iosobjective-csuperview

Getting UITableViewCell with superview in iOS 7


I'm getting the UITableViewCell a UIButton belongs to like this:

-(void)buttonHandler:(UIButton *)button {

    OrderCell *cell = [[button superview] superview];
    NSLog(@"cell.item = %@", cell.item.text);

And it works fine in anything before iOS 7. But gives me:

[UITableViewCellScrollView item]: unrecognized selector sent to instance 0x17ae2cf0

if I run the app in iOS 7. BUT if I do:

-(void)buttonHandler:(UIButton *)button {

    OrderCell *cell = [[[button superview] superview] superview];
    NSLog(@"cell.item = %@", cell.item.text);

Then it works in iOS 7 but not earlier?!?!?!

I'm circumventing the issue by doing this:

OrderCell *cell;
if([[[UIDevice currentDevice] systemVersion] isEqualToString:@"7.0"])
    cell = [[[button superview] superview] superview];
else
    cell = [[button superview] superview];

NSLog(@"cell.item = %@", cell.item.text);

but WTF is going on!? Does anyone know why this happens?

Thanks!


Solution

  • A better solution is to add a category for UIView(SuperView), and calling it by:

    UITableViewCell *cell = [button findSuperViewWithClass:[UITableViewCell class]]
    

    This way, your code works for all future and past iOS versions

    @interface UIView (SuperView)
    
    - (UIView *)findSuperViewWithClass:(Class)superViewClass;
    
    @end
    
    
    @implementation UIView (SuperView)
    
    - (UIView *)findSuperViewWithClass:(Class)superViewClass {
    
        UIView *superView = self.superview;
        UIView *foundSuperView = nil;
    
        while (nil != superView && nil == foundSuperView) {
            if ([superView isKindOfClass:superViewClass]) {
                foundSuperView = superView;
            } else {
                superView = superView.superview;
            }
        }
        return foundSuperView;
    }
    @end