我试图弄清楚如何使用 UISegmentedControl 的不同状态来切换视图,类似于 Apple 在 App Store 中在“Top Paid”和“Top Free”之间切换时的做法。
9 回答
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。这是一些关于如何完成的示例代码,绝对不是处理视图的优化方式,而只是为了演示如何使用UISegmentControl切换可见视图:
- (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];
}
}
您当然可以进一步重构代码以隐藏/显示正确的视图。
就我而言,我的视图非常复杂,我不能只更改不同视图的隐藏属性,因为它会占用太多内存。
我已经尝试了几种解决方案,但没有一个对我有用,或者执行不规律,特别是 navBar 的 titleView 在推送/弹出视图时并不总是显示 segmentedControl。
我发现这篇关于这个问题的博客文章解释了如何以正确的方式做到这一点。似乎他在 WWDC'2010 上得到了 Apple 工程师的帮助,才想出了这个解决方案。
http://redartisan.com/2010/6/27/uisegmented-control-view-switching-revisited
此链接中的解决方案是迄今为止我发现的有关该问题的最佳解决方案。稍加调整后,底部的 tabBar 也能正常工作
或者,如果它是一个表格,您可以重新加载表格并在 cellForRowAtIndex 中,根据所选的段选项从不同的数据源填充表格。
一个想法是让带有分段控件的视图具有一个容器视图,您可以在其中填充不同的子视图(当切换段时添加为容器视图的唯一子视图)。您甚至可以为这些子视图拥有单独的视图控制器,但如果您需要它们,您必须转发诸如“viewWillAppear”和“viewWillDisappear”之类的重要方法(并且必须告诉它们它们所在的导航控制器)。
一般来说,这工作得很好,因为您可以在 IB 中使用容器布置主视图,并且子视图将填充容器允许它们拥有的任何空间(确保您的自动调整大小掩码设置正确)。
尝试使用SNFSegmentedViewController
一个开源组件,它可以通过UITabBarController
.
分配 .H 在
UISegmentedControl *lblSegChange;
- (IBAction)segValChange:(UISegmentedControl *) sender
声明.M
- (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 的回答,我创建了这个:
//
// 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
斯威夫特版本:
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的视图层次结构的一部分。
定义惰性属性:
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 SegmentedControl tapEvent
private func updateView() {
if segmentedControl.selectedSegmentIndex == 0 {
remove(asChildViewController: sessionsViewController)
add(asChildViewController: summaryViewController)
} else {
remove(asChildViewController: summaryViewController)
add(asChildViewController: sessionsViewController)
}
}
当然,您可以在您的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")
}
参考: https ://cocoacasts.com/managing-view-controllers-with-container-view-controllers/
一个快速的 Swift 版本:
@IBAction func segmentControlValueChanged(_ sender: UISegmentedControl) {
if segmentControl.selectedSegmentIndex == 0 {
// do something
} else {
// do something else
}
}