iOS仿簡書、淘寶等App的View彈出效果_IOS

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 。我們建立它們：

 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.然後要添加點擊事件，這裡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) {   }];  }]; }

這裡要注意一下的就是popview是添加到window上面的:[[UIApplication sharedApplication].windows[0] addSubview:_popView];

然後關鍵的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，應該可以發現這裡其實有兩次形變

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];  }];  }];  }

最後，完整代碼，已經封裝好了，繼承之後使用建立方法就行了

GitHub:Wzxhaha

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