iphone - Situation in which a hitTest-confirmed view with a gesture recognizer won't receive the event? -


`i've got view uiimageview subview. main view has single tap gesturerecognizer on works 99% of time.

every once in while, gesture recognizer seems fail, , event gets pushed stack next responder. i've added breakpoint in hittest method of top view, , hit test method correctly returns inner-most uiimageview in cases, including when event goes wrong place.

in situation view result of hittest not event passed gesture recognizer? i've printed out debug code hittest breakpoint when gesture selector doesn't called:

(lldb) po u $2 = 0x20854520 <uiimageview: 0x20854520; frame = (0 0; 61 62); opaque = no; layer = <calayer: 0x208e7670>>  (lldb) po [u superview] $0 = 0x1fd225e0 <hotspotview: 0x1fd225e0; frame = (303 663; 61 62); gesturerecognizers = <nsarray: 0x2082b850>; layer = <calayer: 0x1fd15af0>>  (lldb) po ((hotspotview *)u.superview).gesturerecognizers $1 = 0x208bc940 <__nsarrayi 0x208bc940>(     <uitapgesturerecognizer: 0x20828fa0; state = possible; cancelstouchesinview = no; delaystouchesended = no; view = <hotspotview 0x1fd225e0>; target= <(action=handlesingletap:, target=<hotspotview 0x1fd225e0>)>> )

u result of hit test (the uiimageview). u.superview container view has gesture recognizer attached it. so, here, confirm u.superview has gesture recognizer. shouldn't it, then, receive event? in situation event not make singletap , instead bubble next responder?

edit: i've managed capture problem again (xcode crashed last time had after few minutes...) , i've found touch makes way hotspotview. touchesbegan gets touch correctly if fails call gesture recognizer. i've logged touch , touch events both successful , unsuccessful taps (in terms of whether call gr or not) , appear identical.

so, i'm more lost.

1) right object returned hit test
2) right object receives touchesbegan call
3) object has gesture recognizer
4) , yet, sometimes, gesture recognizer not called (with no reliability , difficult reproduction).

my guess in situations gesture recognizer not recognize, gesture not qualifying tap. if accidentally tap twice in succession, example, or hold down long, or slide finger little, gesture might not seem single tap gesture recognizer.

in other words, keep in mind touch not gesture. doing nice logging shows structure is, , you've shown recent touch on uiimageview, not mean gesture recognizer recognized tap. there might other conflicting gesture recognizers, or gesture might not seem tap.

by way, doing odd thing here. hotspotview same size uiimageview. seems purpose detect tap. have done uiimageview alone. why not keep simple? set userinteractionenabled of uiimageview , attach tap gesture recognizer uiimageview itself.


Comments

Post a Comment

Popular posts from this blog

c# - DetailsView in ASP.Net - How to add another column on the side/add a control in each row? -

i have detailsview control on page used edit various fields of record, works in respect. i looking way add 1 column (and if works, why not more) right, absolutely read-only, show same fields of record comparison purposes. i aware there no obvious way such thing out of box detailsview . have looked other controls (transposed gridview , recommended formview , listview ), nothing satisfies. have special data binding setup using detailsview , can't out of without losing features. anyone on how "hack in" additional columns (for display only) on detailsview ? the solution have now, use second detailsview , visible set false in aspx. in code, make sure databind hidden detailsview hosts data third column first, initial detailsview named itemdetails . and in item created event, pass third column html rendering of hidden controls (in last code block) : protected void itemdetails_itemcreated(object sender, eventargs e) { if (dataite
Read more

javascript - firefox memory leak -

i have following script (i use raphaeljs also) draws circle, waits 1 second, draws circle again, etc (you can copy paste - functional, need include raphael raphaeljs.com): <div id="holder"> </div> <script src="raphael.js" type="text/javascript"></script> <script> var paper = raphael(10, 50, 320, 200); var rad = math.pi / 180; var finangle = 0; function sector(cx, cy, r, startangle, endangle, params) { var x1 = cx + r * math.cos(-startangle * rad), x2 = cx + r * math.cos(-endangle * rad), y1 = cy + r * math.sin(-startangle * rad), y2 = cy + r * math.sin(-endangle * rad); return ["m", cx, cy, "l", x1, y1, "a", r, r, 0, +(endangle - startangle > 180), 0, x2, y2]; } var path = sector(100,100,50,0,180); var arc = paper.path(path); function draw() { path = sector(100,100,50,0,finangle);
Read more

Trying to import CSV file to a SQL Server database using asp.net and c# - can't find what I'm missing -

i student , quite new programming, , given task using asp.net , c#, without being taught either. plan learn teach ourselves. the task stuck on making website import csv file sql server database of last year's room bookings around campus. the table has following columns: request_id; priority; module_id; day; start_time; length; park; students; room_code; status; semester_id; linked_request; week_1; week_2; week_3; week_4; week_5; week_6; week_7; week_8; week_9; week_10; week_11; week_12; week_13; week_14; week_15; ) in code, try make work 3 columns (request_id,priority,module) starters. when press import button, want read .csv file (with fixed name @ fixed directory) eg "1,2,3" - comma separating fields [delimiter] - , import sql server datab
Read more