iOS仿简书、淘宝等App的View弹出效果

用简书App的时候觉得这个View的弹出效果特别好，而且非常平滑，所以我就尝试写了一个，和简书App上的效果基本一致了:

下面开始讲解:

1.首先我们要知道这个页面有几个View？这个页面其实有四个View，self.view , 图中白色VC的View rootVC.view ,白色VC上的maskView maskView , 以及弹出的popView popView 。我们创建它们：

 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];
 
 //加个阴影
 popView.layer.shadowColor = [UIColor blackColor].CGColor;
 popView.layer.shadowOffset = CGSizeMake(0.5, 0.5);
 popView.layer.shadowOpacity = 0.8;
 popView.layer.shadowRadius = 5;
 
 //关闭btn
 UIButton * closeBtn = [UIButton buttonWithType:UIButtonTypeCustom];
 closeBtn.frame = CGRectMake(15, 0, 50, 40);
 [closeBtn setTitle:@"关闭" 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.然后要添加点击事件，这里为了方便我的弹出事件直接用的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]];
  //显示maskView
  [_maskView setAlpha:0.5f];
  //popView上升
  _popView.frame = frame;
 
 } completion:^(BOOL finished) {
 
 }];
 
 }];
 
}

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

然后关键的layer形变方法来了

- (CATransform3D)firstTransform{
 CATransform3D t1 = CATransform3DIdentity;
 t1.m34 = 1.0/-900;
 //带点缩小的效果
 t1 = CATransform3DScale(t1, 0.95, 0.95, 1);
 //绕x轴旋转
 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);
 //第二次缩小
 t2 = CATransform3DScale(t2, 0.8, 0.8, 1);
 return t2;
}

大家可以看到这，应该可以发现这里其实有两次形变

3.隐藏动画

- (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隐藏
 [_maskView setAlpha:0.f];
 //popView下降
 _popView.frame = frame;
 //同时进行 感觉更丝滑
 [_rootview.layer setTransform:[self firstTransform]];
 
 } completion:^(BOOL finished) {
 
 [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
  //变为初始值
  [_rootview.layer setTransform:CATransform3DIdentity];
 
 } completion:^(BOOL finished) {
 
  //移除
  [_popView removeFromSuperview];
 }];
 
 }];
 
 
}

最后，完整代码，已经封装好了，继承之后使用创建方法就行了

GitHub:Wzxhaha

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