ios - UITableViewCell - 每个部分勾选一行

Question

我有 2 个部分和 3 行，如下所示:

1. 搜索距离

   • 250 英尺

   • 1000 英尺

   • 4000 英尺

2. map 类型

   • 标准

   • 卫星

   • 混合

我希望每个部分的一行有一个复选标记，但我当前的代码将取消选中整个 TableView 的所有可见单元格，并保留一个选定的行带有复选标记。换句话说，我将为整个表格(2 个部分)打一个复选标记。在这里，我发布了我的整个代码。我用谷歌搜索了很多，但似乎没有一个可以解决我的问题。任何人，请帮助更正我的代码。提前致谢。

#import "PAWSettingsViewController.h"
#import "PAWAppDelegate.h"
#import <Parse/Parse.h>

@interface PAWSettingsViewController ()

- (NSString *)distanceLabelForCell:(NSIndexPath *)indexPath;
- (PAWLocationAccuracy)distanceForCell:(NSIndexPath *)indexPath;


- (NSString *)maptypeLabelForCell:(NSIndexPath *)indexPath;
- (PAWMaptypeSelect)maptypeForCell:(NSIndexPath *)indexPath;

@property (nonatomic, assign) CLLocationAccuracy filterDistance;

@end



typedef enum {
    kPAWSettingsTableViewDistance = 0,
    kPAWSettingsTableViewMaptype,
    kPAWSettingsTableViewNumberOfSections
} kPAWSettingsTableViewSections;


typedef enum {
    kPAWSettingsTableViewDistanceSection250FeetRow = 0,
    kPAWSettingsTableViewDistanceSection1000FeetRow,
    kPAWSettingsTableViewDistanceSection4000FeetRow,
    kPAWSettingsTableViewDistanceNumberOfRows
} kPAWSettingsTableViewDistanceSectionRows;

typedef enum {
    kPAWSettingsTableViewMaptypeSectionStandardRow = 0,
    kPAWSettingsTableViewMaptypeSectionSatelliteRow,
    kPAWSettingsTableViewMaptypeSectionHybridRow,
    kPAWSettingsTableViewMaptypeNumberOfRows
} kPAWSettingsTableViewMaptypeSectionRows;


@implementation PAWSettingsViewController

@synthesize tableView;
@synthesize filterDistance;


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
        PAWAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
        self.filterDistance = appDelegate.filterDistance;
    }
    return self;
}


#pragma mark - Custom setters

// Always fault our filter distance through to the app delegate. We just cache it locally because it's used in the tableview's cells.
- (void)setFilterDistance:(CLLocationAccuracy)aFilterDistance {
    PAWAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
    appDelegate.filterDistance = aFilterDistance;
    filterDistance = aFilterDistance;
}

#pragma mark - View lifecycle

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

#pragma mark - Private helper methods

- (NSString *)distanceLabelForCell:(NSIndexPath *)indexPath {
    NSString *cellText = nil;
    switch (indexPath.row) {
        case kPAWSettingsTableViewDistanceSection250FeetRow:
            cellText = @"250 feet";
            break;
        case kPAWSettingsTableViewDistanceSection1000FeetRow:
            cellText = @"1000 feet";
            break;
        case kPAWSettingsTableViewDistanceSection4000FeetRow:
            cellText = @"4000 feet";
            break;
        case kPAWSettingsTableViewDistanceNumberOfRows: // never reached.
        default:
            cellText = @"The universe";
            break;
    }
    return cellText;
}

- (PAWLocationAccuracy)distanceForCell:(NSIndexPath *)indexPath {
    PAWLocationAccuracy distance = 0.0;
    switch (indexPath.row) {
        case kPAWSettingsTableViewDistanceSection250FeetRow:
            distance = 250;
            break;
        case kPAWSettingsTableViewDistanceSection1000FeetRow:
            distance = 1000;
            break;
        case kPAWSettingsTableViewDistanceSection4000FeetRow:
            distance = 4000;
            break;
        case kPAWSettingsTableViewDistanceNumberOfRows: // never reached.
        default:
            distance = 10000 * kPAWFeetToMiles;
            break;
    }

    return distance;
}

- (NSString *)maptypeLabelForCell:(NSIndexPath *)indexPath {
    NSString *cellText = nil;
    switch (indexPath.row) {
        case kPAWSettingsTableViewMaptypeSectionStandardRow:
            cellText = @"Standard";
            break;
        case kPAWSettingsTableViewMaptypeSectionSatelliteRow:
            cellText = @"Satellite";
            break;
        case kPAWSettingsTableViewMaptypeSectionHybridRow:
            cellText = @"Hybrid";
            break;
        case kPAWSettingsTableViewMaptypeNumberOfRows: // never reached.
        default:
            cellText = @"?";
            break;
    }
    return cellText;
}

- (PAWMaptypeSelect)maptypeForCell:(NSIndexPath *)indexPath {
    PAWMaptypeSelect maptype = nil;
    switch (indexPath.row) {
        case kPAWSettingsTableViewMaptypeSectionStandardRow:
            maptype = @"Standard";
            break;
        case kPAWSettingsTableViewMaptypeSectionSatelliteRow:
            maptype = @"Satellite";
            break;
        case kPAWSettingsTableViewMaptypeSectionHybridRow:
            maptype = @"Hybrid";
            break;
        case kPAWSettingsTableViewMaptypeNumberOfRows: // never reached.
        default:
            maptype = nil;
            break;
    }

    return maptype;
}

#pragma mark - UINavigationBar-based actions

- (IBAction)done:(id)sender {
    [self.presentingViewController dismissModalViewControllerAnimated:YES];
}

