iphone - Problems passing info via prepareForSegue, I cant figure it out -


i have asked question perhaps not clear enough did not responses... anyway here second attempt answer.

i have simple app has 2 views, each view has it's class set in storyboard specific classname.

  1. main view (mainviewcontroller)
  2. clientdetailview (clientdetailviewcontroller)

in main view have list displays list of "clients" list of email addresses. when click on email want transition second view email of row in list clicked.

on clientdetail view have property setup accept email address called key. assuming there no error assign key text uilabel can see right data passed.

ok time code.

here prepareforsegue method, can see comments because have been trying different things...

- (void)prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender {     if ([segue.identifier isequaltostring:@"showclientdetail"]) {         nsindexpath *indexpath = [self.tableview indexpathforselectedrow];         clientdetailviewcontroller *destviewcontroller = (clientdetailviewcontroller *)segue.destinationviewcontroller;         //destviewcontroller.key = [self.clients objectatindex:indexpath.row];         [destviewcontroller setkey:[self.clients objectatindex:indexpath.row]];     } }

here output when exception thrown

2013-05-21 13:56:50.484 clientmanager[19728:11603] -[nsmanagedobject isequaltostring:]: unrecognized selector sent instance 0x8624f90 2013-05-21 13:56:50.485 clientmanager[19728:11603] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[nsmanagedobject isequaltostring:]: unrecognized selector sent instance 0x8624f90' *** first throw call stack: (0x1fa4012 0x13e1e7e 0x202f4bd 0x1f93bbc 0x1f9394e 0x1764af 0x176674 0x5871 0xfe817 0xfe882 0xfeb2a 0x115ef5 0x115fdb 0x116286 0x116381 0x116eab 0x1174a3 0x117098 0x472da3 0x464ad9 0x464b54 0xcc899 0xccb3d 0xad3e83 0x1f63376 0x1f62e06 0x1f4aa82 0x1f49f44 0x1f49e1b 0x1efe7e3 0x1efe668 0x1d65c 0x1e2d 0x1d55) libc++abi.dylib: terminate called throwing exception

i have read & re read tutorials, stack trace , cannot figure out. pretty new ios dev , appreciate experts out there.

if haven't posted enough info please not down vote post or insult me, said new let me know add solution.

thanks

-------------update---------------

ok after advice ran in debugger

p (char*)object_getclassname(self.clients[0])

and looks part of problem when call setkey referenceing object nsmanagedobjec_client, make sense why failing.

from here not sure how property of object set key with.

here have in mainviewcontroller.m

@property (strong) nsmutablearray *clients;  - (void)viewdidload {     [super viewdidload];          // fetch devices persistent data store     nsmanagedobjectcontext *managedobjectcontext = [self managedobjectcontext];     nsfetchrequest *fetchrequest = [[nsfetchrequest alloc] initwithentityname:@"client"];     self.clients = [[managedobjectcontext executefetchrequest:fetchrequest error:nil] mutablecopy];      [self.tableview reloaddata];  }

so based on assume need somehow cast nsmanagedobject_client_ , emailaddress property. sound right? how do it?

it looks clients array doesn't contains nsstrings, nsmanageobjects. can verify adding breakpoint right before [destviewcontroller setkey:...] , running p (char*)object_getclassname(self.clients[0]) in debugger.


Comments

Post a Comment

Popular posts from this blog

python - How to create a legend for 3D bar in matplotlib? -

Image
given ax = plt.subplot() : ax.bar()[0] can passed plt.legend() . however, ax.bar3d() returns none . how create legend displayed bars? update: passing legend="stuff" ax.bar3d() , calling ax.legend() raises /usr/lib/python2.6/site-packages/matplotlib/axes.py:4368: userwarning: no labeled objects found. use label='...' kwarg on individual plots. warnings.warn("no labeled objects found. " you need use proxy artist legends not supported. this code: from mpl_toolkits.mplot3d import axes3d import matplotlib.pyplot plt import numpy np fig = plt.figure() ax = fig.add_subplot(111, projection='3d') x, y = np.random.rand(2, 100) * 4 hist, xedges, yedges = np.histogram2d(x, y, bins=4) elements = (len(xedges) - 1) * (len(yedges) - 1) xpos, ypos = np.meshgrid(xedges[:-1]+0.25, yedges[:-1]+0.25) xpos = xpos.flatten() ypos = ypos.flatten() zpos = np.zeros(elements) dx = 0.5 * np.ones_like(zpos) dy = dx.copy() dz = hist.flatten() ax...
Read more

java - Multi-Label Document Classification -

i have database in store data based upon following 3 fields: id, text, {labels}. note each text has been assigned more 1 label \ tag \ class. want build model (weka \ rapidminer \ mahout) able recommend \ classify bunch of labels \ tags \ classes given text. i have heard svm , naive bayes classifier, not sure whether support multi-label classification or not. guides me right direction more welcome! the basic multilabel classification method one-vs.-the-rest (ovr), called binary relevance (br). basic idea take off-the-shelf binary classifier, such naive bayes or svm, create k instances of solve k independent classification problems. in python-like pseudocode: for each class k: learner = svm(settings) # example labels = [class_of(x) == k x in samples] learner.learn(samples, labels) then @ prediction time, run each of binary classifiers on sample , collect labels predict positive. (both training , prediction can done in parallel, since problems assumed ...
Read more

php - Dynamic url re-writing using htaccess -

how can rewrite http://mydomain.com/test/master.php?catid=2&subcatid=8 http://mydomain.com/test/master.php/catname/subcat using .htaccess file. once rewritten, how can access these parameters in master.php? note: untested, let me know if doesn't work. rewriterule ^master.php/([a-za-z0-9_-]+)/([a-za-z0-9_-]+)$ /master.php?catid$1&subcatid=$2 [l]
Read more