前言:
該框架程式碼非常簡單,僅需幾行程式碼即可用於專案。 1、目前支援動態圖(GIF)、靜態圖,未來還會支援視訊、快取、橫向等。 2、頁面切換時帶漸變效果,體驗感更強 3、支援最後一頁右移消失和前面頁面直接跳過 4、支援額外自定義,顯示頁面底下dots以及skip按鈕與否。 5、更低的記憶體佔用、CPU佔用 6、支援直接使用圖片名字,框架自動識別圖片型別 7、支援cocopods安裝以及手動拖進專案
1、使用方式:
- (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;
}
複製程式碼
上面為使用靜態圖方式,動態圖方式與此大同小異,故不多說。
2、框架目錄
該框架主要有兩大類:
DWIntrosPageContentViewController
引導頁的每一個詳情頁面DWIntrosPagesViewController
相當於引導頁的容器,承載引導頁的每一個詳情頁面。
下面摘取部分程式碼
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];
}
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設定每一頁的詳情,不同型別不同設定方式
+ (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;
}
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判斷圖片是否有字尾,有字尾直接使用,沒有字尾則嘗試加上字尾名去
[NSBundle mainBundle]
尋找
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. (表示已經不能繼續往左)
}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; // (表示已經不能繼續往右)
}else {
NSInteger nextPageIndex = [self.viewControllers indexOfObject:viewController] + 1;
// NSLog(@"%ld", (long)nextPageIndex);
return self.viewControllers[nextPageIndex];
}
}
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判斷控制器陣列中的控制器,如果是首頁或者尾頁,則返回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.
// 確保轉換完成才改變底下的小圓點
if (completed) {
_currentPage = [pageViewController.viewControllers lastObject];
NSInteger currentIndex = [self.viewControllers indexOfObject:_currentPage];
[self.pageControl setCurrentPage:currentIndex];
}
}
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等頁面切換完成後才切換底下的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: 不要弄亂下面兩句順序
[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.
// 最後一頁往右也不能出現下面兩個按鈕
if ((scrollView.contentOffset.x > self.historyX)) {
self.skipButton.alpha = 0;
self.pageControl.alpha = 0;
if (scrollView.contentOffset.x - self.historyX > 45) {
[self skipButtonCliked];
}
}
}
}
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根據移動的偏移值,對切換中的前後兩個頁面進行透明度的改變,從而達到漸變效果。
最後
整體而言,程式碼非常簡單,請各位大佬輕拍。