仿简书、淘宝等等App的View弹出效果

 

http://ios.jobbole.com/84732/ 源链接

 

 

pop.png

昨天用简书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:

JianShuPop.gif

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：

 

 

 

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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

 

 

 

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- (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

 

 

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- (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

 

 

 

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- (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