我使用以下代码显示uitableview
中的复选标记 {
// NSArray *tableContents;
NSMutableArray *selectedMarks; // You need probably to save the selected cells for use in the future.
}
@property (strong, nonatomic) IBOutlet UITableView *languageTableView;
@property (nonatomic, strong) NSArray *tableContents;
@end
@implementation QPLanguageSettingsController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
[self initialisation];
selectedMarks = [NSMutableArray new];
}
#pragma mark - View Life Cycle
-(void)initialisation
{
_tableContents = [NSArray arrayWithObjects:@"English",@"Spanish",@"Russian",@"Arabic",@"Portuguese",@"French",@"German",@"German",@"German",@"German",@"German",@"German",@"German",@"German", nil];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - UITableView delegate & datasources
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 14;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"newFriendCell";
UITableViewCell *cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
//etc.
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.textLabel.textColor = [UIColor whiteColor];
cell.backgroundColor = [UIColor clearColor];
[cell setIndentationLevel:3];
[cell setIndentationWidth:10];
NSString *text = [_tableContents objectAtIndex:[indexPath row]];
//cell.isSelected = [selectedMarks containsObject:text] ? YES : NO;
cell.textLabel.text = text;
NSDictionary *item = [_tableContents objectAtIndex:indexPath.row];
if ([selectedMarks containsObject:item])
{
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
else
{
cell.accessoryType = UITableViewCellAccessoryNone;
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
//if you want only one cell to be selected use a local NSIndexPath property instead of array. and use the code below
//self.selectedIndexPath = indexPath;
//the below code will allow multiple selection
NSDictionary *item = [_tableContents objectAtIndex:indexPath.row];
if ([selectedMarks containsObject:item])
{
[selectedMarks removeObject:item];
}
else
{
[selectedMarks addObject:item];
}
[tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}
但问题是，当我再次来到视图控制器时，所有的复选标记都会消失。如何解决它。请记住，我在uitableview中使用了多个选择。
答案 0 :(得分：3)
我试着为你的问题找到解决方案。我成功了。它运作得很好。
这是示例一。试试这段代码。工作正常。
ViewController.h
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
@property (strong, nonatomic) IBOutlet UITableView *tableViewCheckMarkPreviousSelectionUpdate;
@end
ViewController.m
#import "ViewController.h"
@interface ViewController ()
{
NSMutableArray *arrProductSelection,*arrProductSelectDeSelectCheckMark;
NSArray *arrayFetchFromDefaults;
}
@end
@implementation ViewController
@synthesize tableViewCheckMarkPreviousSelectionUpdate;
- (void)viewDidLoad
{
[super viewDidLoad];
arrProductSelection = [[NSMutableArray alloc]initWithObjects:@"iPhone",@"iPad",@"iPod",@"iTV",@"iWatch",@"iMac",nil];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)viewWillAppear:(BOOL)animated
{
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
arrayFetchFromDefaults = [userDefaults objectForKey:@"selectedcheckmark"];
arrProductSelectDeSelectCheckMark = [[NSMutableArray alloc]initWithArray:arrayFetchFromDefaults];
if(arrProductSelectDeSelectCheckMark.count == 0)
{
arrProductSelectDeSelectCheckMark = [[NSMutableArray alloc]init];
for(int j=0;j<[arrProductSelection count];j++)
{
[arrProductSelectDeSelectCheckMark addObject:@"deselected"];
}
}
[tableViewCheckMarkPreviousSelectionUpdate reloadData];
}
#pragma mark - UITableViewDataSource Methods
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return arrProductSelection.count;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *strCell = @"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:strCell];
if(cell==nil)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:strCell];
}
if([[arrProductSelectDeSelectCheckMark objectAtIndex:indexPath.row] isEqualToString:@"deselected"])
cell.accessoryType = UITableViewCellAccessoryNone;
else
cell.accessoryType = UITableViewCellAccessoryCheckmark;
cell.textLabel.text = [arrProductSelection objectAtIndex:indexPath.row];
return cell;
}
