嘗試過的UITableViewController

Question

模糊的UITableView後面UIAlertController

我想我的模糊UITableView（內UITableViewController），當我提出一個UIAlertController（UIAlertControllerStyleActionSheet），但使用UIBlurEffect和UIVisualEffectView不模糊表視圖的背後內容時;它只是阻止它。在模擬器和設備上都會發生。

- (void)showAlert { 
    UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]; 

    UIVisualEffectView *visualEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect]; 
    visualEffectView.frame = CGRectMake(0, self.tableView.contentOffset.y, self.view.frame.size.width, self.view.frame.size.height); 

    [self.view addSubview:visualEffectView]; 

    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Alert Title" message:@"Alert Message" preferredStyle:UIAlertControllerStyleActionSheet]; 

    [alert addAction:[UIAlertAction actionWithTitle:@"Action 1" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { 
     // handle choice... 

     [visualEffectView removeFromSuperview]; 
    }]]; 

    [alert addAction:[UIAlertAction actionWithTitle:@"Action 2" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { 
     // handle choice... 

     [visualEffectView removeFromSuperview]; 
    }]]; 

    [self presentViewController:alert animated:YES completion:nil]; 
} 

截圖：

有一個在動作片材應該後面表視圖文本內容被顯示爲模糊，例如這樣的形象：

Answer 1

我試圖對視圖，它工作正常。我在你的代碼中做了一些改變。

- (void)showAlert { 
    UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark]; 

    UIVisualEffectView *visualEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect]; 
    visualEffectView.frame = CGRectMake(0, self.view.frame.size.height/2, self.view.frame.size.width, self.view.frame.size.height); 

    //self.vBlur.backgroundColor = [UIColor clearColor]; 
    [self.view addSubview:visualEffectView]; 

    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Alert Title" message:@"Alert Message" preferredStyle:UIAlertControllerStyleActionSheet]; 

    [alert addAction:[UIAlertAction actionWithTitle:@"Action 1" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { 
     // handle choice... 

     [visualEffectView removeFromSuperview]; 
    }]]; 

    [alert addAction:[UIAlertAction actionWithTitle:@"Action 2" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { 
     // handle choice... 

     [visualEffectView removeFromSuperview]; 
    }]]; 

    [self presentViewController:alert animated:YES completion:nil]; 
}