这是我想要实现的目标：
UIViewController是UITableViewController UIViewController，在那里他们可以输入文本并保存它UIViewController UIViewController中重新排列表格时，用户可以在预览中看到更改如果重新安排UIViewController，如何更改/移动预览UITableViewController上的文字？
非常感谢任何一般方法，技巧，教程和示例！
谢谢！
编辑，这是我的代码：
Singleton .h
#import <Foundation/Foundation.h>
@interface MyInformation : NSObject
{
NSMutableArray * informationArray;
NSMutableString * nameString;
NSMutableString * jobString;
}
@property (nonatomic, retain) NSMutableArray * informationArray;
@property (nonatomic, retain) NSMutableString * nameString;
@property (nonatomic, retain) NSMutableString * jobString;
+ (id)sharedInformation;
@end
Singleton .m
#import "MyInformation.h"
@implementation MyInformation
static MyInformation * _sharedMyInformation = nil;
@synthesize informationArray = _informationArray;
@synthesize nameString = _nameString;
@synthesize jobString = _jobString;
#pragma mark Singleton Methods
+ (id)sharedInformation
{
@synchronized(self)
{
if (_sharedMyInformation == nil)
{
_sharedMyInformation = [[self alloc] init];
}
}
return _sharedMyInformation;
}
- (id)init
{
if (self = [super init])
{
_nameString = [[NSMutableString alloc] init];
_jobString = [[NSMutableString alloc] init];
_informationArray = [[NSMutableArray alloc] initWithObjects:_nameString, _jobString, nil];
}
return self;
}
@end
ViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
if ([[UIScreen mainScreen] bounds].size.height == 568)
{
self.aTableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 1136) style:UITableViewStyleGrouped];
self.aTableView.delegate = self;
self.aTableView.dataSource = self;
[self.view addSubview:self.aTableView];
self.editBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Edit" style:UIBarButtonItemStylePlain target:self action:@selector(editButtonTapped)];
self.navigationItem.rightBarButtonItem = self.editBarButtonItem;
}
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.aTableView reloadData];
}
- (void)editButtonTapped
{
if (self.editing)
{
[super setEditing:NO animated:NO];
[self.aTableView setEditing:NO animated:NO];
[self.aTableView reloadData];
[self.editBarButtonItem setTitle:@"Edit"];
[self.navigationItem.rightBarButtonItem setStyle:UIBarButtonItemStylePlain];
}
else
{
[super setEditing:YES animated:YES];
[self.aTableView setEditing:YES animated:YES];
[self.aTableView reloadData];
[self.editBarButtonItem setTitle:@"Done"];
[self.editBarButtonItem setStyle:UIBarButtonItemStyleDone];
}
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 2;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
MyInformation * myInformation = [MyInformation sharedInformation];
int count = [myInformation.informationArray count];
if (section == 0)
{
return count;
}
else if (section == 1)
{
return 1;
}
return count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString * CellIdentifier = @"CellIdentifier";
UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
MyInformation * myInformation = [MyInformation sharedInformation];
if (indexPath.section == 0 && indexPath.row == 0)
{
cell.textLabel.text = [NSString stringWithFormat:@"%@", myInformation.nameString];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
if (indexPath.section == 0 && indexPath.row == 1)
{
cell.textLabel.text = [NSString stringWithFormat:@"%@", myInformation.jobString];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
if (indexPath.section == 1 && indexPath.row == 0)
{
cell.textLabel.text = @"Preview";
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
if (indexPath.section == 0 && indexPath.row == 0)
{
NameViewController * name = [[NameViewController alloc] initWithNibName:@"NameViewController" bundle:nil];
[self.navigationController pushViewController:name animated:YES];
}
if (indexPath.section == 0 && indexPath.row == 1)
{
JobViewController * job = [[JobViewController alloc] initWithNibName:@"JobViewController" bundle:nil];
[self.navigationController pushViewController:job animated:YES];
}
if (indexPath.section == 1 && indexPath.row == 0)
{
PreviewViewController * preview = [[PreviewViewController alloc] initWithNibName:@"PreviewViewController" bundle:nil];
[self.navigationController pushViewController:preview animated:YES];
}
}
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath
{
MyInformation * myInformation = [MyInformation sharedInformation];
NSString * item = [myInformation.informationArray objectAtIndex:sourceIndexPath.row];
[myInformation.informationArray removeObjectAtIndex:sourceIndexPath.row];
[myInformation.informationArray insertObject:item atIndex:destinationIndexPath.row];
}
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == 0 )
{
return YES;
}
else
{
return NO;
}
}
@end
编辑2：
我不相信我的阵列会更新。
以下是我的保存代码示例：
- (IBAction)saveButtonTapped
{
MyInformation * myInformation = [MyInformation sharedInformation];
if (_nameTextField.text == nil)
{
myInformation.nameString = @"";
}
else
{
[myInformation.nameString setString:@""];
[myInformation.nameString appendFormat:@"%@", _nameTextField.text];
}
[self.navigationController popToRootViewControllerAnimated:YES];
}
在此日志中，nameString会更新为我输入的任何文本并保存。
但我的informationArray总是返回（“”，“”）
编辑3＆amp; 4：
使用设置字符对单例中的字符串进行硬编码。
现在我可以重新安排好桌子了。
以下是更新的代码。当重新排列表格时，预览页面上的标签将重新排列。
这是代码：
- (void)viewDidLoad
{
[super viewDidLoad];
MyInformation * myInformation = [MyInformation sharedInformation];
_nameLabel = [[UILabel alloc] init];
_nameLabel.frame = CGRectMake(20, 20, 300, 44);
_nameLabel.text = [NSString stringWithFormat:@"%@", [myInformation.informationArray objectAtIndex:0]];
_jobLabel = [[UILabel alloc] init];
_jobLabel.frame = CGRectMake(50, 50, 300, 44);
_jobLabel.text = [NSString stringWithFormat:@"%@", [myInformation.informationArray objectAtIndex:1]];
[self.view addSubview:_nameLabel];
[self.view addSubview:_jobLabel];
}
编辑5：
唯一要做的就是如何更新单例和UITableViewCells中字符串中的文本？
编辑6：
我解决了这个问题。我不得不将Singleton中的字符串更改为NSMutableStrings。我修改了我的保存按钮代码，将字符串设置为空值，并将其附加到文本字段文本。在此之后它现在按预期工作！
感谢您的帮助和建议！
答案 0 :(得分：0)
我假设你有一个支持NSMutableArray，但答案应该推广到任何数据存储方案。
使用tableView:moveRowAtIndexPath:toIndexPath:检测用户何时重新排序第一个表并通过删除fromIndexPath.row处的对象并将其插入toIndexPath.row来更新支持数组。这可确保您的支持模型准确反映用户在UI中所做的更改。
当用户移动到预览视图时，该视图需要从同一个共享数据源（我们在＃1中修改过的那个）中提取，或者获得刚刚重新排列的数组的副本。后一种情况更简单，可以通过在预览控制器上添加NSArray属性来完成：@property(nonatomic, copy) NSArray *itemsToPreview。然后确保预览控制器使用该阵列而不是原始阵列。