How to remove array object from for loop - objective-c

Question

please Help me. I stuck here when deleting an object from array.
for (id obj in self.arrSavedImage)
{
Class cls = [obj class];
id newObj = [[cls alloc] init];
//UIImage *img = nil;
if([newObj isKindOfClass:[UIImage class]]){
NSLog(#"class type %#", [newObj class]);
}
else{
[self.arrSavedImage removeObject:obj];
}
}
Thank You.

Answer 1

You shouldn't remove objects from an array you are enumerating over. Better is to keep a list of the objects you want to delete, and then delete them when you've finished enumerating the original array:
NSMutableArray *toDelete = [NSMutableArray new];
for (id obj in self.arrSavedImage)
{
Class cls = [obj class];
id newObj = [[cls alloc] init];
if([newObj isKindOfClass:[UIImage class]]){
NSLog(#"class type %#", [newObj class]);
}
else{
[toDelete addObject:obj];
}
}
for (id obj in toDelete)
[self.arrSavedImage removeObject:obj];

Answer 2

NSMutableArray *itemsToDelete = [[NSMutableArray alloc] init];
for (id obj in self.arrSavedImage)
{
Class cls = [obj class];
id newObj = [[cls alloc] init];
//UIImage *img = nil;
if([newObj isKindOfClass:[UIImage class]]){
NSLog(#"class type %#", [newObj class]);
}
else{
[itemsToDelete addObject:obj];
}
}
[self.arrSavedImage removeObjectsInArray:itemsToDelete];

Answer 3

You can not remove the object in array while in loop.
You should create a new array with existing array and remove objects from it. Then replace the old array with editedArray.
NSMutableArray * editedArray = [[NSMutableArray alloc] initWithArray:self.arrSavedImage];
for (id obj in self.arrSavedImage)
{
Class cls = [obj class];
id newObj = [[cls alloc] init];
//UIImage *img = nil;
if([newObj isKindOfClass:[UIImage class]]){
NSLog(#"class type %#", [newObj class]);
}
else{
[editedArray removeObject:obj];
}
}
[self.arrSavedImage setArray:editedArray];
editedArray = nil;