nib

1.  通过nib自定义UIView

  a.创建nib文件

  b.获取视图

    NSArray *nib = [[NSBundle mainBundle]loadNibNamed:@"CustemNib" owner:self options:nil];
    UIView *view1 = [nib  objectAtIndex:0];
    CGRect tmpFrame = [[UIScreen mainScreen] bounds];
    //设置自定义视图的中点为屏幕的中点
    [view1 setCenter:CGPointMake(tmpFrame.size.width / 2, tmpFrame.size.height / 2)];
    //加入
    [self.view addSubview:view1];