实际保留对象的时间，您可能需要查看：
使用名称以“alloc”开头的方法创建对象，
“新建”、“复制”或“可变复制”（例如，alloc、newObject或
可变副本）
您似乎过度发布了dictEntry
，而[dictEntry release]。当使用带有ObjectsSandKeys的字典时，您将获得一个自动释放的对象。因此，再次释放它将减少保留计数
编辑：如果您不确定它的工作原理以及实际保留对象的时间，您可能需要查看：
使用名称以“alloc”开头的方法创建对象，
“新建”、“复制”或“可变复制”（例如，alloc、newObject或
可变副本）
- (NSArray *)clusterAnnotations:(NSArray *)annotations WithEpsilon:(float)eps andMinPts:(int)minPts
{
NSMutableSet *D = [[NSMutableSet alloc] initWithCapacity:[annotations count]];
NSMutableArray *C = [[NSMutableArray alloc] init];
for (id <MKAnnotation> annotation in annotations)
{
if ([annotation isKindOfClass:[PostLocationAnnotation class]])
{
NSMutableDictionary *dictEntry = [NSMutableDictionary dictionaryWithObjectsAndKeys:
annotation, @"point",
[NSNumber numberWithBool:NO], @"visited",
[NSNumber numberWithBool:NO], @"noise",
[NSNumber numberWithBool:NO], @"clustered", nil];
[D addObject:dictEntry];
[dictEntry release];
} else if ([annotation isKindOfClass:[LocationGroupAnnotation class]])
{
for (PostLocationAnnotation *location in [(LocationGroupAnnotation *)annotation locations])
{
NSMutableDictionary *dictEntry = [NSMutableDictionary dictionaryWithObjectsAndKeys:
location, @"point",
[NSNumber numberWithBool:NO], @"visited",
[NSNumber numberWithBool:NO], @"noise",
[NSNumber numberWithBool:NO], @"clustered", nil];
[D addObject:dictEntry];
[dictEntry release];
}
}
}
for (NSMutableDictionary *P in D)
{
if ([P objectForKey:@"visited"] == [NSNumber numberWithBool:NO])
{
[P setValue:[NSNumber numberWithBool:YES] forKey:@"visited"];
NSMutableSet *N = [[NSMutableSet alloc] initWithSet:[self regionQueryForPoint:P andEpsilon:eps fromList:D]];
if ([N count] < minPts)
{
[P setValue:[NSNumber numberWithBool:YES] forKey:@"noise"];
} else {
LocationGroupAnnotation *newCluster = [[LocationGroupAnnotation alloc] initWithLocations:nil];
[C addObject:newCluster];
[self expandDbscanClusterWithPoint:P andRegion:N andCluster:newCluster andEpsilon:eps andMinPts:minPts fromList:D];
[newCluster release];
}
[N release];
}
}
NSMutableArray *annotationsToAdd = [[[NSMutableArray alloc] initWithCapacity:[annotations count]] autorelease];
for (NSMutableDictionary *P in D)
{
if ([P objectForKey:@"clustered"] == [NSNumber numberWithBool:NO])
{
[annotationsToAdd addObject:[P objectForKey:@"point"]];
}
}
for (LocationGroupAnnotation *cluster in C)
{
[cluster updateCenterCoordinate];
}
[annotationsToAdd addObjectsFromArray:(NSArray *)C];
[D release];
[C release];
return (NSArray *)annotationsToAdd;
}
- (NSSet *)regionQueryForPoint:(NSMutableDictionary *)P andEpsilon:(float)eps fromList:(NSMutableSet *)D
{
NSMutableSet *N = [[[NSMutableSet alloc] init] autorelease];
for (NSMutableDictionary *dictEntry in D)
{
if ((dictEntry != P) &&
([[dictEntry objectForKey:@"point"] isKindOfClass:[PostLocationAnnotation class]]))
{
CGPoint p1 = [ffMapView convertCoordinate:[[P objectForKey:@"point"] coordinate] toPointToView:self.view];
CGPoint p2 = [ffMapView convertCoordinate:[[dictEntry objectForKey:@"point"] coordinate] toPointToView:self.view];
float dX = p1.x - p2.x;
float dY = p1.y - p2.y;
if (sqrt(pow(dX,2)+pow(dY,2)) < eps)
{
[N addObject:dictEntry];
}
}
}
return (NSSet *)N;
}
- (void)expandDbscanClusterWithPoint:(NSMutableDictionary *)P andRegion:(NSMutableSet *)N
andCluster:(LocationGroupAnnotation *)cluster
andEpsilon:(float)eps
andMinPts:(int)minPts
fromList:(NSMutableSet *)D
{
[cluster addAnnotation:(PostLocationAnnotation *)[P objectForKey:@"point"]];
[P setValue:[NSNumber numberWithBool:YES] forKey:@"clustered"];
BOOL finished = NO;
while (!finished)
{
finished = YES;
for (NSMutableDictionary *nextP in N)
{
if ([nextP objectForKey:@"visited"] == [NSNumber numberWithBool:NO])
{
[nextP setValue:[NSNumber numberWithBool:YES] forKey:@"visited"];
NSSet *nextN = [self regionQueryForPoint:nextP andEpsilon:eps fromList:D];
if ([nextN count] >= minPts)
{
[N unionSet:nextN];
finished = NO;
break;
}
}
if ([nextP objectForKey:@"clustered"] == [NSNumber numberWithBool:NO])
{
[cluster addAnnotation:[nextP objectForKey:@"point"]];
[nextP setValue:[NSNumber numberWithBool:YES] forKey:@"clustered"];
}
}
}
}