ios 7.1閃光模式不工作

Question

這是我的代碼來改變iphone上的閃光模式。

在ios7.0的工作原理：flashmode（0,1，-1）

在ios7.1不工作：flashmode（0,0,0）

//UIImagePickerControllerCameraFlashModeOff = -1, 
//UIImagePickerControllerCameraFlashModeAuto = 0, 
//UIImagePickerControllerCameraFlashModeOn = 1 

NSInteger flashMode = self.pickerReference.cameraFlashMode; 

NSLog(@"flashmode %i",flashMode); 

if (flashMode == UIImagePickerControllerCameraFlashModeAuto) { 
    [(UIButton *)sender setImage:[UIImage imageNamed:@"flashYesComposeButton.png"] forState:UIControlStateNormal]; 
    self.pickerReference.cameraFlashMode = UIImagePickerControllerCameraFlashModeOn; 
} 

else if (flashMode == UIImagePickerControllerCameraFlashModeOn) { 
    [(UIButton *)sender setImage:[UIImage imageNamed:@"flashNoComposeButton.png"] forState:UIControlStateNormal]; 
    self.pickerReference.cameraFlashMode = UIImagePickerControllerCameraFlashModeOff; 
} 

else if (flashMode == UIImagePickerControllerCameraFlashModeOff) 
{ 
    [(UIButton *)sender setImage:[UIImage imageNamed:@"flashAutoComposeButton.png"] forState:UIControlStateNormal]; 
    self.pickerReference.cameraFlashMode = UIImagePickerControllerCameraFlashModeAuto; 
} 

Answer 1

我跑進之前的錯誤

問題是，無論ios 7.1中的真實閃存狀態如何，它總是返回UIImagePickerControllerCameraFlashModeAuto。有趣的是，如果將閃光燈模式設置爲UIImagePickerControllerCameraFlashModeOff，閃光燈將確實熄滅，但如果您詢問該狀態，它仍將是UIImagePickerControllerCameraFlashModeAuto。

所以我通過保留我自己的「flashState」來解決我的問題。點擊時，我手動更改自己的狀態，並且永遠不會相信發回的但是UIImagePickerController。當按鈕被點擊

@property (nonatomic) UIImagePickerControllerCameraFlashMode flashMode; 

：

 if (self.flashMode == UIImagePickerControllerCameraFlashModeAuto) { 
      //toggle your button to "on" 
      self.flashMode = UIImagePickerControllerCameraFlashModeOn; 
     }else if (self.flashMode == UIImagePickerControllerCameraFlashModeOn){ 
      //toggle your button to "Off" 
      self.flashMode = UIImagePickerControllerCameraFlashModeOff; 
     }else if (self.flashMode == UIImagePickerControllerCameraFlashModeOff){ 
      //toggle your button to "Auto" 
      self.flashMode = UIImagePickerControllerCameraFlashModeAuto; 
     }