Question

我想在拍照后在UIImagepickercontroller中获取URL图像。我在didFinishPickingMedia中使用了以下代码..

 NSData *webData = UIImagePNGRepresentation(image);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *localFilePath = [documentsDirectory stringByAppendingPathComponent:png];
[webData writeToFile:localFilePath atomically:YES];
NSLog(@"localFilePath.%@",localFilePath);

UIImage *image1 = [UIImage imageWithContentsOfFile:localFilePath];

但在控制台打印（null）

你能告诉我吗？感谢

Answer 1

图像选择器有两个成功委托方法如下：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo;
// This is Deprecated in ios 3.0

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

在我看来，你正在使用第一种方法（你没有提到方法，但我想让你知道）。在这种情况下，您必须将实现更改为第二种方法。

要访问UIImage并将其存储到某个路径，请按以下步骤使用：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    //Zoomed or scrolled image if picker.editing = YES;
    UIImage *editedImage = [info objectForKey:UIImagePickerControllerEditedImage]; 
    // Original Image
    UIImage *OriginalImage = [info objectForKey:UIImagePickerControllerOriginalImage]; 

    // You can directly use this image but in case you want to store it some where
    NSString *docDirPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *filePath =  [docDirPath stringByAppendingPathComponent:@"myImage.png"];
    NSLog (@"File Path = %@", filePath);

    // Get PNG data from following method
    NSData *myData =     UIImagePNGRepresentation(editedImage);
    // It is better to get JPEG data because jpeg data will store the location and other related information of image.
    [myData writeToFile:filePath atomically:YES];

    // Now you can use filePath as path of your image. For retrieving the image back from the path
    UIImage *imageFromFile = [UIImage imageWithContentsOfFile:filePath];
}

希望这可以帮助你：）

如何在UIImagepickercontroller中获取URL图像

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