我有这个方法来处理几个我似乎无法正确处理的数组。与alloc和init相关的东西。
- (void)addBookmark
{
// Get the user defaults object
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
// Load your bookmarks (editable array)
NSMutableArray *bookmarks = [[NSMutableArray alloc]init];
NSArray *bookmarksLoaded = [userDefaults arrayForKey:@"bookmarks"];
if (bookmarksLoaded != nil) {
[bookmarks initWithArray:bookmarksLoaded];
} else {
[bookmarks init];
}
// Add a bookmark
NSMutableDictionary *bookmark = [NSMutableDictionary new];
[bookmark setValue:@"value" forKey:@"name"];
[bookmark setValue:@"value" forKey:@"description"];
[bookmark setValue:@"value" forKey:@"code"];
[bookmarks addObject:bookmark];
// Save your (updated) bookmarks
[userDefaults setObject:bookmarks forKey:@"bookmarks"];
[userDefaults synchronize];
// Memory cleanup
[bookmarks release];
}
最佳答案
你是对的 - 这是你对 alloc/init 的使用。您应该只init
一个对象一次。你想要这样的东西:
// Load your bookmarks (editable array)
NSMutableArray *bookmarks = nil; // we'll initialize it later
NSArray *bookmarksLoaded = [userDefaults arrayForKey:@"bookmarks"];
if (bookmarksLoaded) { // shortcut for bookmarksLoaded != nil
bookmarks = [[NSMutableArray alloc] initWithArray:bookmarksLoaded];
} else {
bookmarks = [[NSMutableArray alloc] init];
}
// Add a bookmark
NSMutableDictionary *bookmark = [NSMutableDictionary dictionary];
如果您使用dictionary
而不是new
,您将获得一个无需担心的自动释放对象(new
不是' t 用于 cocoa )。正如你所拥有的那样,你正在泄漏内存。
关于ios - NSMutableArray Init 的麻烦,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7103154/