Add a UITableView to an existing ViewController - ios

Question

I'm trying to add a UITableView to an existing UIViewController programmatically.
My run.h file has this:
#interface runTests : UIViewController <UINavigationControllerDelegate,UITextFieldDelegate,UIAlertViewDelegate,UITableViewDelegate,UITableViewDataSource> {NSTimer *Timer;}
#property (strong, nonatomic) UITableView *tableView;
My app runs through a speed test and at the end of the test I'm trying to add a TableView to the View. At the moment I have this:
-(void)addSpeedTable {
self.tableView = [[UITableView alloc] initWithFrame:self.view.bounds];
self.tableView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
self.tableView.rowHeight = 45;
self.tableView.sectionFooterHeight = 22;
self.tableView.sectionHeaderHeight = 22;
self.tableView.delegate = self;
self.tableView.dataSource = self;
[self.view addSubview:self.tableView];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;
{
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"newCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
}
cell.textLabel.text = #"Testing";
return cell;
}
The app never makes it into the cellForRowAtIndexPath method but does make it into the other two above. I can't see any error in the Xcode output.
Anything I need to be doing here:
When the app fails all I get is this:

Answer 1

If width of UITableView is zero, it will never call datasource
So change your code like this
self.tableView = [[UITableView alloc] initWithFrame:self.view.bounds];
self.tableView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
Good luck!

Answer 2

You should init your UITableView with a frame (and optionally a style), or at least define the frame somewhere.
For example:
UITableView *tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 200, 200) style:UITableViewStylePlain];

Answer 3

You need to assign the property tableView to the instance you are creating in the addSpeedTable method, then reference it using self.tableView.
-(void)addSpeedTable {
self.tableView = [[UITableView alloc] initWithFrame:self.view.bounds];
self.tableView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
self.tableView.rowHeight = 45;
self.tableView.sectionFooterHeight = 22;
self.tableView.sectionHeaderHeight = 22;
self.tableView.delegate = self;
self.tableView.dataSource = self;
[self.view addSubview:self.tableView];
}
Edit
As pointed out by the other answers, you'll probably need to set the frame on the UITableView as well:
self.tableView = [[UITableView alloc] initWithFrame:self.view.bounds];
self.tableView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;

Answer 4

You use init method to initialize a view, which means the view's frame is CGRectZero.
So the numberOfRowsInSection is called but SDK finds no cell need to be shown as the frame is CGRectZero.
-(void)addSpeedTable {
.....
tableView.frame = self.view.bounds;
[self.view addSubview:tableView];
}
What's more you should assign your tableView to the property by self.tableView = tableView or your tableView property will never be valid state.

Answer 5

You can add breakpoint at the thirdLine, and print out the frame see if one of its bounds is 0.

Answer 6

I think you may have declare the wrong syntax. I can't upload image, So notice the difference the code below. The capitalization may be the problem.
{
// 服务条款
static NSString * cellId = #"justCommon";
static NSString *CellIdentifier = #"newCell";
}