源码在底下
该框架代码非常简单,仅需几行代码即可用于项目。 1、目前支持动态图(GIF)、静态图,未来还会支持视频、缓存、横向等。 2、页面切换时带渐变效果,体验感更强 3、支持最后一页右移消失和前面页面直接跳过 4、支持额外自定义,显示页面底下dots以及skip按钮与否。 5、更低的内存占用、CPU占用 6、支持直接使用图片名字,框架自动识别图片类型 7、支持cocopods安装以及手动拖进项目
- (UIViewController *)setupDynamicVC { DWIntrosPageContentViewController *page1 = [DWIntrosPageContentViewController introsPageWithBackgroundImageWithName:@"gif01"]; DWIntrosPageContentViewController *page2 = [DWIntrosPageContentViewController introsPageWithBackgroundImageWithName:@"gif02"]; DWIntrosPageContentViewController *page3 = [DWIntrosPageContentViewController introsPageWithBackgroundImageWithName:@"gif03"]; DWIntrosPagesViewController *introsPage = [DWIntrosPagesViewController dwIntrosPagesWithPageArray:@[page1, page2, page3]]; __weak typeof(self) weakSelf = self; introsPage.skipButtonClickedBlock = ^{ NSLog(@"clicked skip button"); [weakSelf setupHomeVC]; }; return introsPage; }
上面为使用静态图方式,动态图方式与此大同小异,故不多说。
该框架主要有两大类:
DWIntrosPageContentViewController
引导页的每一个详情页面DWIntrosPagesViewController
相当于引导页的容器,承载引导页的每一个详情页面。下面摘取部分代码
DWIntrosPageContentViewController
+ (instancetype)introsPageWithBackgroundImageWithName:(NSString *)imgName { if ([imgName.pathExtension isEqualToString:@"jpg"] || [imgName.pathExtension isEqualToString:@"png"]) { return [[self alloc] initWithBackgroundImageWithName:imgName]; } NSData *data = [self gainFullImageWithName:imgName]; if ([_imagePathExtension((__bridge CFDataRef)(data)) isEqualToString:@"GIF"]) { return [[self alloc] initWithBackgroundGIFWithData:data]; }else if([_imagePathExtension((__bridge CFDataRef)(data)) isEqualToString:@"JPG"]) { return [[self alloc] initWithBackgroundNormalImageWithData:data]; } return [[self alloc] initWithBackgroundImageWithName:imgName]; }
设置每一页的详情,不同类型不同设置方式
+ (NSData *)gainFullImageWithName:(NSString *)name { if (name.length == 0) return nil; NSString *res = name.stringByDeletingPathExtension; NSString *ext = name.pathExtension; NSString *path = nil; NSArray *exts = ext.length > 0 ? @[ext] : @[@"", @"png", @"jpeg", @"jpg", @"gif", @"webp", @"apng"]; for (NSString *e in exts) { path = [[NSBundle mainBundle] pathForResource:res ofType:e]; if (path) break; } NSData *data = [NSData dataWithContentsOfFile:path]; if (data.length == 0) return nil; return data; }
判断图片是否有后缀,有后缀直接使用,没有后缀则尝试加上后缀名去
[NSBundle mainBundle]
寻找
DWIntrosPagesViewController
#pragma mark ------ UIPageViewControllerDelegate && DataSource ------ - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController { if (viewController == [self.viewControllers firstObject]) { return nil; // Return 'nil' to indicate that no more progress can be made in the given direction. (表示已经不能继续往左) }else { NSInteger lastPageIndex = [self.viewControllers indexOfObject:viewController] - 1; NSLog(@"%ld", (long)lastPageIndex); return [self.viewControllers objectAtIndex:lastPageIndex]; } } - (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController { if (viewController == [self.viewControllers lastObject]) { return nil; // (表示已经不能继续往右) }else { NSInteger nextPageIndex = [self.viewControllers indexOfObject:viewController] + 1; // NSLog(@"%ld", (long)nextPageIndex); return self.viewControllers[nextPageIndex]; } }
判断控制器数组中的控制器,如果是首页或者尾页,则返回nil
- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray<UIViewController *> *)previousViewControllers transitionCompleted:(BOOL)completed { // We need to confirm the transition completed and to do other things. // 确保转换完成才改变底下的小圆点 if (completed) { _currentPage = [pageViewController.viewControllers lastObject]; NSInteger currentIndex = [self.viewControllers indexOfObject:_currentPage]; [self.pageControl setCurrentPage:currentIndex]; } }
等页面切换完成后才切换底下的dots
#pragma mark ------ changeAlpha ------ - (void)changeAlphaWithRatio:(CGFloat)ratio scrollView:(UIScrollView *)scrollView { if (ratio == 0) { return; } // figure out alpha // next page alpha equals to the ratio CGFloat nextPageAlpha = ratio; CGFloat currentPageAlpha = 1 - ratio; // warning: don't mix up the order of the two sentences //注意: 不要弄乱下面两句顺序 [self.nextPage updateAlpha:nextPageAlpha]; [self.currentPage updateAlpha:currentPageAlpha]; // change the alpha of skip button and pageControl dots if (_nextPage == [self.viewControllers lastObject] ) { self.skipButton.alpha = currentPageAlpha; self.pageControl.alpha = currentPageAlpha; } if (_currentPage == [self.viewControllers lastObject]) { self.skipButton.alpha = nextPageAlpha; self.pageControl.alpha = nextPageAlpha; // The last page will not show the skill button and page dots. // 最后一页往右也不能出现下面两个按钮 if ((scrollView.contentOffset.x > self.historyX)) { self.skipButton.alpha = 0; self.pageControl.alpha = 0; if (scrollView.contentOffset.x - self.historyX > 45) { [self skipButtonCliked]; } } } }
根据移动的偏移值,对切换中的前后两个页面进行透明度的改变,从而达到渐变效果。
整体而言,代码非常简单,请各位大佬轻拍。
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