ios - 在 UIImagePickerController SourceType Camera 之后立即调整图像大小

Question

我正在尝试执行我认为是调整刚刚通过 UIImagePickerControllerSourceTypeCamera 拍摄的图像大小的简单任务。

拍完照片后，我想立即缩小它。我可以保持纵横比并将其缩小到大约 25%。这是我拉取刚刚拍摄的图像(称为 cameraImage)的地方。

任何帮助都会很棒!谢谢你们!

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

    cameraImage = [info objectForKey:UIImagePickerControllerOriginalImage];
    [[picker presentingViewController] dismissViewControllerAnimated:YES 
    completion:^{[self photoUpload];}];

}

Answer 1

UIImage *scaleDownImg = [ClassName imageWithImage: cameraImage scaledToSize:CGSizeMake(20, 20)];

+ (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
    //UIGraphicsBeginImageContext(newSize);
    // In next line, pass 0.0 to use the current device's pixel scaling factor (and thus account for Retina resolution).
    // Pass 1.0 to force exact pixel size.
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    
    UIGraphicsEndImageContext();
    return newImage;
}