类似于系统UIActionSheet弹出时Sheet上升加蒙版点击还原

项目中又做到下图的个人页界面，又要重新开始解决各个控件重叠触发的问题，决定加蒙版，然后又发现导航栏没被遮住，就决定加载Window上，没什么难得东西，只是为了以后直接拿来用罢了

WechatIMG20.jpeg

直接上代码，加上注释应该很清楚了

@property (nonatomic,strong) AppDelegate *appdelegate;
@property (nonatomic,strong) UIView      *backgroundView; // 蒙版

// 懒加载
- (UIView *)backgroundView {
    
    if (!_backgroundView) {
        
        _backgroundView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
        _backgroundView.backgroundColor = [UIColor clearColor];
    }
    return _backgroundView;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    _appdelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
    
}

- (void)buttonClick:(UIButton*)button {
   // 添加手势到window 点击还原
  UITapGestureRecognizer *tapLeftDouble  = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(magnifyImage:)];
    [_appdelegate.window addGestureRecognizer:tapLeftDouble];

 [_appdelegate.window addSubview:self.backgroundView]; // 放置蒙版
 // 改变蒙版颜色及透明度
 [UIView animateWithDuration:.15f animations:^{
        self.backgroundView.backgroundColor = RGB(0, 0, 0);
        self.backgroundView.alpha = .4f;
    }];

// 动画改变目标view上升速度
 CATransition *animation = [CATransition animation];
    [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]];
    [animation setDuration:.15f];
    [animation setType:kCATransitionMoveIn];
    [animation setSubtype: kCATransitionFromTop];
    
// _dateView 是我使用的view  此处替换成自己的
    _dateView       = [SHDatePickerView viewFromXIB];
    _dateView.frame = CGRectMake(0, viewHeight - 261, viewWidth, 261);
    [_appdelegate.window addSubview:_dateView];
    
    [_dateView.layer addAnimation:animation forKey:@"Reveal"];

}

// 手势还原
-(void)magnifyImage:(UIGestureRecognizer *)gesture
{
        [_dateView removeFromSuperview];
        [self.backgroundView removeFromSuperview];
}