Why is __strong required in fast enumeration loops with ARC

Question

When I do something simialr to the following I get an error saying

for (UIView* att in bottomAttachments) {
    if (i <= [cells count]) {
        att = [         


        

Answer 1

Why are you assigning a new value to that pointer anyway? Are you trying to replace an object in the array? In that case you need to save what you want to replace in a collection and do it outside the enumeration since you can't mutate an array while enumerating.

NSMutableDictionary * viewsToReplace = [[NSMutableDictionary alloc] init];
NSUInteger index = 0;

for(UIView * view in bottomAttachments){
    if (i <= [cells count]) {
        // Create your new view
        UIView * newView = [[UIView alloc] init];
        // Add it to a dictionary using the current index as a key
        viewsToReplace[@(index)] = newView;
    }
    index++;
}

// Enumerate through the keys in the new dictionary
// and replace the objects in the original array
for(NSNumber * indexOfViewToReplace in viewsToReplace){
    NSInteger index = [indexOfViewToReplace integerValue];
    UIView * newView = viewsToReplace[indexOfViewToReplace];
    [array replaceObjectAtIndex:index withObject:newView];
}