场景:
我在一个UITableView中创建了两个部分,用户需要在每个部分中选择一行,如下面的屏幕截图所示。
预期结果: 1.用户应该能够在每个部分中选择一行
现在的结果: 1.在一个部分中选择了行,然后在第二部分中选择行时,第一个选择消失。
这是我的代码:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Uncheck the previous checked row
long sec=indexPath.section;
if(sec==0){
if(self->checkedIndexPath)
{
UITableViewCell* uncheckCell = [tableView
cellForRowAtIndexPath:self->checkedIndexPath];
uncheckCell.accessoryType = UITableViewCellAccessoryNone;
}
if([self->checkedIndexPath isEqual:indexPath])
{
self->checkedIndexPath = nil;
}
else
{
UITableViewCell* cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
self->checkedIndexPath = indexPath;
}}
if(sec==1){
if(self->checkedIndexPath)
{
UITableViewCell* uncheckCell = [tableView
cellForRowAtIndexPath:self->checkedIndexPath];
uncheckCell.accessoryType = UITableViewCellAccessoryNone;
}
if([self->checkedIndexPath isEqual:indexPath])
{
self->checkedIndexPath = nil;
}
else
{
UITableViewCell* cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
self->checkedIndexPath = indexPath;
}
}
}
帮助表示赞赏。
答案 0 :(得分:1)
这是最简单的方法。 最后我找到了解决方案。它对我有用,希望它对你有用。 声明这些
@interface ViewController ()
{
int selectedsection;
NSMutableArray *selectedindex;
}
替换didSelectRowAtIndexPath,如下所示:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Uncheck the previous checked row
NSIndexPath *selectedIndexPath = [tableView indexPathForSelectedRow];
if(self.checkedIndexPath)
{
for (int i=0; i<[selectedindex count]; i++) {
NSIndexPath *temp= [selectedindex objectAtIndex:i];
if (temp.section==selectedIndexPath.section) {
UITableViewCell* uncheckCell = [tableView
cellForRowAtIndexPath:temp];
uncheckCell.accessoryType = UITableViewCellAccessoryNone;
}
}
NSInteger numb= [tableView numberOfRowsInSection:selectedIndexPath.section];
if (selectedsection==selectedIndexPath.section) {
UITableViewCell* uncheckCell = [tableView
cellForRowAtIndexPath:self.checkedIndexPath];
uncheckCell.accessoryType = UITableViewCellAccessoryNone;
}
}
if([self.checkedIndexPath isEqual:indexPath])
{
for (int i=0; i<[selectedindex count]; i++) {
NSIndexPath *temp= [selectedindex objectAtIndex:i];
if (temp.section==selectedIndexPath.section) {
UITableViewCell* uncheckCell = [tableView
cellForRowAtIndexPath:temp];
uncheckCell.accessoryType = UITableViewCellAccessoryNone;
}
}
self.checkedIndexPath = nil;
}
else
{
for (int i=0; i<[selectedindex count]; i++) {
NSIndexPath *temp= [selectedindex objectAtIndex:i];
if (temp.section==selectedIndexPath.section) {
UITableViewCell* uncheckCell = [tableView
cellForRowAtIndexPath:temp];
uncheckCell.accessoryType = UITableViewCellAccessoryNone;
}
}
UITableViewCell* cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
self.checkedIndexPath = indexPath;
[selectedindex addObject:indexPath];
selectedsection=indexPath.section;
NSLog(@"check");
}
}
答案 1 :(得分:0)
您可以在tableview中启用多项选择:
self.tableView.allowsMultipleSelection = YES;
答案 2 :(得分:0)
我写了一个示例代码,其中复合数据源包含每个部分的数据源对象。听起来很复杂但实际上提供了一个易于扩展的架构。并使您的视图控制器保持较小。
这种方法的优点:
这提供了简单的扩展,并且易于重用。
@import UIKit;
@interface ComoundTableViewDataSource : NSObject
@property (nonatomic,strong, readonly) NSMutableDictionary *internalDictionary;
-(void) setDataSource:(id<UITableViewDataSource>)dataSource forSection:(NSUInteger)section;
-(instancetype)initWithTableView:(UITableView *)tableView;
@end
#import "ComoundTableViewDataSource.h"
@interface ComoundTableViewDataSource () <UITableViewDataSource>
@property (nonatomic,strong, readwrite) NSMutableDictionary *internalDictionary;
@property (nonatomic, weak) UITableView *tableView;
@end
@implementation ComoundTableViewDataSource
-(instancetype)initWithTableView:(UITableView *)tableView
{
self = [super init];
if (self) {
_tableView = tableView;
tableView.dataSource = self;
_internalDictionary = [@{} mutableCopy];
[self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"Cell"];
