UIView底部边界? [英] UIView bottom border?
问题描述
到 UIScrollView * toScrollView
(这是屏幕的宽度),我想添加一个灰色的底部边框(完全类似于to-field的撰写iPhone原生消息应用程序的视图。
To a UIScrollView *toScrollView
(which is the width of the screen), I want to add a gray bottom border (exactly like that of the to-field of the compose view of the iPhone's native Messages app).
为实现这一目标,我遵循了 Cocoa Touch:如何改变UIView的边框颜色和厚度?并且只是用自定义<$覆盖顶部边框c $ c> UINavigationBar 并使 toScrollView
的x坐标-1&宽度322使左和右;正确的边框就在屏幕外。
To achieve this, I followed Cocoa Touch: How To Change UIView's Border Color And Thickness? and just covered the top border with the custom UINavigationBar
and made the toScrollView
's x-coordinate -1 & width 322 so that the left & right borders are just off screen.
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。
This looks fine, but it's sort of a hack, and I was wondering if there's a better way to do this.
- (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
}
推荐答案
而不是使用 UIView
,正如@ImreKelényi建议的那样,您可以使用 CALayer
:
Instead of using a UIView
, as @ImreKelényi suggests, you can use a CALayer
:
// Add a bottomBorder.
CALayer *bottomBorder = [CALayer layer];
bottomBorder.frame = CGRectMake(0.0f, 43.0f, toScrollView.frame.size.width, 1.0f);
bottomBorder.backgroundColor = [UIColor colorWithWhite:0.8f
alpha:1.0f].CGColor;
[toScrollView.layer addSublayer:bottomBorder];
这篇关于UIView底部边界?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!