从Xib中加载控件

NSBundle* bundle = [ NSBundle mainBundle];

//加载xib中的view

UIview* subView = [[bundle loadNibNamed:@“xibName” owner:nil options:nil] lastObject];

[self.view addSubview subView];

//获取subView的子控件  按照xib中控件的顺序取得子控件

UIImageView*imageView = subView.subViews[0];

                                                 = [subView viewWithTag:0];