저는 iOS 개발 초보자입니다. UITableViewCell
선택시 확인 표시를 추가하고 싶습니다 . 다른 행을 선택하면 확인 표시를 제거해야합니다. 어떻게해야합니까?
답변:
[tableview reloadData];
// 망치를 사용하지 마십시오 .
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryCheckmark;
}
-(void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryNone;
}
UITableViewDatasource 메서드에서 :
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil )
{
cell =[[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
if ([indexPath compare:self.lastIndexPath] == NSOrderedSame)
{
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
else
{
cell.accessoryType = UITableViewCellAccessoryNone;
}
return cell;
}
// UITableView Delegate Method
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
self.lastIndexPath = indexPath;
[tableView reloadData];
}
그리고 lastIndexPath는 property(strong) NSIndexPath* lastIndexPath;
데이터를 다시로드하면 추악한 방식으로 선택 해제 애니메이션이 중단된다는 것을 알았습니다.
이 Swift 구현은 확인 표시를 깔끔하게 추가 / 제거하고 행을 선택 취소합니다.
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
if self.lastSelection != nil {
self.myTableView.cellForRowAtIndexPath(self.lastSelection)?.accessoryType = .None
}
self.myTableView.cellForRowAtIndexPath(indexPath)?.accessoryType = .Checkmark
self.lastSelection = indexPath
self.myTableView.deselectRowAtIndexPath(indexPath, animated: true)
}
어디로 lastSelection
선언var lastSelection: NSIndexPath!
추가 활동이 cellForRowAtIndexPath
필요하지 않습니다. Obj-C에서 복제하기가 어렵지 않아야합니다.
확인 표시를 설정하려면 :
UITableViewCell *cell = ...;
cell.accessoryType = UITableViewCellAccessoryCheckmark;
셀을 선택 / 선택 취소하려면 :
[cell setSelected:TRUE animated:TRUE]; // select
[cell setSelected:FALSE animated:TRUE]; // deselect
이전 셀을 선택 취소하려면 NSIndexPath * lastSelected ivar를 사용하여 마지막으로 선택한 셀을 추적합니다.
- (void)tableView:(UITableView*)tableView didSelectRowAtIndexPath:(NSIndexPath*)indexPath
{
if (self.lastSelected==indexPath) return; // nothing to do
// deselect old
UITableViewCell *old = [self.tableView cellForRowAtIndexPath:self.lastSelected];
old.accessoryType = UITableViewCellAccessoryNone;
[old setSelected:FALSE animated:TRUE];
// select new
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
[cell setSelected:TRUE animated:TRUE];
// keep track of the last selected cell
self.lastSelected = indexPath;
}
Swift 4 업데이트
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
tableView.cellForRow(at: indexPath)?.accessoryType = .none
}
extension ViewController : UITableViewDelegate,UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.dataArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = dataArray[indexPath.row]
if selectedData.contains(dataArray[indexPath.row]) {
cell.accessoryType = .checkmark
}else{
cell.accessoryType = .none
}
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if selectedData.contains(dataArray[indexPath.row]) {
selectedData.removeLast()
tableView.cellForRow(at: indexPath)?.accessoryType = .none
}else {
selectedData.removeAll()
selectedData.append(dataArray[indexPath.row])
tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
print(selectedData)
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
tableView.cellForRow(at: indexPath)?.accessoryType = .none
}
}
생성 된 dataArray 테이블 뷰를 기반으로 .. 유사하게 빈 배열을 취했고 사용자가 셀을 탭할 때마다 dataArray의 indexValue를 기반으로 해당 객체를 selectedDataArray에 저장했습니다.
질문에 관해서는 ... 질문에는 여러 옵션 (답변)이 있지만 결국 하나의 답변 만 결과가됩니다.
마찬가지로, 하나의 셀에만 체크 표시가 나타나야하고 나머지 셀은 선택되지 않아야합니다. 어떤 경우에는 답변을 선택 취소 할 수 있습니다.이 질문에 대한 최선의 답변이 되었기를 바랍니다.
Swift 4.2 및 Swift 5 사용 TableView에서 선택한 행에 대해서만 체크 표시의 작동 코드
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
self.tableView.cellForRow(at: indexPath)?.accessoryType = .none
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
//print(self.coloursArray[indexPath.row])
self.tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
에서 상속받은 클래스에 있다고 가정하면 UITableViewController
Swift 3에서 트릭을 수행합니다.
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// Add a visual cue to indicate that the cell was selected.
self.tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
override func tableView(_ tableView: UITableView, willSelectRowAt indexPath: IndexPath) -> IndexPath? {
// Invoked so we can prepare for a change in selection.
// Remove previous selection, if any.
if let selectedIndex = self.tableView.indexPathForSelectedRow {
// Note: Programmatically deslecting does NOT invoke tableView(:didSelectRowAt:), so no risk of infinite loop.
self.tableView.deselectRow(at: selectedIndex, animated: false)
// Remove the visual selection indication.
self.tableView.cellForRow(at: selectedIndex)?.accessoryType = .none
}
return indexPath
}
사용자 정의 UITableViewCell 구현 내에서 액세서리를 설정하는 것이 더 깨끗하다고 생각합니다. 신속하게 다음을 사용했습니다.
