[objective c] 点可以用个block代替@selector

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

UITapGestureRecognizer *customGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:^(UITapGestureRecognizer *)con{
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle"Title"
message"Message"
delegate:nil
cancelButtonTitle"OK"
otherButtonTitles:nil];
[alert show];
}];
[self.view addGestureRecognizer: customGesture ];

block不可以替代selector，可以在function中写block