使用UIImagePickerController拍照后如何调整图像大小？ [英] How to adjust a image size after using UIImagePickerController take a photo?

问题描述

如何在文档文件夹中保存照片时调整图像大小???

How to resize a image when save photo in document folder ???

这是我在iphone中保存图像的方式。

This is how I save an image in iphone.

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *imageFile = nil;
NSString *name_png = [NSString stringWithFormat:@"%@.png",photoName];
imageFile = [documentsDirectory stringByAppendingPathComponent:name_png];
[UIImagePNGRepresentation(self.theImageView.image) writeToFile:imageFile atomically:YES];

如何将其从原始大小调整为200 X 200像素？

How to resize it from original size to 200 X 200 pixels?

或者我可以加载图像文件而不是调整大小吗？

Or can I load the image file than resize it?

实际上，我创建了一个包含许多图像的封面流程，图像来自相机。

Actually, I was create a cover flow with many images, and the image was from camera.

我可以找到一个封面流样本，但是当我加载图片时，它充满了iphone屏幕。

I can find a cover flow sample, but when I load image, it full of iphone screen.

不小的封面图片。

推荐答案

UIImage调整大小：通过这个链接。

UIImage resize : Go thru this link.

感谢Paul Lynch。

Thanks to Paul Lynch.

+ (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    
    UIGraphicsEndImageContext();
    return newImage;
}

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