Using a block in Object-C, I get "Thread 1:EXC_BAD_ACCESS(code=1,address=0x0)" - objective-c

Question

I want to add GestureRecognizer on an imageView and use a block in the clickAction.
But when I run it, I get this error in the block:
Thread 1:EXC_BAD_ACCESS(code=1,address=0x0)
#import "blockImage.h"
#implementation blockImage
-(instancetype)init{
if (self = [super init]) {
self = [[blockImage alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
self.tag = 10;
self.backgroundColor = [UIColor redColor];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:#selector(tapActionWithBolck:)];
[self addGestureRecognizer:tap];
}
return self;
}
-(void)tapActionWithBolck:(void(^)(NSInteger idx))completion{
completion(10);
}
#end
and
#import "ViewController.h"
#import "blockImage.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
blockImage *img = [[blockImage alloc] init];
[self.view addSubview:img];
}
#end

Answer 1

You can not use method like this with UITapGestureRecognizer
-(void)tapActionWithBolck:(void(^)(NSInteger idx))completion;
it should be like that
-(void)tapAction:(UIGestureRecognizer *)sender;
or
-(void)tapAction;
If you want to use block on tap, you should keep it in variable (in init for example) and than call it in method. But keep in mind about retain cycles.