的UIImage返回nil（xcode5）

-3

我的UIImage是零，如果我嘗試測試的代碼塊：的UIImage返回nil（xcode5）

- (IBAction)sliderBrightness:(id)sender { 

    UIImage *inputImage = imgView.image; 

    GPUImageBrightnessFilter *stillImageFilter = [[GPUImageBrightnessFilter alloc] init]; 
    GPUImagePicture *stillImageSource = [[GPUImagePicture alloc] initWithImage:inputImage]; 

    [stillImageSource addTarget:stillImageFilter]; 
    [stillImageFilter useNextFrameForImageCapture]; 
    [stillImageSource processImage]; 

    UIImage *currentFilteredVideoFrame = [stillImageFilter imageFromCurrentFramebuffer]; 
    [self->imgView setImage:currentFilteredVideoFrame]; 
}

UPDATE：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{ 

imgView.image = [info objectForKey:@"UIImagePickerControllerEditedImage"]; 

if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) { 

    toolbar.hidden = NO; 

    UIImage *image1 = imgView.image; 
    NSString *cachedFolderPath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0]; 
    NSString *cachedImagePath = [cachedFolderPath stringByAppendingPathComponent:@"image1.png"]; 
    [UIImagePNGRepresentation(image1) writeToFile:cachedImagePath atomically:YES]; 

} 

if (picker.sourceType == UIImagePickerControllerSourceTypePhotoLibrary) { 

    toolbar.hidden = NO; 

    UIImage *image1 = imgView.image; 
    NSString *cachedFolderPath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0]; 
    NSString *cachedImagePath = [cachedFolderPath stringByAppendingPathComponent:@"image1.png"]; 
    [UIImagePNGRepresentation(image1) writeToFile:cachedImagePath atomically:YES]; 
} 

if (picker.sourceType == UIImagePickerControllerSourceTypeSavedPhotosAlbum) { 

    toolbar.hidden = NO; 

    UIImage *image1 = imgView.image; 
    NSString *cachedFolderPath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0]; 
    NSString *cachedImagePath = [cachedFolderPath stringByAppendingPathComponent:@"image1.png"]; 
    [UIImagePNGRepresentation(image1) writeToFile:cachedImagePath atomically:YES]; 
} 

else{ 

    toolbar.hidden = NO; 

} 

[self dismissViewControllerAnimated:YES completion:nil];

}

調試器（inputImage的是無）：

enter image description here

我希望有人能幫助我。在此先感謝您的幫助。

我使用的Xcode 5.1.1（iPhone模擬器：iPhone 4英寸; 64位; iOS7.1）

來源

2014-04-30 user3576580

你是怎麼設置'imgView.image'的？ – Logan

我在這個IBAction後的方法中設置了imgView.image（imgView.image = [info objectForKey：@「UIImagePickerControllerEditedImage」];） – user3576580

*哪個*圖像爲零？ 'inputImage'或'currentFilteredVideoFrame'？ – Caleb

如果（如你在評論中說的）問題是inputImage爲零，問題在您發佈的代碼的外部。 imgView本身爲零，或者它指向尚未設置其圖像集的UIImageView實例。把上線斷點：

UIImage *inputImage = imgView.image;

和檢查imgView，以確定哪些這些可能性的問題。

來源

2014-04-30 21:04:27 Caleb

imgView不是零，imgView中的圖像被設置（從圖庫中選擇）。我在我的問題中發佈了一張圖片。也許它有助於解決這個問題？ – user3576580

調試器在執行當前行之前停止。您需要跳過調試程序停止的行，以便分配給inputImage。 – Caleb

好吧，現在inputImage不是零，但它仍然崩潰。而你應該知道的是，IBAction是一個應該改變亮度的UISlider。 – user3576580

的UIImage返回nil（xcode5）

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