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我想從plist文件中加載一些數據。它包含一個非常少數據NSDictionaries的NSArray（一個非常短的字符串和一個數字）。問題是它有大約8000個條目。當存儲爲XML時，plist文件本身約爲900 kB，當以二進制形式存儲時約爲350 kB，但顯然當它被加載到內存時，它會擴展到大約510 MB，這似乎是使用分配分析器發生的情況。這就像磁盤大小的50-60k倍。帶有一系列字典的plist文件的內存開銷是多少？
起初我以爲肯定有某種錯誤，但後來我意識到我對可可的東西的內存開銷知之甚少。無論如何。我加載plist中是這樣的：
NSMutableArray *data = [[NSMutableArray alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"localita" ofType:@"plist"]];
然後我把它分配給該自定義視圖控制器的屬性（非原子，強）我有
[cbVC setData:data];
[cbVC setFilteredData:data];
我之前重寫使用setData但我改通過這種方式來看看這是否是一個問題 - 事實並非如此。所以，這就是接口：
@protocol CityBrowserDelegate <NSObject>
- (void)cityPicked:(NSString *)cityName;
@end
@interface CityBrowserViewController : UIViewController <UITableViewDelegate, UISearchBarDelegate, UISearchDisplayDelegate>
- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope;
- (IBAction)selectionFinished:(id)sender;
@property (nonatomic, strong) NSMutableArray *data;
@property (nonatomic, strong) NSMutableArray *filteredData;
@property (nonatomic, strong) IBOutlet UITableView *tableView;
@property (nonatomic, strong) IBOutlet id<MyPopoverControllerDelegate, CityBrowserDelegate> delegate;
@end
，這是實現（我去掉了不相關的部分）
@implementation CityBrowserViewController
@synthesize data = _data;
@synthesize filteredData = _filteredData;
@synthesize tableView = _tableView;
@synthesize delegate = _delegate;
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return [self.filteredData count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [self.filteredData count] == 0 ? 1 : [self.filteredData count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellID = @"BasicCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
if(!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
}
if([self.filteredData count] == 0) {
[cell.textLabel setText:@"Nessun risultato"];
} else {
[cell.textLabel setText:[[self.filteredData objectAtIndex:indexPath.row] valueForKey:@"Name"]];
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *name = [[self.filteredData objectAtIndex:indexPath.row] valueForKey:@"Name"];
[self.delegate cityPicked:name];
}
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
[self filterContentForSearchText:searchString scope:[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];
// Return YES to cause the search result table view to be reloaded.
return YES;
}
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption {
[self filterContentForSearchText:[self.searchDisplayController.searchBar text] scope:[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:searchOption]];
// Return YES to cause the search result table view to be reloaded.
return YES;
}
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar {
_filteredData = _data;
}
- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope {
[_filteredData removeAllObjects]; // First clear the filtered array.
// YES, I KNOW, but it seems to be quite fast nonetheless...
NSDictionary *city;
for (city in _data) {
NSString *cityName = [city valueForKey:@"Name"];
NSComparisonResult result = [cityName compare:searchText options:NSCaseInsensitiveSearch range:NSMakeRange(0, [searchText length])];
if (result == NSOrderedSame) {
[_filteredData addObject:city];
}
}
}
- (void)selectionFinished:(id)sender {
[self.delegate dismissPopover];
}
@end
現在：爲什麼我收到510 MB內存的任何線索分配，當我加載plist？顯然它不會被取消分配，當我取消搜索並恢復原始數據在searchBarCancelButtonClicked ...