用簡書App的時候覺得這個View的彈出效果特別好，而且非常平滑，所以我就嘗試寫了一個，和簡書App上的效果基本一致了:
下面開始講解:
1.首先我們要知道這個頁面有幾個View？這個頁面其實有四個View，self.view , 圖中白色VC的View rootVC.view ,白色VC上的maskView maskView , 以及彈出的popView popView 。我們創建它們：
self.view.backgroundColor = [UIColor blackColor]; _popView = ({ UIView * popView = [[UIView alloc]initWithFrame:CGRectMake(0, [UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height /2.0)]; popView.backgroundColor = [UIColor grayColor]; //加個陰影 popView.layer.shadowColor = [UIColor blackColor].CGColor; popView.layer.shadowOffset = CGSizeMake(0.5, 0.5); popView.layer.shadowOpacity = 0.8; popView.layer.shadowRadius = 5; //關閉btn UIButton * closeBtn = [UIButton buttonWithType:UIButtonTypeCustom]; closeBtn.frame = CGRectMake(15, 0, 50, 40); [closeBtn setTitle:@"關閉" forState:UIControlStateNormal]; [closeBtn setTitleColor:[UIColor colorWithRed:217/255.0 green:110/255.0 blue:90/255.0 alpha:1] forState:UIControlStateNormal]; [closeBtn addTarget:self action:@selector(close) forControlEvents:UIControlEventTouchUpInside]; [popView addSubview:closeBtn]; popView;}); //添加VC的View的方法 _rootVC.view.frame = self.view.bounds; _rootVC.view.backgroundColor = [UIColor whiteColor]; _rootview = _rootVC.view; [self addChildViewController:_rootVC]; [self.view addSubview:_rootview]; //rootVC上的maskView _maskView = ({ UIView * maskView = [[UIView alloc]initWithFrame:self.view.bounds]; maskView.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5]; maskView.alpha = 0; maskView; }); [_rootview addSubview:_maskView];2.然后要添加點擊事件，這里為了方便我的彈出事件直接用的touchesBegan
- (void)show{ [[UIApplication sharedApplication].windows[0] addSubview:_popView]; CGRect frame = _popView.frame; frame.origin.y = self.view.frame.size.height/2.0; [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{ [_rootview.layer setTransform:[self firstTransform]]; } completion:^(BOOL finished) { [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{ [_rootview.layer setTransform:[self secondTransform]]; //顯示maskView [_maskView setAlpha:0.5f]; //popView上升 _popView.frame = frame; } completion:^(BOOL finished) { }]; }]; }這里要注意一下的就是popview是添加到window上面的:[[UIApplication sharedApplication].windows[0] addSubview:_popView];
然后關鍵的layer形變方法來了
- (CATransform3D)firstTransform{ CATransform3D t1 = CATransform3DIdentity; t1.m34 = 1.0/-900; //帶點縮小的效果 t1 = CATransform3DScale(t1, 0.95, 0.95, 1); //繞x軸旋轉 t1 = CATransform3DRotate(t1, 15.0 * M_PI/180.0, 1, 0, 0); return t1;}- (CATransform3D)secondTransform{ CATransform3D t2 = CATransform3DIdentity; t2.m34 = [self firstTransform].m34; //向上移 t2 = CATransform3DTranslate(t2, 0, self.view.frame.size.height * (-0.08), 0); //第二次縮小 t2 = CATransform3DScale(t2, 0.8, 0.8, 1); return t2;}大家可以看到這，應該可以發現這里其實有兩次形變
3.隱藏動畫
- (void)close{ _isShow = NO; CGRect frame = _popView.frame; frame.origin.y += self.view.frame.size.height/2.0; [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{ //maskView隱藏 [_maskView setAlpha:0.f]; //popView下降 _popView.frame = frame; //同時進行 感覺更絲滑 [_rootview.layer setTransform:[self firstTransform]]; } completion:^(BOOL finished) { [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{ //變為初始值 [_rootview.layer setTransform:CATransform3DIdentity]; } completion:^(BOOL finished) { //移除 [_popView removeFromSuperview]; }]; }]; }最后，完整代碼，已經封裝好了，繼承之后使用創建方法就行了
GitHub:Wzxhaha
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。
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