UIButton未收到点击。

    UIButton *svObjectButton = [UIButton buttonWithType:UIButtonTypeCustom];

    svObjectButton.frame = CGRectMake(0, 0, 100, 100);

    [svObjectButton addTarget:self action:@selector(svObjectTouchUpInside) forControlEvents:UIControlEventTouchUpInside];       
    [svView addSubview:svObjectButton];

    UIButton *removeButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    removeButton.frame = CGRectMake(0, 0, 20, 20);
    [removeButton addTarget:self action:@selector(removeButtonPressed) forControlEvents:UIControlEventTouchUpInside];
    [svObjectButton addSubview:removeButton];
    [svObjectButton bringSubviewToFront:removeButton];