Question

我正在尝试执行我认为调整刚刚通过UIImagePickerControllerSourceTypeCamera拍摄的图像的简单任务。

拍摄照片后，我想立即缩小图片。我很好地保持纵横比并将其缩小到约25％。这是我拉取刚刚拍摄的图像（称为cameraImage）。

任何帮助都会很精彩！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;
}

在UIImagePickerControllerSourceTypeCamera之后立即调整图像大小

1 个答案: