ios 手势冲突解决的三种常用场景

场景一、tableviewcell可以触发点击，同时tableview的父视图有点击识别，cell的点击会很难被识别到

解决1：方法在GestureRecgnizer代理方法里面区分手势。
解决2：在cell上再添加一个手势识别，这样会先识别cell上面的手势

- (void)viewDidLoad {
    [super viewDidLoad];
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)];
    tap.delegate = self;
    [self.view addGestureRecognizer:tap];
}


#pragma mark tapGestureRecgnizerdelegate 解决手势冲突
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
if ([touch.view isKindOfClass:[UITableView class]]){
    return NO;
}
if ([NSStringFromClass([touch.view class]) isEqualToString:@"UITableViewCellContentView"]) {
    return NO;
}
return YES;
}

场景2：禁用右滑返回

解决1：

-(void)viewDidAppear:(BOOL)animated{
    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
        self.navigationController.interactivePopGestureRecognizer.enabled = NO;
    }
}
    
-(void)viewWillDisappear:(BOOL)animated{
    self.navigationController.interactivePopGestureRecognizer.enabled = YES;
}

解决2：流程：先设置代理---->重写手势操作方法,

-(void)viewDidAppear:(BOOL)animated{
    self.navigationController.interactivePopGestureRecognizer.delegate = self;
}
-(void)viewWillDisappear:(BOOL)animated{
    self.navigationController.interactivePopGestureRecognizer.delegate = nil;
}
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer
                                      *)gestureRecognizer{
    return NO; //YES：允许右滑返回  NO：禁止右滑返回
}

场景3、requireGestureRecognizerToFail，指定某一个 recognizer，即便自己已经滿足條件了，也不會立刻触发，会等到该指定的 recognizer 确定失败之后才触发。

    UITapGestureRecognizer* singleRecognizer;
    singleRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTapFrom)];
    singleRecognizer.numberOfTapsRequired = 1; // 单击
    [self.view addGestureRecognizer:singleRecognizer];
    
    // 双击的 Recognizer
    UITapGestureRecognizer* doubleRecognizer;
    doubleRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTapFrom)];
    doubleRecognizer.numberOfTapsRequired = 2; // 双击
    [self.view addGestureRecognizer:doubleRecognizer];
    
    // 关键在这一行，如果双击确定偵測失败才會触发单击
    [singleRecognizer requireGestureRecognizerToFail:doubleRecognizer];