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昨天用簡書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:

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下面開始講解:

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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：

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self.view.backgroundColor = [UIColor blackColor];

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?? _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)];

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????????popView.backgroundColor = [UIColor grayColor];

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????????//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;

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????????//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;

});????

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?? //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];

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????//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];

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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

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- (void)show

{

????[[UIApplication sharedApplication].windows[0] addSubview:_popView];

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????CGRect frame = _popView.frame;

????frame.origin.y = self.view.frame.size.height/2.0;

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????[UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{

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????????[_rootview.layer setTransform:[self firstTransform]];

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????} completion:^(BOOL finished) {

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????????[UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{

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????????????[_rootview.layer setTransform:[self secondTransform]];

????????????//顯示maskView

????????????[_maskView setAlpha:0.5f];

????????????//popView上升

????????????_popView.frame = frame;

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????????} completion:^(BOOL finished) {

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????????}];

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????}];

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}

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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];

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然后關鍵的layer形變方法來了

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- (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;

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}

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- (CATransform3D)secondTransform{

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????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;

}

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大家可以看到這，應該可以發現這里其實有兩次形變

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3.隱藏動畫

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- (void)close

{

????_isShow = NO;

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????CGRect frame = _popView.frame;

????frame.origin.y += self.view.frame.size.height/2.0;

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????[UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{

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????????//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]];

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????} completion:^(BOOL finished) {

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????????[UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{

????????????//變為初始值

????????????[_rootview.layer setTransform:CATransform3DIdentity];

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????????} completion:^(BOOL finished) {

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????????????//移除

???????????? [_popView removeFromSuperview];

????????}];

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????}];

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}

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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

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GitHub:Wzxhaha

https://github.com/Wzxhaha/WZXJianShuPopDemo

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總結

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