在項(xiàng)目開發(fā)中断箫，很多都需要自定義引導(dǎo)頁，讓app更有特性秋冰。今天來說說自定義動(dòng)畫仲义，先上圖。

LeadPageControl.gif

主要用了2種動(dòng)畫方式剑勾，位移和縮放埃撵。

1、scrollView的contentSize給pageCount*screenWidth的寬度

2甥材、pagingEnabled賦值為YES盯另，按頁滑動(dòng)

3、每一個(gè)LeadPageView中定義相應(yīng)的控件布局

4洲赵、定義屬性beginContentOffsetX鸳惯，記錄每一頁開始的contentOffsetX

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
    self.beginContentOffsetX = scrollView.contentOffset.x;
}

5、根據(jù)scrollView的contentOffsetX與每一頁的beginContentOffsetX值變化叠萍，計(jì)算當(dāng)前滑動(dòng)的位置芝发，進(jìn)行PageView內(nèi)控件的位移變化或縮放

• 注意：正向滑動(dòng)與反向滑動(dòng)都要考慮到位移變化

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    NSInteger a=scrollView.contentOffset.x;
    NSInteger c=LBScreenW;
    CGFloat b=a%c;
    CGFloat rate = (b/LBScreenW);
    if  (rate != 0 && scrollView.contentOffset.x > 0) {
        if (scrollView.contentOffset.x - self.beginContentOffsetX > 0) {
            /* 從左到右滑動(dòng) */
            if (self.scrollView.contentOffset.x > LBScreenW ){
                // 從第二到第三張
                 [self scrollPageTwoAnimate:rate];
            } else if (scrollView.contentOffset.x > 0) {
                // 從第一到第二張
                 [self scrollPageOneAnimate:rate];
            }
        } else {
            /* 從右到左滑動(dòng) */
            if (scrollView.contentOffset.x < LBScreenW) {
                // 從第二到第一張
                 [self scrollPageOneAnimate:rate];
            } else if (scrollView.contentOffset.x < LBScreenW * 2) {
                // 從第三到第二張
                 [self scrollPageTwoAnimate:rate];
            }
        }
    }
}

6、開啟按鈕苛谷，block事件回調(diào)

- (instancetype)initWithClickInsertApp:(void(^)(void))block {
    if (self == [super init]) {
        self.callback = block;
    }
    return self;
}

- (void)inserAppAction {
    if (self.callback) {
        self.callback();
    }
}

7辅鲸、 Appdelegaet的didFinishLaunchingWithOptions中調(diào)用

    __weak __typeof(self) weakSelf = self;
    LBLeadPageController* vc = [[LBLeadPageController alloc] initWithClickInsertApp:^{
        dispatch_async(dispatch_get_main_queue(), ^{  // 主線程更新
            [weakSelf restoreRootViewController:[ViewController new]];
        });
    }];
    self.window.rootViewController = vc;

8、更換rootViewController動(dòng)畫

// 更換rootViewController動(dòng)畫
- (void)restoreRootViewController:(UIViewController *)rootViewController {
    typedef void (^Animation)(void);
    UIWindow* window = [UIApplication sharedApplication].keyWindow;
    rootViewController.modalTransitionStyle = UIModalTransitionStylePartialCurl;
    Animation animation = ^{
        BOOL oldState = [UIView areAnimationsEnabled];
        [UIView setAnimationsEnabled:NO];
        UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:rootViewController];
        [UIApplication sharedApplication].keyWindow.rootViewController = nav;
        [UIView setAnimationsEnabled:oldState];
    };
    [UIView transitionWithView:window
                      duration:1.0f
                       options:UIViewAnimationOptionTransitionCurlUp
                    animations:animation
                    completion:nil];
}

Demo傳送門