Get height of item from another .m file - ios

Question

I have a custom cell in a UITableView. I programatically created a label with a height of 200 and a width of 50. When I do an NSLog in the customCell.m of the label's width and height, it gives me w: 50 and h: 200. But when I do an NSLog in mainViewController.m it gives me 0 for the height and width.
Not sure why it does that. I need to get the real height of the label in the mainViewController.m
Here's my code:
customCell.m
- (void)awakeFromNib {
self.label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 50, 200)];
[self.label setBackgroundColor:[UIColor yellowColor]];
[self.label setText:#"Hello"];
[self.myView addSubview:self.label];
CGRect myFrame = self.myView.frame;
myFrame.size.height = self.label.frame.size.height;
self.myView.frame = myFrame;
NSLog(#"%f", self.label.frame.size.height); // Results: 200.0000
}
mainViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
customCell *cellVC = [[cutsomCell alloc] init];
NSLog(#"%f, %f", cellVC.label.frame.size.height, cellVC.frame.size.height); // Results: 0.0000, 44.0000
}
I setmyViewto 0 in the storyBoard.
If you don't understand something, please ask and I will be happy to explain.
Update
Here is my code:
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
self.label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 50, 200)];
[self.label setBackgroundColor:[UIColor yellowColor]];
[self.label setText:#"Hello"];
[self.myView addSubview:self.label];
view
}
return self;
}
viewDidLoad
[self.tableView registerClass:[CustomCell class] forCellReuseIdentifier:#"cellID"];
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *customCell = #"customCell";
customCell *cell = [tableView dequeueReusableCellWithIdentifier:#"cellID" forIndexPath:indexPath];
if (cell == nil) {
cell = [[[NSBundle mainBundle] loadNibNamed:customCell owner:nil options:nil] objectAtIndex:0];
}
return cell;
}
The problem now is that when I run the app, no cells get shown. But I do get the correct NSLog.

Answer 1

In your mainViewController you just programmatically created the cellVC using alloc and then init, you did not create it from the nib, like you did it in the customCell.m so the awakeFromNib method was not called on it.
Update
Change back to using the custom cell from xib (instead of registerCell)
[self.tableView registerNib:[UINib nibWithNibName:#"CustomCellxib"
bundle:[NSBundle mainBundle]]
forCellReuseIdentifier:#"CustomCellReuseID"]; // in the viewDidLoad of the mainViewController
Then deque the cell - you do not really need to check if the cell is nil because dequeue is now guaranteed to return a cell
CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:#"customCellReuseID" forIndexPath:indexPath];
in your tableview datasource method
Keep the code currently in your awakeFromNib to initialize the custom cell added from nib. The default cell from the xib is fully initialized here so you should be able to customize the custom view. You do not need the initWithIdentifer anymore
You can optionally implement the table view delegate methods like:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
// calculate the row height or return a constant
return 200.0;
}

Answer 2

The problem is that -awakeFromNib does not get called directly after -init
Try this:
- (instancetype)init {
self = [super init];
if (!self) {
return nil;
}
self.label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 50, 200)];
[self.label setBackgroundColor:[UIColor yellowColor]];
[self.label setText:#"Hello"];
[self.myView addSubview:self.label];
CGRect myFrame = self.myView.frame;
myFrame.size.height = self.label.frame.size.height;
self.myView.frame = myFrame;
NSLog(#"%f", self.label.frame.size.height); // Results: 200.0000
return self;
}