iOS 7 - UIImagePickerController中的黑色預覽屏幕

Question

使用以下代碼啓動圖像選擇器來捕獲圖像。
任何一個可以幫幫忙，關閉這個問題...

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) 
    {   

    if (self.camera) 
    { 
     self.camera = nil; 
    } 

    self.camera = [[UIImagePickerController alloc] init]; 
    self.camera.sourceType = UIImagePickerControllerSourceTypeCamera; 
    self.camera.allowsEditing = NO; 
    self.camera.delegate = self; 

    [self presentViewController:self.camera animated:YES completion:NULL]; 


} 

Answer 1

推出的UIImagePickerController如果您有任何背景GCD可能是針對此問題的原因之前。在我的代碼中有啓動UIImagePickerController之前GCD，現在刪除了GCD它工作正常。