iOS(Objective-C). Application crash when getting block from array - ios

Question

Have a question about blocks in objective-c.
For example I have a list of actions.
I'm initializing an array of blocks:
self.actions = #[
^() { [self showObject:self.object_1]; },
^() { [self showObject:self.object_2]; },
^() { [self showObject:self.object_3]; }
];
And calling them when some row is pressed:
- (void)pressedRowAtIndex:(NSInteger)index {
if (index < actions.count) {
void (^action)() = [actions objectAtIndex:index];
if (action != nil) {
action();
}
}
}
And all works fine without problem. But when I init my actions array by using initWithObjects method:
self.actions = [NSArray alloc] initWithObjects:
^() { [self showObject:self.object_1]; },
^() { [self showObject:self.object_2]; },
^() { [self showObject:self.object_3]; },
nil
];
Than I get crash trying to get action by index by using objectAtIndex method of NSArray class.
I understand the difference between this inits. First one don't increase reference count like first do. But can someone explain why it crash?
Edit:
All that I've found. Maybe I'm nub and somewhere else is another useful information.
There is no crash info in terminal:
Code for Onik IV:
Small example:
#interface ViewController () {
NSArray *actions;
}
#property (nonatomic, strong) NSString *object1;
#property (nonatomic, strong) NSString *object2;
#property (nonatomic, strong) NSString *object3;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
actions = [[NSArray alloc] initWithObjects:
^() { [self showObject:self.object1];},
^() { [self showObject:self.object2]; },
^() {[self showObject:self.object3]; },
nil];
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
self.object1 = #"object 1";
self.object2 = #"object 2";
self.object3 = #"object 3";
void(^firsSimpleBlock)(void) = [actions lastObject];
firsSimpleBlock();
void(^simpleBlock)(void) = [actions firstObject];
simpleBlock();
}
-(void)showObject:(NSString *)object
{
NSLog(#"Show: %#",object);
}
#end

Answer 1

Try something like this.
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
(^someBlock)(void) = ^void(void){
self.object1;
};
actions = [[NSArray alloc] initWithObjects:
[someBlock copy],
[someOtherBlock copy],
[anotherBlock copy],
nil];
}
Blocks are allocated on the stack and are therefor removed when the frame is removed from the stack leading to sail pointers for all pointers pointing to that block. When you allocate a object with the literal "#" sign the object is allocated in a pool so all literals that are the "same" point to the same instance and are never deallocated.
NSString *a = #"A";
NSString *b = #"A";
points to the same instance of a string, while:
NSString *a = [NSString stringWithFormat:#"A"];
NSString *b = [NSString stringWithFormat:#"A"];
are two different objects.
So it works when you are creating a literal array but when you add the blocks dynamically they will be removed when its time to use them therefor the BAD_ACCESS. Solution is to send "copy" message to the block that will copy it to the heap and the block will not be released.

Answer 2

It´s the same, you must have another kind of problem (sintax?).
Try this:
#interface ViewController ()
#property (nonatomic, strong) NSString *object1;
#property (nonatomic, strong) NSString *object2;
#property (nonatomic, strong) NSString *object3;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.object1 = #"object 1";
self.object2 = #"object 2";
self.object3 = #"object 3";
NSArray *actions = #[^() { [self showObject:self.object1];},
^() { [self showObject:self.object2]; },
^() {[self showObject:self.object3]; }
];
NSArray *secondActions = [[NSArray alloc] initWithObjects:
^() { [self showObject:self.object1];},
^() { [self showObject:self.object2]; },
^() { [self showObject:self.object3];},
nil
];
void(^firsSimpleBlock)(void) = [actions lastObject];
firsSimpleBlock();
void(^simpleBlock)(void) = [secondActions firstObject];
simpleBlock();
}
-(void)showObject:(NSString *)object
{
NSLog(#"Show: %#",object);
}
#end