從選定區域的uiimagepickerviewcontroller中裁剪圖像

Question

如何在拍攝圖像時在選定區域從UIImagePickerController裁剪圖像。 OverlayView的到UIImagePickerController

Answer 1

下面的代碼

-(UIImage *)centerCropImage:(UIImage *)image 
{ 
    // Use smallest side length as crop square length 
    CGFloat squareLength = MIN(image.size.width, image.size.height); 
    // Center the crop area 
    CGRect clippedRect = CGRectMake((image.size.width - squareLength)/2, (image.size.height - squareLength)/2, squareLength, squareLength); 
    // Crop logic 
    CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], clippedRect); 
    UIImage * croppedImage = [UIImage imageWithCGImage:imageRef]; 
    CGImageRelease(imageRef); 
    return croppedImage; 
} 

後，在imagePickerViewDelegate方法

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{ 
    UIImage *image = [info objectForKey: @"UIImagePickerControllerOriginalImage"]; 
    [self centerCropImage:image]; //Just give your image here for cropping 
    yourImage.image=image; 
    picker.delegate =self; 
    [picker dismissViewControllerAnimated:YES completion:nil]; 
}