防止父视图 UIGestureRecongnizer 在 UITableVIew 子视图中执行

Posted 2023-03-13

【中文标题】防止父视图 UIGestureRecongnizer 在 UITableVIew 子视图中执行

【英文标题】：Preventing parent views UIGestureRecongnizer executing within a UITableVIew subview

【发布时间】：2012-10-10 09:49:05

【问题描述】：

问题：

我有一个UIView，它有一个UITableView 作为子视图。 UIView 配置了UITapGestureRecognizer。

我的问题是 UIView 的手势识别器会消耗桌面上的点击。结果是表格视图永远不会看到水龙头。

当一个点在表格的框架内时，如何让识别器失败，或者让表格成为点击的默认使用者。

我已经尝试（如代码示例所示）多种方法pointInside:withEvent、hitTest:withEvent，但不知道该怎么做。

这是代表问题的代码： 控制器：

#import <UIKit/UIKit.h>
#import "ABCDTableView.h"

@interface ABCDFirstView : UIView
@property (nonatomic,strong) ABCDTableView *tableView;
@end

#import "ABCDFirstView.h"

@implementation ABCDFirstView
@synthesize tableView;

- (id)initWithFrame:(CGRect)frame

    self = [super initWithFrame:frame];
    if (self) 
        [self awakeFromNib];
    
    return self;


- (void)awakeFromNib


    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
                                   initWithTarget:self action:@selector(viewTouch:)];

    [self addGestureRecognizer:tap];


- (void)viewTouch:(UIGestureRecognizer *)gesture 
    NSLog(@"view touched");



- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event

    if (CGRectContainsPoint(self.tableView.bounds, point)) 
        NSLog(@"point in table point as well as view");
        return NO;
    
    else if (CGRectContainsPoint(self.bounds, point)) 
        NSLog(@"point only in view");
        return YES;
    
    NSLog(@"point not in view");
    return NO;



- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event

    UIView *view    = [super hitTest:point withEvent:event];
    NSLog(@"view hittest res: %@",view);

    return view;

@end

表格视图

#import <UIKit/UIKit.h>

@interface ABCDTableView : UITableView
    <UITableViewDataSource, UITableViewDelegate>
@property (nonatomic, strong) NSArray *list;


@end



#import "ABCDTableView.h"

@implementation ABCDTableView
@synthesize list;

- (id)initWithFrame:(CGRect)frame

    self = [super initWithFrame:frame];
    if (self) 
        [self awakeFromNib];
    
    return self;


- (void)awakeFromNib

    self.delegate   = self;
    self.dataSource = self;

    // create table list
    self.list       = [[NSArray alloc]
                       initWithObjects: @"one",@"two",@"three",@"four",@"five",
                       @"six", @"seven", @"eight", @"nine", @"ten", nil];





- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

    return [self.list count];


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

    static NSString *cellID = @"cell";
    UITableViewCell *cell   = [self dequeueReusableCellWithIdentifier:cellID];

    if (cell == nil) 
        cell    = [[UITableViewCell alloc]
                   initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
    

    cell.textLabel.text = [self.list objectAtIndex:[indexPath row]];

    return cell;


- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

    NSLog(@"row selected");



@end

查看

#import <UIKit/UIKit.h>
#import "ABCDTableView.h"

@interface ABCDFirstView : UIView
@property (nonatomic,strong) ABCDTableView *tableView;
@end

#import "ABCDFirstView.h"

@implementation ABCDFirstView
@synthesize tableView;

- (id)initWithFrame:(CGRect)frame

    self = [super initWithFrame:frame];
    if (self) 
        [self awakeFromNib];
    
    return self;


- (void)awakeFromNib


    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
                                   initWithTarget:self action:@selector(viewTouch:)];

    [self addGestureRecognizer:tap];


- (void)viewTouch:(UIGestureRecognizer *)gesture 
    NSLog(@"view touched");



- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event

    if (CGRectContainsPoint(self.tableView.bounds, point)) 
        NSLog(@"point in table point as well as view");
        return NO;
    
    else if (CGRectContainsPoint(self.bounds, point)) 
        NSLog(@"point only in view");
        return YES;
    
    NSLog(@"point not in view");
    return NO;



- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event

    UIView *view    = [super hitTest:point withEvent:event];
    NSLog(@"view hittest res: %@",view);

    return view;

@end

【参考方案1】：

使用 UIGestureRecognizerDelegate 方法

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch;

并检查 touch.view 是否与应该接收手势识别器的视图相同。