我正在尝试弄清如何使用 UISegmentedControl 的不同状态来切换视图,类似于 Apple 在 App Store 中在“收费最高”和“免费榜单”之间进行切换的方式。
我正在尝试弄清如何使用 UISegmentedControl 的不同状态来切换视图,类似于 Apple 在 App Store 中在“收费最高”和“免费榜单”之间进行切换的方式。
最简单的方法是拥有两个视图,您可以切换它们的可见性以指示选择了哪个视图。以下是一些示例代码,展示了如何使用 UISegmentControl 切换可见视图,这绝对不是处理视图的优化方式,只是为了演示如何使用它:
- (IBAction)segmentSwitch:(id)sender {
UISegmentedControl *segmentedControl = (UISegmentedControl *) sender;
NSInteger selectedSegment = segmentedControl.selectedSegmentIndex;
if (selectedSegment == 0) {
//toggle the correct view to be visible
[firstView setHidden:NO];
[secondView setHidden:YES];
}
else{
//toggle the correct view to be visible
[firstView setHidden:YES];
[secondView setHidden:NO];
}
}
当然,您可以进一步重构代码以隐藏/显示正确的视图。
在我的情况下,我的观点非常复杂,我不能仅仅改变不同视图的隐藏属性,因为这将占用太多内存。
我尝试了几种解决方案,但都没有起作用,或者表现不稳定,特别是当推送/弹出视图时,navBar 的 titleView 并不总是显示 segmentedControl。
我发现了这篇博客文章,它解释了如何以正确的方式解决这个问题。看起来他在 WWDC'2010 上得到了苹果工程师的帮助来想出这个解决方案。
http://redartisan.com/2010/6/27/uisegmented-control-view-switching-revisited
这个链接里的解决方案是迄今为止我找到的关于这个问题最好的解决方案。稍微调整一下,它也可以很好地适用于底部的 tabBar。
Swift版本:
父视图控制器负责设置每个子视图控制器的视图大小和位置。子视图控制器的视图成为父视图控制器视图层次结构的一部分。
定义延迟加载属性:
private lazy var summaryViewController: SummaryViewController = {
// Load Storyboard
let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
// Instantiate View Controller
var viewController = storyboard.instantiateViewController(withIdentifier: "SummaryViewController") as! SummaryViewController
// Add View Controller as Child View Controller
self.add(asChildViewController: viewController)
return viewController
}()
private lazy var sessionsViewController: SessionsViewController = {
// Load Storyboard
let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
// Instantiate View Controller
var viewController = storyboard.instantiateViewController(withIdentifier: "SessionsViewController") as! SessionsViewController
// Add View Controller as Child View Controller
self.add(asChildViewController: viewController)
return viewController
}()
显示/隐藏子视图控制器:
private func add(asChildViewController viewController: UIViewController) {
// Add Child View Controller
addChildViewController(viewController)
// Add Child View as Subview
view.addSubview(viewController.view)
// Configure Child View
viewController.view.frame = view.bounds
viewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
// Notify Child View Controller
viewController.didMove(toParentViewController: self)
}
private func remove(asChildViewController viewController: UIViewController) {
// Notify Child View Controller
viewController.willMove(toParentViewController: nil)
// Remove Child View From Superview
viewController.view.removeFromSuperview()
// Notify Child View Controller
viewController.removeFromParentViewController()
}
管理分段控件的点击事件
private func updateView() {
if segmentedControl.selectedSegmentIndex == 0 {
remove(asChildViewController: sessionsViewController)
add(asChildViewController: summaryViewController)
} else {
remove(asChildViewController: summaryViewController)
add(asChildViewController: sessionsViewController)
}
}
当然,您可以在子视图控制器类中使用:
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
print("Summary View Controller Will Appear")
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
print("Summary View Controller Will Disappear")
}
Reference: https://cocoacasts.com/managing-view-controllers-with-container-view-controllers/
UISegmentedControl *lblSegChange;
- (IBAction)segValChange:(UISegmentedControl *) sender
- (IBAction)segValChange:(UISegmentedControl *) sender
{
if(sender.selectedSegmentIndex==0)
{
viewcontroller1 *View=[[viewcontroller alloc]init];
[self.navigationController pushViewController:view animated:YES];
}
else
{
viewcontroller2 *View2=[[viewcontroller2 alloc]init];
[self.navigationController pushViewController:view2 animated:YES];
}
}
根据 @Ronnie Liew 的答案,我创建了以下内容:
//
// ViewController.m
// ResearchSegmentedView
//
// Created by Ta Quoc Viet on 5/1/14.
// Copyright (c) 2014 Ta Quoc Viet. All rights reserved.
//
#define SIZE_OF_SEGMENT 56
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize theSegmentControl;
UIView *firstView;
UIView *secondView;
CGRect leftRect;
CGRect centerRect;
CGRect rightRect;
- (void)viewDidLoad
{
[super viewDidLoad];
leftRect = CGRectMake(-self.view.frame.size.width, SIZE_OF_SEGMENT, self.view.frame.size.width, self.view.frame.size.height-SIZE_OF_SEGMENT);
centerRect = CGRectMake(0, SIZE_OF_SEGMENT, self.view.frame.size.width, self.view.frame.size.height-SIZE_OF_SEGMENT);
rightRect = CGRectMake(self.view.frame.size.width, SIZE_OF_SEGMENT, self.view.frame.size.width, self.view.frame.size.height-SIZE_OF_SEGMENT);
firstView = [[UIView alloc] initWithFrame:centerRect];
[firstView setBackgroundColor:[UIColor orangeColor]];
secondView = [[UIView alloc] initWithFrame:rightRect];
[secondView setBackgroundColor:[UIColor greenColor]];
[self.view addSubview:firstView];
[self.view addSubview:secondView];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)segmentSwitch:(UISegmentedControl*)sender {
NSInteger selectedSegment = sender.selectedSegmentIndex;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.2];
if (selectedSegment == 0) {
//toggle the correct view to be visible
firstView.frame = centerRect;
secondView.frame = rightRect;
}
else{
//toggle the correct view to be visible
firstView.frame = leftRect;
secondView.frame = centerRect;
}
[UIView commitAnimations];
}
@end
快速的 Swift 版本:
@IBAction func segmentControlValueChanged(_ sender: UISegmentedControl) {
if segmentControl.selectedSegmentIndex == 0 {
// do something
} else {
// do something else
}
}