用簡書App的時刻認為這個View的彈出後果特殊好，並且異常膩滑，所以我就測驗考試寫了一個，和簡書App上的後果根本分歧了:

上面開端講授:

1.起首我們要曉得這個頁面有幾個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 , 和彈出的popView popView 。我們創立它們：

 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];
 
  //加個暗影
  popView.layer.shadowColor = [UIColor blackColor].CGColor;
  popView.layer.shadowOffset = CGSizeMake(0.5, 0.5);
  popView.layer.shadowOpacity = 0.8;
  popView.layer.shadowRadius = 5;
 
  //封閉btn
  UIButton * closeBtn = [UIButton buttonWithType:UIButtonTypeCustom];
  closeBtn.frame = CGRectMake(15, 0, 50, 40);
  [closeBtn setTitle:@"封閉" 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的辦法
 _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.然後要添加點擊事宜，這裡為了便利我的彈失事件直接用的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) {
 
  }];
 
 }];
 
}

這裡要留意一下的就是popview是添加到Window下面的:[[UIApplication sharedApplication].Windows[0] addSubview:_popView];

然後症結的layer形變辦法來了

- (CATransform3D)firstTransform{
 CATransform3D t1 = CATransform3DIdentity;
 t1.m34 = 1.0/-900;
 //帶點減少的後果
 t1 = CATransform3DScale(t1, 0.95, 0.95, 1);
 //繞x軸扭轉
 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);
 //第二次減少
 t2 = CATransform3DScale(t2, 0.8, 0.8, 1);
 return t2;
}

年夜家可以看到這，應當可以發明這裡其實有兩次形變

3.隱蔽動畫

- (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隱蔽
  [_maskView setAlpha:0.f];
  //popView降低
  _popView.frame = frame;
  //同時停止 感到更絲滑
  [_rootview.layer setTransform:[self firstTransform]];
 
 } completion:^(BOOL finished) {
 
  [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
   //變成初始值
   [_rootview.layer setTransform:CATransform3DIdentity];
 
  } completion:^(BOOL finished) {
 
   //移除
    [_popView removeFromSuperview];
  }];
 
 }];
 
 
}

最初，完全代碼，曾經封裝好了，繼續以後應用創立辦法就好了

GitHub:Wzxhaha

以上就是本文的全體內容，願望對年夜家的進修有所贊助，也願望年夜家多多支撐本站。

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