Question

我有一个显示自定义视图单元格的tableview。在viewWillAppear中，我设置了一个位于UITableView上的长按手势识别器。我的长按是开始并显示有关长按的细胞的信息。然而，当我放开按下时，didSelectRowAtIndexPath方法正在触发。有没有办法在长按激发后取消触摸，以便选择行不会被触发？

我见过didSelectRowAtIndexPath called after long press，这个问题似乎没有足够的答案来解决问题。

@implementation ViewController
UILongPressGestureRecognizer *lpgr;
.
.
.

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];

    // setup long press

    lpgr = [[UILongPressGestureRecognizer alloc]
                                          initWithTarget:self action:@selector(handleLongPress:)];
    lpgr.minimumPressDuration = 0.5; //seconds
    lpgr.delegate = self;
    lpgr.cancelsTouchesInView = true;
    [self.myTableview addGestureRecognizer:lpgr];
    [self.myTableview.panGestureRecognizer requireGestureRecognizerToFail:lpgr]; ...
.
.
.

-(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer
{

    if (gestureRecognizer.state == UIGestureRecognizerStateBegan) {

        CGPoint p = [gestureRecognizer locationInView:self.myTableview];

        NSIndexPath *indexPath = [self.myTableview indexPathForRowAtPoint:p];
        if (indexPath == nil) {
            NSLog(@"long press on table view but not on a row");
        } else {
            UITableViewCell *cell = [self.myTableview cellForRowAtIndexPath:indexPath];
            CensusData *currentUser;
            if(self.isFiltered){
                currentUser = (CensusData*)[self.filteredTableData objectAtIndex:indexPath.row];
            }else{
                currentUser = (CensusData*)[self.dataArray objectAtIndex:indexPath.row];
            }
            NSLog(@"CURRENT ROW WITH LONG PRESS: %@", currentUser.friendlyName);

        }
    }
}
.
.
.

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    return YES;
}

Answer 1

当手势处于活动状态（已开始但尚未结束）时，禁用表格视图上的选择...

- (void)handleLongPress:(UILongPressGestureRecognizer *)gr {
    if (gr.state == UIGestureRecognizerStateBegan) {
        self.myTableview.allowsSelection = NO;
    } else if (gr.state == UIGestureRecognizerStateEnded) {
        self.myTableview.allowsSelection = YES;
    }
}

无需设置委托，设置cancelsTouches或实现shouldRecognize ...（除非您需要其他内容）。

编辑此vc是一项最低限度的完整测试。它需要一个故事板，其中一个表视图连接到插座，而vc作为数据源和委托......

#import "ViewController.h"

@interface ViewController () <UITableViewDataSource, UITableViewDelegate>
@property(weak,nonatomic) IBOutlet UITableView *tableView;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    UILongPressGestureRecognizer *gr = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
    [self.tableView addGestureRecognizer:gr];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 50;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
    cell.textLabel.text = [NSString stringWithFormat:@"Row %ld", indexPath.row];
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"selected %@", indexPath);
}

- (void)handleLongPress:(UILongPressGestureRecognizer *)gr {
    if (gr.state == UIGestureRecognizerStateBegan) {
        NSLog(@"long press began");
        self.tableView.allowsSelection = NO;
    } else if (gr.state == UIGestureRecognizerStateEnded) {
        NSLog(@"long press ended");
        self.tableView.allowsSelection = YES;
    }
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Answer 2

您可以禁用tableview，然后只有longGesture正常工作

 <form id="form1" runat="server">
    <noscript>
        <div>
            You must enable javascript to continue.
        </div>
    </noscript>
    <div>
        <asp:Label ID="lblLabel" runat="server"></asp:Label>
        <button id="btn_do" type="button">toggle</button>
    </div>
    <div></div>
    <div id="divchatID" class="div_chat" style="height: 500px; width: 500px; background-color: #82adf2; display: none; padding:5px;">
        <label id="lblvalue1">Value 1</label>
        <input id="value1" type="text" onkeypress='return event.charCode >= 48 && event.charCode <= 57' />
        <br />
        <label id="lblvalue2">Value 2</label>
        <input id="value2" type="text" onkeypress='return event.charCode >= 48 && event.charCode <= 57' />
        <button id="btnplus" type="button" > ADD</button>
        <br />
        <asp:Label ID="lbltext" runat="server">tesst</asp:Label>
    </div>
</form>

长按后如何取消触摸？

2 个答案: