IOS - IB : using UITableView in UIViewcontroller, please help me - ios

Question

im newbie IOS and using IB, im working UITableView in UIViewController, i have implement "UITableViewDelegate, UITableViewDataSource" in viewcontroller and setdelegate,datasource for uitableview but it dosen't work, i dont know,
please help me!
thank for your read this article.
code viewcontroller.h
#interface ViewController : UIViewController<UITableViewDelegate,
UITableViewDataSource> #property (nonatomic, retain) IBOutlet UITableView *tableView;
code viewcontroller.m
- (void)viewDidLoad { [tableView setDataSource:self];
[tableView setDelegate:self];
dispatch_async(htvque, ^{
NSData* data = [NSData dataWithContentsOfURL: listFilmByCate];
NSError* error;
jsonTable = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
listDataTable = [jsonTable objectForKey:#"List"];
dispatch_async(dispatch_get_main_queue(), ^{
[tableView reloadData];
});
});
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return listDataTable.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSDictionary *dataTable = [listDataTable objectAtIndex:indexPath.row];
NSData *receivedData = [NSData dataWithContentsOfURL:[NSURL URLWithString:[[dataTable objectForKey:#"Thumbnail"]objectForKey:#"Url1"]]]; UIImage *image = [[[UIImage alloc] initWithData:receivedData] stretchableImageWithLeftCapWidth:50 topCapHeight:80];
static NSString *simple_cell = #"simpleCell";
CustomizeCell_Home *customize_cell = (CustomizeCell_Home *)[tableView dequeueReusableCellWithIdentifier:simple_cell];
if (simple_cell == nil)
{}
customize_cell.imageView.image = image;
customize_cell.lbldescription.text =[dataTable objectForKey:#"LongDescription"];
customize_cell.lblTitle.text = [dataTable objectForKey:#"VName"];
customize_cell.lblTitle.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.numberOfLines=4;
customize_cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"bgtblRight.png"]];
return customize_cell;
}

Answer 1

in this line of code is your problem:
CustomizeCell_Home *customize_cell = (CustomizeCell_Home *)[tableView dequeueReusableCellWithIdentifier:simple_cell];
if (simple_cell == nil)
{}
what would happens if customize_cell is nil?
you are not instanciating the customize_cell and because of that you cant call these methods:
customize_cell.imageView.image = image;
customize_cell.lbldescription.text =[dataTable objectForKey:#"LongDescription"];
customize_cell.lblTitle.text = [dataTable objectForKey:#"VName"];
customize_cell.lblTitle.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.numberOfLines=4;
customize_cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"bgtblRight.png"]];
return customize_cell;
just add a simple inicialize cell inside the if, like this:
if (customize_cell == nil)
{
customize_cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:#"AnIdentifierString"] autorelease];
}
EDIT
change this:
CustomizeCell_Home *customize_cell = (CustomizeCell_Home *)[tableView dequeueReusableCellWithIdentifier:simple_cell];
if (simple_cell == nil)
{}
customize_cell.lbldescription.text =[dataTable objectForKey:#"LongDescription"];
customize_cell.lblTitle.text = [dataTable objectForKey:#"VName"];
customize_cell.lblTitle.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.numberOfLines=4;
customize_cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"bgtblRight.png"]];
return customize_cell;
to:
CustomizeCell_Home *customize_cell = (CustomizeCell_Home *)[tableView dequeueReusableCellWithIdentifier:simple_cell];
if (customize_cell == nil)
{
customize_cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:#"AnIdentifierString"] autorelease];
}
customize_cell.lbldescription.text =[dataTable objectForKey:#"LongDescription"];
customize_cell.lblTitle.text = [dataTable objectForKey:#"VName"];
customize_cell.lblTitle.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.lineBreakMode = UILineBreakModeWordWrap | UILineBreakModeTailTruncation;
customize_cell.lbldescription.numberOfLines=4;
customize_cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"bgtblRight.png"]];
return customize_cell;

Answer 2

Set,
tableView. dataSource = self;
tableView. delegate = self;
Implement protocol which are directed as #required means to say mandatory
-(UITableViewCell*) tableView: (UITableView *) tableView cellForRowAtIndexPath: (NSIndexPath *) indexPath
{
// dint concentrate on this part, hope u are right
NSDictionary *dataTable = [listDataTable objectAtIndex:indexPath.row];
NSData *receivedData = [NSData dataWithContentsOfURL:[NSURL URLWithString:[[dataTable objectForKey:#"Thumbnail"]objectForKey:#"Url1"]]];
UIImage *image = [[[UIImage alloc] initWithData:receivedData] stretchableImageWithLeftCapWidth:50 topCapHeight:80];
static NSString *simple_cell = #"simpleCell";
// works like double ended queue.... cells are re-used when available... so when cell is nil, u need to create
CustomizeCell_Home *customize_cell = (CustomizeCell_Home *)[tableView dequeueReusableCellWithIdentifier:simple_cell];
if (simple_cell == nil)
{
// CustomizeCell_Home is linked to CustomizeCell_Home_Reference using nib,
[[NSBundle mainBundle] loadNibNamed: #"CustomizeCell_Home" owner: self options: nil];
customize_cell = CustomizeCell_Home_Reference;
}
.....
.....
return customize_cell;
}

Answer 3

First thing, the cells are never allocated, instead of doing if(simple_cell==nil), you should do if(customize_cell==nil) and do the initialization code there. Otherwise you're comparing a string that you just created and set a value to against nil.