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
accessoryType = selected ? .checkmark : .none
}
작은 오타
// deselect old
UITableViewCell *old = [self.tableView cellForRowAtIndexPath:self.lastSelected];
cell.accessoryType = UITableViewCellAccessoryNone;
[cell setSelected:FALSE animated:TRUE];
읽어야합니다
// deselect old
UITableViewCell *old = [self.tableView cellForRowAtIndexPath:self.lastSelected];
old.accessoryType = UITableViewCellAccessoryNone;
[old setSelected:FALSE animated:TRUE];
그리고 또한
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.row == [previouslySelected intValue])
{
cell.accessoryType = UITableViewCellAccessoryCheckmark;
selectedIndex = indexPath;
[cell setSelected:YES animated:YES];
}
else
{
cell.accessoryType = UITableViewCellAccessoryNone;
[cell setSelected:NO animated:YES];
}
}
여기서 previousSelected 는 로컬 ivar 등입니다. 그런 식으로 선택한 인덱스로 다시로드하면 가능한 선택 항목을 넘길 때 선택 해제됩니다.
많은 수의 데이터에 셀을 재사용하면 위의 답변이 작동하지 않습니다. 스크롤에서 반복되는 체크 표시를 볼 수 있습니다. 아래 단계를 사용하지 않으려면 :
변수 선언 : var indexNumber : NSInteger = -1
cellforRowAtIndexPath에 아래 코드를 추가하십시오.
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
if indexNumber == indexPath.row{
cell.accessoryType = .checkmark
}else{
cell.accessoryType = .none
}
}
그리고 didselectAtIndexpath에서 아래 코드를 추가하십시오.
func tableView (_ tableView : UITableView, didSelectRowAt indexPath : IndexPath) {재정의
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.cellForRow(at: indexPath as IndexPath)?.accessoryType = .checkmark
indexNumber = indexPath.row
}
override func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
tableView.cellForRow(at: indexPath as IndexPath)?.accessoryType = .none
}
다른 방향에서이 문제에 직면하는 것이 좋습니다. 내부 UIKit 메커니즘에 대한 모든 작업을 수행하고 구현을 UITableViewCell로 이동합니다.
@implementation MYTableViewCell
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
self.accessoryType = selected ? UITableViewCellAccessoryCheckmark : UITableViewCellAccessoryNone;
}
- (void)prepareForReuse {
[super prepareForReuse];
self.accessoryType = UITableViewCellAccessoryNone;
}
@end
didSelectRowAtIndexPath
체크 표시를 표시 할 행을 선택하고 체크 표시를 숨기려면 체크 표시 행을 선택하면 메서드를 호출 하면됩니다.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath: (NSIndexPath *)indexPath {
[tableView deselectRowAtIndexPath:indexPath animated:true];
NSLog(@"touch");
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
if (cell.accessoryType == UITableViewCellAccessoryNone)
{
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
else
{
cell.accessoryType = UITableViewCellAccessoryNone;
}
}
필요한 경우 신속한 4.
var lastSelection: NSIndexPath!
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
//CHECK MARK THE CELL
if self.lastSelection != nil {
self.tableView.cellForRow(at: self.lastSelection as IndexPath)?.accessoryType = .none
}
self.tableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
self.lastSelection = indexPath as NSIndexPath
self.tableView.deselectRow(at: indexPath, animated: true)
}
두 가지 방법이 있습니다. 하나는 다중 선택이없는 것이고 다른 하나는 다중 선택이있는 것입니다.
// Table View Controller -- without Multiple Selection
// Step 1
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if(tableView.cellForRow(at: indexPath)?.imageView?.image == UIImage(systemName:"checkmark.circle")) {
tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"circle")
} else {
tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"checkmark.circle")
}
}
//Step 2
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
cell.textLabel?.text = employeeValues[indexPath.row]
cell.imageView?.image = UIImage(systemName:"circle")
return cell
}
// Table View Controller -- with Multiple Selection
@IBOutlet var myTableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
self.myTableView.allowsMultipleSelection = true
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
cell.textLabel?.text = employeeValues[indexPath.row]
cell.imageView?.image = UIImage(systemName:"circle")
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// let cell = tableView.cellForRow(at: indexPath)?.accessoryType = UITableViewCell.AccessoryType.checkmark
tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"checkmark.circle")
}
override func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
tableView.cellForRow(at: indexPath)?.imageView?.image = UIImage(systemName:"circle")
}
위에서 언급 한 코드는 단일 선택 에서만 작동합니다. 다음 코드는 여러 선택에 대해 확실히 작동합니다 .
- (void)viewDidLoad {
arrSelectionStatus =[NSMutableArray array]; //arrSelectionStatus holds the cell selection status
for (int i=0; i<arrElements.count; i++) { //arrElements holds those elements which will be populated in tableview
[arrSelectionStatus addObject:[NSNumber numberWithBool:NO]];
}
}
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
if (cell==nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
}
cell.textLabel.text=[arrElements objectAtIndex:indexPath.row];
if ([[arrSelectionStatus objectAtIndex:indexPath.row] boolValue] == YES)
cell.accessoryType = UITableViewCellAccessoryCheckmark;
else
cell.accessoryType = UITableViewCellAccessoryNone;
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
[arrSelectionStatus replaceObjectAtIndex:indexPath.row withObject:[NSNumber numberWithBool:YES]];
}
-(void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryNone;
[arrSelectionStatus replaceObjectAtIndex:indexPath.row withObject:[NSNumber numberWithBool:NO]];
}
선택한 셀 (체크 표시가 다시 선택됨)이 선택되면 선택 항목을 제거하기 만하면됩니다.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath*)indexPath
{
BOOL isSelected = ([tableView cellForRowAtIndexPath:indexPath].accessoryType == UITableViewCellAccessoryCheckmark);
if(isSelected){
[tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryNone;
[tableView deselectRowAtIndexPath:indexPath animated:YES]; //this won't trigger the didDeselectRowAtIndexPath, but it's always a good idea to remove the selection
}else{
[tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryCheckmark;
}
}
- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath*)indexPath
{
[tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryNone;
}
보너스:
self.tableView.indexPathForSelectedRow
선택한 셀의 indexPath를 감지하는 데 사용