iOS-xib(使用XIB自定义一个UIView )

- (void)viewDidLoad {
    [super viewDidLoad];
    NSArray *nib = [[NSBundle mainBundle]loadNibNamed:@"CustomView" owner:self options:nil];
    //得到第一个UIView
    UIView *tmpCustomView = [nib objectAtIndex:0];
    //获得屏幕的Frame
    CGRect tmpFrame = [[UIScreen mainScreen] bounds];
    //设置自定义视图的中点为屏幕的中点
    [tmpCustomView setCenter:CGPointMake(tmpFrame.size.width / 2, tmpFrame.size.height / 2)];
    //添加视图
    [self.view addSubview:tmpCustomView];
}