UIView下边框？
UIView下边框？
提问于 2011-10-06 03:48:20
对于UIScrollView *toScrollView (屏幕的宽度)，我想添加一个灰色的底部边框(与iPhone原生消息应用程序的撰写视图的To字段完全相同)。
为了实现这一点，我遵循了Cocoa Touch: How To Change UIView's Border Color And Thickness?，用定制的UINavigationBar覆盖了上边框，并将toScrollView的x坐标-1和宽度设置为322，这样左右边框就不在屏幕上了。
这看起来很好，但这是一种黑客行为，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
}回答 15
Stack Overflow用户
回答已采纳
发布于 2011-11-20 05:38:26
您可以使用CALayer，而不是像@ImreKelényi建议的那样使用UIView
// 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];Stack Overflow用户
发布于 2015-06-11 02:25:02
下面是一个更通用的Swift扩展，可以为任何UIView子类创建边框：
import UIKit
extension UIView {
func addTopBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.CGColor
border.frame = CGRectMake(0, 0, self.frame.size.width, width)
self.layer.addSublayer(border)
}
func addRightBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.CGColor
border.frame = CGRectMake(self.frame.size.width - width, 0, width, self.frame.size.height)
self.layer.addSublayer(border)
}
func addBottomBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.CGColor
border.frame = CGRectMake(0, self.frame.size.height - width, self.frame.size.width, width)
self.layer.addSublayer(border)
}
func addLeftBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.CGColor
border.frame = CGRectMake(0, 0, width, self.frame.size.height)
self.layer.addSublayer(border)
}
}Swift 3
extension UIView {
func addTopBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.cgColor
border.frame = CGRect(x: 0, y: 0, width: self.frame.size.width, height: width)
self.layer.addSublayer(border)
}
func addRightBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.cgColor
border.frame = CGRect(x: self.frame.size.width - width, y: 0, width: width, height: self.frame.size.height)
self.layer.addSublayer(border)
}
func addBottomBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.cgColor
border.frame = CGRect(x: 0, y: self.frame.size.height - width, width: self.frame.size.width, height: width)
self.layer.addSublayer(border)
}
func addLeftBorderWithColor(color: UIColor, width: CGFloat) {
let border = CALayer()
border.backgroundColor = color.cgColor
border.frame = CGRect(x: 0, y: 0, width: width, height: self.frame.size.height)
self.layer.addSublayer(border)
}
}Stack Overflow用户
发布于 2018-11-02 18:10:27
针对Swift 4的解决方案
let bottomBorder = CALayer()
bottomBorder.frame = CGRect(x: 0.0, y: calendarView.frame.size.height-1, width: calendarView.frame.width, height: 1.0)
bottomBorder.backgroundColor = #colorLiteral(red: 0.8039215803, green: 0.8039215803, blue: 0.8039215803, alpha: 1)
calendarView.layer.addSublayer(bottomBorder)BackgroundColor lightGray.如果需要，可以更改颜色。
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原文链接：
https://stackoverflow.com/questions/7666863
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