How to overcome UITableViewCell subclass limitation - ios

Question

I have a custom uitableviewcell and subclassed, and it is containing a uitextfield and delegate is also set, now when return key on keyboard is pressed I want to try few things
perform a segue(but issue is I am in uitableviewcell subclass).
modally present another view controller(but issue is uitableviewcell
do not allow this).
I want to display uiactionsheet(but again limitation is
uitableviewcell).
If i get rootviewcontroller reference then rootviewcontroller's view itself not displayed or not the active view so any thing you do will not present on screen, active view is required.

Answer 1

You could use a block property on your cell that is fired whenever your custom button action occurs. Your cell's block property might look something like this:
#interface CustomTableViewCell : UITableViewCell
#property (nonatomic, copy) void (^customActionBlock)();
#end
Your cell would then invoke this block from the custom button action like this:
#implementation CustomTableViewCell
- (IBAction)buttonTapped:(id)sender {
if ( self.customActionBlock ) {
self.customActionBlock();
}
}
#end
Then finally, you set the block in -cellForRowAtIndexPath: back in your view controller (or wherever) like this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
CustomTableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:#"customCell" forIndexPath:indexPath];
cell.textLabel.text = [self.colors objectAtIndex:indexPath.row];
cell.customActionBlock = ^{
NSLog(#"Do the stuff!");
// present view controller modally
// present an action sheet
// etc....
};
return cell;
}
One word of caution, though. If you use blocks you run the risk of strongly referencing self and creating a memory leak. Blocks are fun and easy to use but you have to play by their rules. Here are some resources to help you get familiar with them:
Retain cycle on `self` with blocks
Reference to self inside block
http://aceontech.com/objc/ios/2014/01/10/weakify-a-more-elegant-solution-to-weakself.html
http://fuckingblocksyntax.com

Answer 2

You can attach action to your buttons even if they are in a tableView
[cell.button addTarget:self action:#selector(presentController:) forControlEvents:UIControlEventTouchUpInside];
presentController is referring to an IBAction
- (IBAction)presentController:(id)sender
{
//present
}

Answer 3

Implement button action in Tableview SuperClass.
Or You can use Custom delegate in UITableViewCell subclass. In UITableView Subclass declare a protocol.
#protocol customCellDelegate <NSObject>
#required
-(void)selectedButtonInIndexPath : (NSIndexPath *)indexpath;
#end
Set this property in UITableView Subclass
#property (nonatomic, strong)NSIndexPath *indexpath;
#property (nonatomic, strong) id <customCellDelegate> delegate;
And then in Your UITableView Subclass Button action add This lines
if(self.delegate){
[self.delegate selectedButtonInIndexPath: self.indexpath];
}
And in your tableview datasource method
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
Implement this code
cell.delegate = (id)self;
cell.indexpath = indexPath;
And in Uitableview super class just implement this method
-(void)selectedButtonInIndexPath : (NSIndexPath *)indexpath{
//display uiimagepickercontroller modally or anything else here
}