ios – 当用户多次加载视图时,在uitableview上保存附件复选标记

所以我实现了一个带有tableview的UIViewController,基本上它作为我的uicollectionview的一组“过滤器”加载.

现在,当我点击tableview中的复选标记时,它会相应地“过滤”我的单元格,但现在当我再次重新加载视图时,我想显示我使用过的最新“复选标记”或“过滤器”.

我已经看到这是用NSUserDefaults实现的,但我无法成功实现它.

如果有人能帮助我,我将不胜感激.

码

FiltersViewController.m：

#import "FiltersViewController.h"

@interface FiltersViewController ()

@property (nonatomic,strong) NSMutableSet *selectedRowObjects;
//@property (nonatomic,strong) NSArray *filters;

@end

@implementation FiltersViewController


- (void)viewDidLoad
{
    [super viewDidLoad];

    self.selectedRowObjects = [NSMutableSet setWithCapacity:10];
}

- (IBAction)filteRSSelected:(id)sender {
    [self.delegate filteRSSelected:self.selectedRowObjects];
}

- (IBAction)cancelFilterSelection:(id)sender {
    [self.delegate filterSelectionCancelled];
}

- (Nsstring *)getKeyForIndex:(int)index
{
    return [Nsstring stringWithFormat:@"KEY%d",index];
}

- (BOOL) getCheckedForIndex:(int)index
{
    if([[[NSUserDefaults standardUserDefaults] valueForKey:[self getKeyForIndex:index]] boolValue]==YES)
    {
        return YES;
    }
    else
    {
        return NO;
    }
}

- (void) checkedCellAtIndex:(int)index
{
    BOOL boolChecked = [self getCheckedForIndex:index];

    [[NSUserDefaults standardUserDefaults] setValue:[NSNumber numberWithBool:!boolChecked] forKey:[self getKeyForIndex:index]];
    [[NSUserDefaults standardUserDefaults] synchronize];
}


#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 10;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"filter" forIndexPath:indexPath];
    cell.textLabel.text = [Nsstring stringWithFormat:@"%u",indexPath.row];



    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {


    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    Nsstring *obj = cell.textLabel.text;

    if (cell.accessoryType == UITableViewCellAccessorycheckmark) {
        cell.accessoryType = UITableViewCellAccessoryNone;
        [self.selectedRowObjects removeObject:obj];
    }
    else {
        cell.accessoryType = UITableViewCellAccessorycheckmark;
        [self.selectedRowObjects addobject:obj];
    }

    [tableView deselectRowAtIndexPath:indexPath animated:YES];

}
@end

解决方法

你还需要检查cellForRowAtIndexPath.在此编写此代码

if([[NSUserDefaults standardUserDefaults] objectForKey:[self getKeyForIndex:indexPath.row]])
{
    cell.accessoryType = UITableViewCellAccessorycheckmark;
}
else
{
    cell.accessoryType = UITableViewCellAccessoryNone;
}

是的,不要忘记在didSelectRowAtIndexPath中调用此方法

[self checkedCellAtIndex:indexPath.row];

请享用.