objective-c把所有类型为UIButton的子控件放在父视图中央动态创建按钮 ...

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  for(UIView *view in [self.backgroundView subviews])
    {
        //[view removefromsuperview];
        if([[[view superclass] description] isEqualToString:@"UIButton"])
        {
            UIButton * btn=(UIButton*) view;
            btn.titleLabel.text=@"dynamic title";
            btn.center=btn.superview.center;
        }
    }

- (IBAction)addButton:(id)sender {
    CGRect frame = CGRectMake(90, 200, 200, 60);
    UIButton *someAddButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    someAddButton.backgroundColor = [UIColor clearColor];
    [someAddButton setTitle:@"动态添加一个按钮!" forState:UIControlStateNormal];
    someAddButton.frame = frame;
    [someAddButton addTarget:self action:@selector(someButtonClicked) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:someAddButton];

}

-(void) someButtonClicked{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
                                                    message:@"您点击了动态按钮！"
                                                   delegate:self
                                          cancelButtonTitle:@"确定"
                                          otherButtonTitles:nil];
    [alert show];

}