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];