当用户多次加载视图时，在uitableview上保存附件复选标记 [英] Save accessory checkmarks on uitableview when users loads view multiple times

问题描述

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。

So I've implemented a UIViewController with a tableview, and basically it loads as a set of "filters" for my uicollectionview.

现在，当我点击在我的tableview中的复选标记，它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。

Now, when I click on the checkmarks in my tableview, it "filters" my cells accordingly, but now when I reload the view again I want to display the most recent "checkmarks" I've used, or "filters."

我已经看到这是用NSUserDefaults实现的，但是我无法成功实现它。

I have seen this being implemented with NSUserDefaults, but I have not been able to successfully implement this.

如果有人可以帮助我，那将是非常感谢。

If anyone could help me, that will be greatly appreciated.

代码

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

推荐答案

您还需要检查cellForRowAtIndexPath。将此代码写入此

you need to check in cellForRowAtIndexPath also. Write this code in this

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

And yes don't forget to call this method in didSelectRowAtIndexPath

[self checkedCellAtIndex:indexPath.row];

享受。

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