到UINavigationController顶部的UIToolBar位置
到UINavigationController顶部的UIToolBar位置
提问于 2016-05-07 18:29:47
如何将UIToolBar移至顶部(坚持使用UINavigationBar)？
我在这件事上挣扎了很长一段时间，我已经尝试了一些东西，比如：
- 符合
UIToolbarDelegate和(UIBarPosition)positionForBar:(id <UIBarPositioning>)bar的自定义UIToolBar被调用，我返回UIBarPositionTop，但工具栏留在底部。 - 更改工具栏框架：
self.navigationController.toolbar.frame = CGRectMake(0, NAV_BAR_Y, self.view.bounds.size.width, NAV_BAR_HEIGHT); - Custom
UINaviagtionController，它具有以下委托函数：(UIBarPosition)positionForBar:(id <UIBarPositioning>)bar { return UIBarPositionTop; }
所有的挣扎都进行得很顺利，看起来都一样：
任何帮助都是最好的。
(我想让导航看起来像Apple App store导航)
回答 2
Stack Overflow用户
发布于 2019-06-13 03:34:25
我知道有两种选择。
1)与Move UINavigationController's toolbar to the top to lie underneath navigation bar相关
您可以设置UINavigationController的子类，并在设置该值时更改工具栏的Y轴位置。
import UIKit
private var context = 0
class NavigationController: UINavigationController {
private var inToolbarFrameChange = false
var observerBag: [NSKeyValueObservation] = []
override func awakeFromNib() {
super.awakeFromNib()
self.inToolbarFrameChange = false
}
override func viewDidLoad() {
super.viewDidLoad()
observerBag.append(
toolbar.observe(\.center, options: .new) { toolbar, _ in
if !self.inToolbarFrameChange {
self.inToolbarFrameChange = true
toolbar.frame = CGRect(
x: 0,
y: self.navigationBar.frame.height + UIApplication.shared.statusBarFrame.height,
width: toolbar.frame.width,
height: toolbar.frame.height
)
self.inToolbarFrameChange = false
}
}
)
}
override func setToolbarHidden(_ hidden: Bool, animated: Bool) {
super.setToolbarHidden(hidden, animated: false)
var rectTB = self.toolbar.frame
rectTB = .zero
}
}2)您可以创建自己的UIToolbar并添加到UIViewController的视图中。然后，将约束添加到安全区域的前导、尾部和顶部。
import UIKit
final class ViewController: UIViewController {
private let toolbar = UIToolbar()
private let segmentedControl: UISegmentedControl = {
let control = UISegmentedControl(items: ["Op 1", "Op 2"])
control.isEnabled = false
return control
}()
override func loadView() {
super.loadView()
setupToolbar()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
navigationController?.navigationBar.hideBorderLine()
}
private func setupToolbar() {
let barItem = UIBarButtonItem(customView: segmentedControl)
toolbar.setItems([barItem], animated: false)
toolbar.isTranslucent = false
toolbar.isOpaque = false
view.addSubview(toolbar)
toolbar.translatesAutoresizingMaskIntoConstraints = false
toolbar.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
toolbar.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
toolbar.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
}
}
private extension UINavigationBar {
func showBorderLine() {
findBorderLine().isHidden = false
}
func hideBorderLine() {
findBorderLine().isHidden = true
}
private func findBorderLine() -> UIImageView! {
return self.subviews
.flatMap { $0.subviews }
.compactMap { $0 as? UIImageView }
.filter { $0.bounds.size.width == self.bounds.size.width }
.filter { $0.bounds.size.height <= 2 }
.first
}
}Stack Overflow用户
发布于 2016-05-07 19:12:08
尝试此解决方案
@interface ViewController () <UIToolbarDelegate>
{
UIToolbar * lpToolbar;
}
@end
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
lpToolbar = [[UIToolbar alloc] initWithFrame :CGRectZero];
lpToolbar.delegate = self;
self.navigationItem.title = @"Title";
}
-(void) viewWillAppear :(BOOL)animated
{
[super viewWillAppear:animated];
[self.navigationController.view addSubview :lpToolbar];
CGRect rFrame = self.navigationController.navigationBar.frame;
lpToolbar.frame = CGRectMake( 0.0, rFrame.origin.y + rFrame.size.height, rFrame.size.width, 50.0 );
}
-(void) viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[lpToolbar removeFromSuperview];
}
-(UIBarPosition) positionForBar:(id <UIBarPositioning>)bar
{
return UIBarPositionTop;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/37087392
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