在iOS上以编程方式创建了一个按钮,但按下时没有任何操作

-(void)viewDidLoad {
    UIButton *buttonz = [UIButton buttonWithType:UIButtonTypeCustom];
        buttonz.frame = CGRectMake(160,160,30);
        [buttonz settitle:@"Charge" forState:UIControlStateNormal];
        [buttonz addTarget:self action:@SELEctor(myAction:) forControlEvents:UIControlEventTouchUpInside];
        [buttonz setEnabled:YES];

        [buttonz setBACkgroundColor:[UIColor blueColor]];

        //add the button to the view
        [BACkImageView addSubview:buttonz];
}

-(void)myAction:(id)sender {
NSLog(@"ha");
    [self resignFirstResponder];
    NSLog(@"ha");
}