具有透明背景的Objective-C模態視圖控制器

Question

我想創建一個具有透明背景的模式視圖控制器，但是當我嘗試將背景的alpha設置爲0.5時，它只是將背後的視圖變爲完全黑色。這是因爲在轉換後，背景視圖將被刪除。

self.view.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5]; 
[self setModalPresentationStyle:UIModalPresentationFullScreen]; 
[self setDefinesPresentationContext:YES]; 

然後呈現視圖控制器代碼

SecondViewController *alertView = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil]; 
[self presentViewController:alertView animated:YES completion:nil]; 

請看鏈接 image/linke.gif

Answer 1

嘗試在按鈕的動作該代碼在firstViewController更改視圖控制器並呈現新類別secondViewController

secondViewController *VC = [self.storyboard instantiateViewControllerWithIdentifier:@"secondViewController"]; 

    VC.view.backgroundColor=[UIColor colorWithWhite:0 alpha:0.1f]; 
    VC.modalPresentationStyle=UIModalPresentationOverCurrentContext; 
    [self presentViewController:VC animated:NO completion:nil];