objective-c - 数组排序时内存泄漏

Question

我有以下功能

- (NSArray *) getUsers : (days) aDay {

    NSArray *arr = [[[NSArray alloc] init] autorelease];

    for (User *e in [week objectAtIndex:aDay]) {
        //Get distance to user
        e.place.distance = [[LocationManager sharedLocationManager] getDistanceWithLat:e.place.latitude Lon:e.place.longitude];
    }

    //Sort the array
    arr = [ [week objectAtIndex:aDay] sortedArrayUsingComparator:^(id obj1, id obj2){
            User *e1 = (User *)obj1;
            User *e2 = (User *)obj2;

            if (e1.place.distance <= e2.place.distance) {
                return (NSComparisonResult)NSOrderedAscending;
            } else {
                return (NSComparisonResult)NSOrderedDescending;
            }
        return (NSComparisonResult)NSOrderedSame;
    }];

    [arr retain];

    return arr;
}

它泄漏了，我不知道如何修复它。如果我删除 [arr retian] 那么应用程序崩溃。

当我执行操作配置文件时，仪器在此行显示 100% 泄漏:

   arr = [ [week objectAtIndex:aDay] sortedArrayUsingComparator:^(id obj1, id obj2){

如何修复此泄漏？

Answer 1

删除NSArray *arr = [[[NSArray alloc] init] autorelease];和[arr retain];根本不。在第一行中，您分配了内存，但是在排序时引用了新数组并发生了泄漏。

NSArray *arr = [ [week objectAtIndex:aDay] sortedArrayUsingComparator:^(id obj1, id obj2){
            User *e1 = (User *)obj1;
            User *e2 = (User *)obj2;

            if (e1.place.distance <= e2.place.distance) {
                return (NSComparisonResult)NSOrderedAscending;
            } else {
                return (NSComparisonResult)NSOrderedDescending;
            }
        return (NSComparisonResult)NSOrderedSame;
    }];

return arr;