扩大UIPageViewController的点击范围

UIPageViewController中的边缘点击手势大概是屏幕的1/6，市面的大多数阅读器点击手势都在1/3以上，或者我干脆想自定义点击的范围，但又不想放弃系统的翻页效果，这时候该怎么做了？其实很简单，听我细细说来。

1.首先禁用UIPageViewController的tap手势（如果不禁用，会造成多次翻页）

可以创建UIPageViewController的分类，重写shouldReceiveTouch:方法即可

@implementation UIPageViewController (EnlargeTapRegion)

-(BOOL) gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
    if ([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {
        return NO;
    }
    return YES;
}

@end

2.自定义tap手势，实现touchReceiveTouch中的有效点击及响应的点击方法

- (void)tapSelf:(UIGestureRecognizer *)gesture {
    NSLog(@"receive tap action !!!");
    UIView *touchView = gesture.view;
    CGPoint touchPoint = [gesture locationInView:touchView];
    CGFloat viewWidth = CGRectGetWidth(touchView.frame);
    if (touchPoint.x < viewWidth/3) {
        _page -= 2;
        UIViewController *preVC = [self previousVC];
        BackPageViewController *backVC = [self backVCAt:[self previousVC]];
        [self.pageVC setViewControllers:@[preVC,backVC] direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:nil];
    }else if (touchPoint.x > viewWidth/3*2) {
        _page += 2;
        UIViewController *nextVC = [self nextVC];
        BackPageViewController *backVC = [self backVCAt:[self nextVC]];
        [self.pageVC setViewControllers:@[nextVC,backVC] direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];
    }
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    UIView *touchView = gestureRecognizer.view;
    CGPoint touchPoint = [gestureRecognizer locationInView:touchView];
    CGFloat viewWidth = CGRectGetWidth(touchView.frame);
    if (gestureRecognizer == _weakTap) {
        if (touchPoint.x < viewWidth/3 || touchPoint.x > viewWidth/3*2) {
            return YES;
        }
    }
    return NO;
}

　　-shouldReceiveTouch方法中判断当前的触点X是否规定区域内，否则返回NO

　　 -tapSelf方法中根据触点位置判断翻页方向，使用pageViewController的方法setViewController:direction:方法实现手动跳转

　　　　注意：使用这种方式跳转，不会常规走pageViewController的代理方法，需要自行处理数据的同步

pageviewController的双面模式实现，仅仅在pageCurl翻页模式下存在

1.设置doubleSide属性为YES

2.viewControllerBeforeViewController:及viewControllerAfterViewController代理方法中根据页面返回相应的控制器

-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
    _page -= 1;
    if (_page % 2 == 1) {
        return [self backVCAt:[self previousVC]];
    }else {
        return [self previousVC];
    }
}
-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
    _page += 1;
    if (_page % 2 == 1) {
        return [self backVCAt:[self nextVC]];
    }else {
        return [self nextVC];
    }
}

3.当前视图的左右翻转透明显示

自定义控制器里面添加imageView，外界传入原本控制器或控制器视图，对该视图进行翻转绘制成图片赋给imageView

-(UIImage *)captureWithView:(UIView *)view
{
    CGRect rect = view.bounds;
    UIGraphicsBeginImageContextWithOptions(rect.size, YES, 0.0f);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGAffineTransform transform = CGAffineTransformMake(-1.0, 0.0, 0.0, 1.0, rect.size.width, 0.0);
    CGContextConcatCTM(context, transform);
    [view.layer renderInContext:context];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

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