QLPreviewController 隐藏底部按钮

需求是在线预览PDF、DOC等文档,经过反复测试。发现无论是UIDocumentInteractionController 和QLPreviewController 均无法实现在线直接预览文件(如果谁做到了望通知),因此折中先实现文件下载,再用QLPreviewController打开,但是打开过程中发现底部有一条ToolBar,上面存在了一个shareItem,因此想要隐藏它。

为了隐藏这个toolBar找到stackover上文章QLPreviewController hide bottom toolbar

  • 新建 QLPreviewController

  • 通过方法获取所有toolBar,测试是2个

-(NSArray *)findAllToolBarsFromView:(UIView *)view{
    NSMutableArray * bars = [[NSMutableArray alloc]initWithCapacity:0]; 
    for (UIView * view2 in view.subviews) {
        if ([view2 isKindOfClass:[UIToolbar class]]) {
            [bars addObject:view2];
        }
        [bars addObjectsFromArray:[self findAllToolBarsFromView:view2]];
    }
    return  bars;
}```


* 获取到toolBars之后,隐藏toolbar,并监听‘hidden’

```-(void)viewWillAppear:(BOOL)animated{ 
    [super viewWillAppear:animated];
      self.qlToolBar = [self getToolBarFromView:self.view];
      self.qlToolBar.hidden = true;
      if (self.qlToolBar) {
          [self.qlToolBar addObserver:self forKeyPath:@"hidden" options:NSKeyValueObservingOptionPrior context:nil];
      } }```
    - (void)viewWillDisappear:(BOOL)animated{
      [super viewWillDisappear:animated];
      [self.navigationController removeObserver:self forKeyPath:@"hidden"];
    }
    - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{

      BOOL isToolBarHidden = self.qlToolBar.hidden;
      // If the ToolBar is not hidden
      if (!isToolBarHidden) {
          dispatch_async(dispatch_get_main_queue(), ^{
              self.qlToolBar.hidden = true;
          });
      }
    }```

最终隐藏了下面的toolBar

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