Get the current width of an UITableViewCell - ios

Question

I have a custom cell (subclass of UITableViewCell) and I have some UITextField in it whose relative position within the cell I want to choose.
So my code resembles that :
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
NSInteger offset = 230;
UITextField *myTextField = [[UITextField alloc] initWithFrame:CGRectMake(offset, 10, 95, 30)];
[self.contentView addSubview:myTextField];
}
return self;
}
Now my problem is that this works fine in portrait mode but in landscape mode I would like to adjust offset to simulate a right align of my textfield. Similarly, I would like to be able to adjust for an iPad.
How can I get the current width of my cell ?
I tried to use self.contentView.frame.size.width and self.contentView.bounds.size.width but both always return 320.
I know it sounds like a question that would have been asked thousand times but I haven't found anything...
NB : I am aware there will be issues to handle with reusing cells but I have not gotten to this point yet.

Answer 1

The default size of UITableViewCell depending on xib(storyboard) if it's initialized from xib or storyboard.
If your cell initialized from code like this:
[tableView dequeueReusableCellWithIdentifier:CELL_IDENTIFIER forIndexPath:indexPath]
So your cell will be initialized first(the size always (320.0, 44.0) whether iphone or ipad), and then be resized.
So you have to adjust the width of the myTextField while the Cell's size changed.
There are 3 solutions:
Use AutoLayout:
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
UITextField *myTextField = [[UITextField alloc] init];
[self.contentView addSubview:myTextField];
myTextField.translatesAutoresizingMaskIntoConstraints = NO;
[self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|-10-[textField(==30)]"
options:NSLayoutFormatDirectionLeadingToTrailing
metrics:nil
views:#{#"textField" : myTextField}]];
[self.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"H:[textField(==95)]-0-|"
options:NSLayoutFormatDirectionLeadingToTrailing
metrics:nil
views:#{#"textField" : myTextField}]];
}
return self;
}
Use autoresizingMask as #jpulikkottil said:
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
NSInteger offset = 230;
UITextField *myTextField = [[UITextField alloc] initWithFrame:CGRectMake(offset, 10, 95, 30)];
[self.contentView addSubview:myTextField];
mytextfield.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;
}
return self;
}
Use layoutSubviews
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
UITextField *myTextField = [[UITextField alloc] init];
self.myTextField = myTextField;
[self.contentView addSubview:myTextField];
}
return self;
}
- (void)layoutSubviews {
[super layoutSubviews];
NSInteger offset = self.contentView.bounds.size.width - 95;
self.myTextField.frame = CGRectMake(offset, 10, 95, 30);
}

Answer 2

An example with NSLayoutConstraint (recommanded)
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
UITextField *myTextField = [[UITextField alloc] init];
myTextField.translatesAutoresizingMaskIntoConstraints = NO;
[self.contentView addSubview:myTextField];
[self.contentView addConstraint:[NSLayoutConstraint constraintsWithVisualFormat:#"H:[textField(==95)]|" options:0 metrics:nil views:#{#"textField",textField}]];
//Add vertical constraints then
}
return self;
}
This fixes the textField to the contentView's right, and set its width to 95.
You still have to add verticals constraints but its not the point here.
edit: fixed runtime error

Answer 3

check cell size inside mention method
-(void) viewDidLayoutSubviews
{
NSIndexPath *indexPath=[NSIndexPath indexPathForRow:2 inSection:1];
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
NSLog(#"width=%f",cell.contentView.frame.size.width);
}
write this function inside viewcontroller.