}
return self;
}
-(void)setDataSource:(id<UITableViewDataSource>)dataSource forSection:(NSUInteger)section
{
self.internalDictionary[@(section)] = dataSource;
[self.tableView reloadData];
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [[self.internalDictionary allKeys] count];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
id<UITableViewDataSource> sectionDataSource = self.internalDictionary[@(section)];
return [sectionDataSource tableView:tableView numberOfRowsInSection:section];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
id<UITableViewDataSource> sectionDataSource = self.internalDictionary[@(indexPath.section)];
return [sectionDataSource tableView:tableView cellForRowAtIndexPath:indexPath];
}
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
id<UITableViewDataSource> sectionDataSource = self.internalDictionary[@(section)];
return [sectionDataSource tableView:tableView titleForHeaderInSection:section];
}
@end
@import UIKit;
@interface SingleSectionDataSource : NSObject <UITableViewDataSource>
@property (nonatomic, strong, readonly) NSArray *array;
@property (nonatomic, strong, readonly) UITableView *tableView;
- (instancetype)initWithArray:(NSArray *)array;
@end
#import "SingleSectionDataSource.h"
@interface SingleSectionDataSource ()
@property (nonatomic, strong, readwrite) NSArray *array;
@property (nonatomic, strong, readwrite) UITableView *tableView;
@end
@implementation SingleSectionDataSource
- (instancetype)initWithArray:(NSArray *)array
{
self = [super init];
if (self) {
self.array = array;
}
return self;
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
self.tableView = tableView;
return self.array.count;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
cell.textLabel.text = self.array[indexPath.row];
return cell;
}
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return [@(section) stringValue];
}
@end
我们从上面扩展类以允许每个部分选择一个
#import "ComoundTableViewDataSource.h"
@interface OnSelectionPerSectionComoundTableViewDataSource : ComoundTableViewDataSource
-(void)selectedCellAtIndexPath:(NSIndexPath *)indexPath;
@end
#import "OnSelectionPerSectionComoundTableViewDataSource.h"
#import "SingleSelectionSingleSectionDataSource.h"
@implementation OnSelectionPerSectionComoundTableViewDataSource
-(instancetype)initWithTableView:(UITableView *)tableView
{
self = [super initWithTableView:tableView];
if(self){
[tableView setAllowsMultipleSelection:YES];
}
return self;
}
-(void)selectedCellAtIndexPath:(NSIndexPath *)indexPath
{
SingleSelectionSingleSectionDataSource *sectionDataSource = self.internalDictionary[@(indexPath.section)];
[sectionDataSource selectedCellAtIndexPath:indexPath];
}
@end
正如所承诺的,一个非常苗条的视图控制器:
@interface ViewController () <UITableViewDelegate>
@property (weak, nonatomic) IBOutlet UITableView *tableView;
@property (nonatomic, strong) OnSelectionPerSectionComoundTableViewDataSource *tableViewDataSource;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.tableViewDataSource = [[OnSelectionPerSectionComoundTableViewDataSource alloc] initWithTableView:self.tableView];
self.tableView.delegate = self;
[self.tableViewDataSource setDataSource:[[SingleSelectionSingleSectionDataSource alloc] initWithArray:@[@"Hallo", @"Welt"]] forSection:0];
[self.tableViewDataSource setDataSource:[[SingleSelectionSingleSectionDataSource alloc] initWithArray:@[@"Hello", @"World", @"!"]] forSection:1];
[self.tableViewDataSource setDataSource:[[SingleSelectionSingleSectionDataSource alloc] initWithArray:@[@"Hola", @"Mundo", @"!", @"¿Que tal?"]] forSection:2];
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self.tableViewDataSource selectedCellAtIndexPath:indexPath];
}
@end
您需要向数据源添加方法以获取所选行。
举例:https://github.com/vikingosegundo/CompoundDatasourceExample
注意 此代码存在单元重用问题。它固定在GitHub上。