相关疑难解决方法(0)

对于UIScrollView *toScrollView(这是屏幕的宽度),我想添加一个灰色的底部边框(与iPhone的原生消息应用程序的撰写视图的to-field完全相同).

为了做到这一点,我跟随Cocoa Touch:如何改变UIView的边框颜色和厚度？并使用自定义覆盖顶部边框UINavigationBar并制作了toScrollViewx坐标-1和宽度322,以便左右边框就在屏幕外.

这看起来很好,但它有点像黑客,我想知道是否有更好的方法来做到这一点.

- (void)viewDidLoad {
    [super viewDidLoad];

    // Add UINavigationBar *navigationBar at top.
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]
                                             initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
                                             target:self action:@selector(cancelAction)];
    UINavigationBar *navigationBar = [[UINavigationBar alloc]
                                      initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 44.0f)];
    navigationBar.items = [NSArray arrayWithObject:self.navigationItem];

    // Add UIScrollView *toScrollView below navigationBar.
    UIScrollView *toScrollView = [[UIScrollView alloc]
                                  initWithFrame:CGRectMake(-1.0f, 43.0f, 322.0f, 45.0f)];
    toScrollView.backgroundColor = [UIColor whiteColor];
    toScrollView.layer.borderColor = [UIColor colorWithWhite:0.8f alpha:1.0f].CGColor;
    toScrollView.layer.borderWidth = 1.0f;
    [self.view addSubview:toScrollView];
    [self.view addSubview:navigationBar]; // covers top of toScrollView …