ios 7.1 flash 模式不工作

Posted 2023-02-23

【中文标题】ios 7.1 flash 模式不工作

【英文标题】：ios 7.1 flash mode don't work

【发布时间】：2014-04-18 14:27:55

【问题描述】：

这是我在 iphone 上更改闪光灯模式的代码。

在ios7.0工作：flashmode(0,1,-1)

在 ios7.1 中不起作用：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;

【问题讨论】：

***.com/questions/22457097/… 对我不起作用

【参考方案1】：

我之前遇到过这个错误

问题是，无论在ios 7.1 中真正的flash state 是什么，它总是返回UIImagePickerControllerCameraFlashModeAuto。有趣的是，如果你将闪光灯模式设置为UIImagePickerControllerCameraFlashModeOff，闪光灯确实会关闭，但如果你问状态，它仍然是UIImagePickerControllerCameraFlashModeAuto。

所以我通过保留自己的“flashState”解决了我的问题。单击时，我手动更改了自己的状态，并且从不相信发回的状态，而是 UIImagePickerController。

@property (nonatomic) UIImagePickerControllerCameraFlashMode flashMode;

当按钮被点击时：

       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;