iOS implementation code for modifying external variable values ​​in Block

- (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
  // The first one is to modify the static global variable; the second one is to modify the variables modified with the new keyword __block.  __block int blockLocal = 100;
  static int staticLocal = 100;
  void (^aBlock)(void) = ^(void){
    blockLocal++;
    staticLocal++;
  };
  NSLog(@"----blockLocal--%d",blockLocal);
  NSLog(@"---staticLocal--%d",staticLocal);
  aBlock();
  NSLog(@"----blockLocal--%d",blockLocal);
  NSLog(@"---staticLocal--%d",staticLocal);
}

2015-10-23 13:15:30.598 existBlockModify the value of the external variable[7561:195731] ----blockLocal--100
2015-10-23 13:15:30.598 existBlockModify the value of the external variable[7561:195731] ---staticLocal--100
2015-10-23 13:15:30.598 existBlockModify the value of the external variable[7561:195731] ----blockLocal--101
2015-10-23 13:15:30.598 existBlockModify the value of the external variable[7561:195731] ---staticLocal--101