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];}];
}
答案 0 :(得分:2)
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;
}