#pragma mark - UITableViewDataSource methods

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

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    switch ((kPAWSettingsTableViewSections)section) {
        case kPAWSettingsTableViewDistance:
            return kPAWSettingsTableViewDistanceNumberOfRows;
            break;

        case kPAWSettingsTableViewMaptype:
            return kPAWSettingsTableViewMaptypeNumberOfRows;
            break;

        case kPAWSettingsTableViewNumberOfSections:
            return 2;
            break;
    };
}

- (UITableViewCell *)tableView:(UITableView *)aTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *identifier = @"SettingsTableView";
    if (indexPath.section == kPAWSettingsTableViewDistance) {
        UITableViewCell *cell = [aTableView dequeueReusableCellWithIdentifier:identifier];
        if ( cell == nil )
        {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue2 reuseIdentifier:identifier];

        }

        // Configure the cell.
        cell.textLabel.text = [self distanceLabelForCell:indexPath];

        if (self.filterDistance == 0.0) {
            NSLog(@"We have a zero filter distance!");
        }

        PAWLocationAccuracy filterDistanceInFeet = self.filterDistance * ( 1 / kPAWFeetToMeters);
        PAWLocationAccuracy distanceForCell = [self distanceForCell:indexPath];
        if (abs(distanceForCell - filterDistanceInFeet) < 0.001 ) {
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
        } else {
            cell.accessoryType = UITableViewCellAccessoryNone;
        }


        return cell;
    }

    else if (indexPath.section == kPAWSettingsTableViewMaptype){
        UITableViewCell *cell = [aTableView dequeueReusableCellWithIdentifier:identifier];
        if ( cell == nil )
        {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue2 reuseIdentifier:identifier];
        }

        // Configure the cell.
        cell.textLabel.text = [self maptypeLabelForCell:indexPath];


        return cell;

    }


    else {
        return nil;
    }
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    switch ((kPAWSettingsTableViewSections)section) {
        case kPAWSettingsTableViewDistance:
            return @"Search Distance";
            break;

        case kPAWSettingsTableViewMaptype:
            return @"Map Type";
            break;

        case kPAWSettingsTableViewNumberOfSections:
            return @"";
            break;
    }
}

#pragma mark - UITableViewDelegate methods

// Called after the user changes the selection.
- (void)tableView:(UITableView *)aTableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {


    if (indexPath.section == kPAWSettingsTableViewDistance) {
        [aTableView deselectRowAtIndexPath:indexPath animated:YES];



        // if we were already selected, bail and save some work.
        UITableViewCell *selectedCell = [aTableView cellForRowAtIndexPath:indexPath];
        if (selectedCell.accessoryType == UITableViewCellAccessoryCheckmark) {
            return;
        }


        // uncheck all visible cells.
        for (UITableViewCell *cell in [aTableView visibleCells]) {
            if (cell.accessoryType != UITableViewCellAccessoryNone) {
                cell.accessoryType = UITableViewCellAccessoryNone;
            }
        }


        selectedCell.accessoryType = UITableViewCellAccessoryCheckmark;

        PAWLocationAccuracy distanceForCellInFeet = [self distanceForCell:indexPath];
        self.filterDistance = distanceForCellInFeet * kPAWFeetToMeters;
    }



    else if (indexPath.section == kPAWSettingsTableViewMaptype){
        [aTableView deselectRowAtIndexPath:indexPath animated:YES];

        // if we were already selected, bail and save some work.
        UITableViewCell *selectedCell = [aTableView cellForRowAtIndexPath:indexPath];
        if (selectedCell.accessoryType == UITableViewCellAccessoryCheckmark) {
            return;
        }

        // uncheck all visible cells.
        for (UITableViewCell *cell in [aTableView visibleCells]) {
            if (cell.accessoryType != UITableViewCellAccessoryNone) {
                cell.accessoryType = UITableViewCellAccessoryNone;
            }
        }

        selectedCell.accessoryType = UITableViewCellAccessoryCheckmark;

        PAWMaptypeSelect maptypeForCell = [self maptypeForCell:indexPath];

    }

}


@end

Answer 1

你有一个错误

//取消选中所有可见单元格。

    for (UITableViewCell *cell in [aTableView visibleCells]) {
        if (cell.accessoryType != UITableViewCellAccessoryNone) {
            cell.accessoryType = UITableViewCellAccessoryNone;
        }
    }

此处的 for 循环取消选择所有单元格。您还必须检查 if 循环中的部分

你可以像这样为你的单元格设置标签

 cell.tag = indexPath.section;

如果条件是，则在 for 循环中

    for (UITableViewCell *cell in [aTableView visibleCells]) {
        if (cell.accessoryType != UITableViewCellAccessoryNone && cell.tag == indexPath.section) {
            cell.accessoryType = UITableViewCellAccessoryNone;
        }
    }