83.手势过滤和手势屏蔽

如何屏蔽指定区域利用 tap 手势, 利用 tap 手势, 在其代理方法中进行区域限制, 然后根据需要返回 YES / NO

#import "ViewController.h"

@interface ViewController ()<UIGestureRecognizerDelegate>
@property (weak, nonatomic) IBOutlet UIView *bottomView;

@end

@implementation ViewController

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

}

- (void)tapEvent
{
NSLog(@"点击了我");
}
//屏蔽某些位置点击是否可用
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
if ([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {
CGPoint position = [touch locationInView:_bottomView];
//屏蔽手势
if (position.x < 150) {
return NO;
}
}
return YES;
}

另外在公开 API 中 , GestureRecognizer总共6个代理方法, 如下:

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

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
return YES;
}

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceivePress:(UIPress *)press
{
return YES;
}

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

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return NO;
}

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

最后附上私有 API 中的两个代理方法, 有兴趣的可以看一看, 审核是否会被拒, 这个本人没有试验过, 不可得知:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer canBePreventedByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
BOOL result = YES;
// something you do
return result;
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer canPreventGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
BOOL result = YES;
// something you do
return result;
}