iOS仿简书、淘宝等App的View弹出效果

2020-01-15 19:00:09 来源:易采站长站 作者:于丽

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:

iOS,View,弹出

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];

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