#pragma mark - UITableViewDelegate Methods
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
@try
{
CGPoint touchPoint = [cell convertPoint:CGPointZero toView:tableViewCheckMarkSelectionUpdate];
NSIndexPath *indexPath = [tableViewCheckMarkSelectionUpdate indexPathForRowAtPoint:touchPoint];
NSLog(@"%@",arrProductSelectDeSelectCheckMark);
if([arrProductSelectDeSelectCheckMark count]==0)
{
for(int i=0; i<[arrProductSelection count]; i++)
{
[arrProductSelectDeSelectCheckMark addObject:@"deselected"];
}
}
if([[arrProductSelectDeSelectCheckMark objectAtIndex:indexPath.row] isEqualToString:@"deselected"])
{
cell.accessoryType = UITableViewCellAccessoryCheckmark;
[arrProductSelectDeSelectCheckMark replaceObjectAtIndex:indexPath.row withObject:@"selected"];
}
else
{
cell.accessoryType = UITableViewCellAccessoryNone;
[arrProductSelectDeSelectCheckMark replaceObjectAtIndex:indexPath.row withObject:@"deselected"];
}
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:arrProductSelectDeSelectCheckMark forKey:@"selectedcheckmark"];
[defaults synchronize];
}
@catch (NSException *exception) {
NSLog(@"The exception is-%@",exception);
}
}
@end
答案 1 :(得分：0)
您有多种解决方案：
在运行时，您使用
NSUserDefaults对象从用户的默认数据库中读取应用程序使用的默认值。 NSUserDefaults缓存信息以避免每次需要默认时打开用户的默认数据库
您可以找到示例here。但NSUserDefaults是保存设置/配置/设置信息，或者可能是用户信息，而不是您需要的用例。
答案 2 :(得分：0)
您可以创建一个Singleton并在其上存储数据：
Singleton.h
@interface Singleton : NSObject
@property (nonatomic, strong) NSArray *rowsChecked;
+ (Singleton *)sharedInstance;
+ (NSArray *)getRowsChecked;
+ (void)setRowsChecked:(NSArray *)rowsChecked;
@end
Singleton.m
#import "Singleton.h"
@implementation Singleton
static Singleton *sharedObject;
+ (Singleton *)sharedInstance;
{
if (sharedObject == nil) {
static dispatch_once_t pred;
dispatch_once(&pred, ^{
sharedObject = [[Singleton alloc] init];
});
}
return sharedObject;
}
+ (NSArray *)getRowsChecked
{
Singleton *singleton = [Singleton sharedInstance];
return singleton.rowsChecked;
}
+ (void)setRowsChecked:(NSArray *)rowsChecked
{
Singleton *singleton = [Singleton sharedInstance];
singleton.rowsChecked= rowsChecked;
}
@end
并访问您的Singleton：
[[Singleton sharedInstance] getRowsChecked]
// or
[[Singleton sharedInstance] setRowsChecked:anArray];
答案 3 :(得分：0)
使用以下代码：
#import "ViewController.h"
@interface ViewController ()<UITableViewDelegate, UITableViewDataSource>
@property (weak, nonatomic) IBOutlet UITableView *languagesTableView;
@property (strong, nonatomic) NSArray *languagesArray;
@property (strong, nonatomic) NSMutableArray *checkMarksArray;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self.languagesTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
self.languagesArray = [NSArray arrayWithObjects:@"English",@"Spanish",@"Russian",@"Arabic",@"Portuguese",@"French",@"German", nil];
self.checkMarksArray = [[NSMutableArray alloc]init];
if( [[NSUserDefaults standardUserDefaults]objectForKey:@"selectedRowsArray"])
{
self.checkMarksArray = [[[NSUserDefaults standardUserDefaults]objectForKey:@"selectedRowsArray"] mutableCopy];
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return self.languagesArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *languagesCell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
languagesCell.textLabel.text = self.languagesArray[indexPath.row];
if([self.checkMarksArray containsObject:[NSNumber numberWithLong:indexPath.row]])
{
languagesCell.accessoryType = UITableViewCellAccessoryCheckmark;
}
else
{
languagesCell.accessoryType = UITableViewCellAccessoryNone;
}
[[NSUserDefaults standardUserDefaults]setObject:self.checkMarksArray forKey:@"selectedRowsArray"];
[[NSUserDefaults standardUserDefaults]synchronize];
return languagesCell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
if([self.checkMarksArray containsObject:[NSNumber numberWithLong:indexPath.row]])
{
[self.checkMarksArray removeObject:[NSNumber numberWithLong:indexPath.row]];
}
else
{
[self.checkMarksArray addObject:[NSNumber numberWithLong:indexPath.row]];
}
[self.languagesTableView reloadData];
}
@end
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