objective-c 把所有類型為UIButton的子控制項放在父視圖中央 動態建立按鈕

    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:@"動態添加一個按鈕!" 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:@"您點擊了動態按鈕！"     
                                                   delegate:self     
                                          cancelButtonTitle:@"確定"    
                                          otherButtonTitles:nil];    
    [alert show];  

}