ios - What does @"//" do in childWithName and when to use it -

-

i'm working on spritekit project , skspritenode has simple name:

node.name = @"cat"

however, when try [self childwithname:@"cat"], not retrieve object. through research noticed people mentioning should doing

[self childwithname:@"//cat"]

and works. wondering having "//" does?

it doesn't special things nsstrings, strings used search node tree, recursively searches of self's children.

from documentation:

when placed @ start of search string, [//] specifies search should begin @ root node , performed recursively across entire node tree. not legal anywhere else in search string.

so, example, let's have node tree:

                 scene               /         \              /           \         child1              child2        /      \              /     \       /        \            /        \ grandchild1  grandchild2 grandchild3  grandchild4

without //, childnodewithname: find child1 or child2. //, find child1, child2, grandchild1, grandchild2, grandchild3, or grandchild4.


Comments

Post a Comment

Popular posts from this blog

swift - How to change text of a button with a segmented controller? -

-
i have button links view control. trying change text of button segmented control. using jared davidson tutorial on segmented controls changing text of labels . how change text of button? also, when attempted japanese characters, got error on line: "invalid character in source file". thank you! you can change button title japanese characters way: yourbutton.settitle("ボタンのタイトル", forstate: uicontrolstate.normal)
Read more

python - How to create jsonb index using GIN on SQLAlchemy? -

-
here's current code creating index jsonb. index("mytable_data_idx_id_key", mytable.data['id'].astext, postgresql_using='gin') but got error. sqlalchemy.exc.programmingerror: (psycopg2.programmingerror) data type text has no default operator class access method "gin" hint: must specify operator class index or define default operator class data type. [sql: "create index event_data_idx_id_key on event using gin ((data ->> 'id'))"] is there way create index on sqlalchemy? the postgresql specific sqlalchemy docs @ http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#operator-classes mention postgresql_ops dictionary provide "operator class" used postgresql, , provide example illustrating use: index('my_index', my_table.c.id, my_table.c.data, postgresql_ops={ 'data': 'text_pattern_ops', ...
Read more

PHP DOM loadHTML() method unusual warning -

-
i had following code works fine on localhost: $document = new domdocument(); $document->loadhtml($p_result); $form = $document->getelementsbytagname('form')->item(0); // code continues using $form variable after same code updated on outside server, loadhtml() failed , issued warning. warning: domdocument::loadhtml() expects parameter 1 valid path, string given in path/name/to/script.php returned null instead of object code pretty gets fatal error. note contents of $p_result absolutely same on outside server , on localhost. but why displays kind of warning , why not work? doesn't loadhtml() expects argument 1 string in first place? why method expects parameter 1 valid path ? just make clear i'm not calling loadhtmlfile() , i'm calling loadhtml() . thanks. you're affected one of php bugs . issue present in php 5.6.8 , 5.6.9. have affected php version on server, , bug-free version on localhost. the bug forbids null ...
Read more