uitableview - Iphone UITableViewCell CustomCell -

attempting implement "simple" customcell, have normal tableviewcontroller renders fine using normal "default" methods, need implement custom cell uilabel's , uiimage.

so created customcell.h, customcell.m, customcell.xib

the .h

@interface customcell : uitableviewcell <uitextviewdelegate> {     iboutlet uiimageview *image;     iboutlet uilabel *name;     iboutlet uilabel *date;     iboutlet uilabel *comment; }  @property (retain,nonatomic) iboutlet uiimageview *image; @property (retain,nonatomic) iboutlet uilabel *name; @property (retain,nonatomic) iboutlet uilabel *date; @property (retain,nonatomic) iboutlet uilabel *comment; 

and .m

@implementation customcell  @synthesize image; @synthesize name; @synthesize date; @synthesize comment;   #pragma mark - #pragma mark view lifecycle  - (id) initwithcontroller: (controller *) ctnlr  {     controllerpointer = ctnlr;     return(self); }  - (void) setimage:(uiimageview*)image {     image = image; }  - (void) setname:(nsstring*)name {     [name retain];     [name.text release];     name.text = name; }  - (void) setdate:(nsstring*)date {     [date retain];     [date.text release];     date.text = date; }  - (void) setcomment:(nsstring*)comment {     [comment retain];     [comment.text release];     comment.text = comment; } 

anyway, when attempt create these customcells in cellforrowatindexpath (as 1 expect might implemented) left blank screen. missing big... when created .xib file "interface builder" made sure connect "referencing outlets" appropriate labels , images.

so following implied logic of way xcode framework appears work, followed same reasoning (for lack of exact example) no worky... anyway, if there iphone geeks enlighten me... (yes, there no "[something release]" calls, not sure if needed alloc'd. please tell me there's couple calls leaving out, can't more simple right...?

- (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {      static nsstring *cellidentifier = @"cell";             customcell *cell = (customcell*)[tableview dequeuereusablecellwithidentifier:cellidentifier];      if(cell == nil)     {         cell = [[[nsbundle mainbundle] loadnibnamed:@"customcell" owner:self options:nil] lastobject];     }      nsuinteger row = [indexpath row];     snsobject *sobj = [snsarray objectatindex:row];      [cell setname:[sobj getusername]];      nsuinteger row = [indexpath row];     snsobject *sobj = [snsarray objectatindex:row];      cell.name = [[uilabel alloc]init];     cell.name.text = [sobj getusername];      cell.date = [[uilabel alloc]init];     cell.date.text = [sobj getdatetime];      cell.comment = [[uilabel alloc]init];     cell.comment.text = [sobj getcommenttext];      cell.image = [[uiimageview alloc]init];     cell.image.image = [sobj getimageurl];   return(cell) } 

thanks in advance!

there other issues code beyond mrcrowl mentioned needing "alloc-init" outlets. in particular, line:

cell = [[[nsbundle mainbundle] loadnibnamed:@"customcell" owner:self options:nil] lastobject]; 

this not typical idiom used load custom tableview cell .xib. first of all, pass "owner:self", means want hook outlet objects in .xib file outlet members in tableviewcontroller object, not intended. second, you're relying on order of objects returned loadnibnamed:owner:options:, while may work today, may not work tomorrow, or on new release of ios.

instead, usual idiom declare outlet entire tableviewcell in tableviewcontroller: (in .h file):

...    uitableviewcell *tvcell; ...  @property (nonatomic, retain) iboutlet uitableviewcell *tvcell; 

then in place of line, have this:

[[nsbundle mainbundle] loadnibnamed:@"newsarchivetitletvcell" owner:self options:nil]; cell = tvcell; self.tvcell = nil; 

normally isn't done subclassing, notice how didn't declare class customcell, vanilla uitableviewcell. how @ pesky subviews can configure them? using tags normal way:

... #define kmykewllabeltag 1 ...     uilabel *kewllabel = (uilabel *) [cell viewwithtag:kmykewllabeltag];     kewllabel.text = [nsstring stringwithformat:@"hi there row %d!", indexpath.row]; ... 

edit: edit: here's bit more detail, comments short address "what's going on here?" question. here's excerpt 1 of apps loads uitableviewcell .xib:

- (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {      static nsstring *cellidentifier = @"myshoppingcarttvcell";      uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:cellidentifier];     if (cell == nil)      {         [[nsbundle mainbundle] loadnibnamed:@"shoppingcarttvcell" owner:self options:nil];         cell = tvcell;         self.tvcell = nil;     }         ...         // (insert code grab model data row)         ...     uilabel *namelabel = (uilabel *) [cell viewwithtag:1];     namelabel.text = itemnamestr;      uilabel *countlabel = (uilabel *) [cell viewwithtag:2];     countlabel.text = [nsstring stringwithformat:@"%d", itemcount];      uiimageview *iv = (uiimageview *) [cell viewwithtag:3];         ... 

here's what's going on here:

• there no custom uitableviewcell subclass, there .xib file named "shoppingcarttvcell.xib" containing uitableviewcell, , ui elements placed inside uitableviewcell. ui elements data must change per row assigned unique tag (the tag field in cmd-1 attributes inspector in ib) code can handle objects change them (customize labels, images, etc). make sure don't use "0" since elements default have 0 tag. also, make sure identifier field of uitableviewcell in cmd-1 attributes inspector cellidentifier string.

• the file's owner of .xib file table view controller want display cell. more precisely, can class containing iboutlet uitableviewcell *tvcell; member. instance of class pass in owner loadnibnamed:owner:options:. long value of linked outlet nil in owner, when call loadnibnamed:owner:options, outlet of owner filled in object .xib (as long connection made in .xib in ib). understanding magic moment in apple programming opens whole new vistas :).

• you must set self.tvcell = nil; prepare next cellforrowatindexpath needs load .xib. set nil before loadnibnamed:owner:options:, think that's bit safer actually.

here's how go loading uitableviewcells .xib:

• in xcode, add iboutlet uitableviewcell *tvcell; uitableviewcontroller class (including property declaration if like)

• in xcode project, create new file, user interface, empty xib. open .xib in ib

• in ib, drag tableviewcell library empty .xib file under first responder

• click file's owner, cmd-4 (identify inspector), , under class select class containing iboutlet uitableviewcell *tvcell added (probably uitableviewcontroller subclass, class you're manipulating table).

• control-drag file's owner uitableviewcell, , select outlet want hook up. field hold newly-loaded-from-xib uitableviewcell when call loadnibnamed:owner:options instance of file's owner "owner" parameter.

• add ui elements uitableviewcell (make sure they're inside uitableviewcell hierarchy). elements want customize per-row require unique tag value.

• follow recipe gave above in cellforrowatindexpath

• have magic moment start understand how .xib files , file's owner objects work together, , start creating lots of cool uitableviewcells , other custom view objects in ib because it's easy , way better creating them in code (imnsho).