Objective-C 通过绘图裁剪图像答案

【问题标题】：Objective-C Cropping Image by DrawingObjective-C 通过绘图裁剪图像
【发布时间】：2015-12-06 14:56:15
【问题描述】：

我是 iOS 新手。我想通过从用户那里绘制来裁剪图像。我在谷歌上搜索了一天，我没有得到结果。谢谢您的回答。

【问题讨论】：

猜猜花了几秒钟 Link-1 Link-2

【解决方案1】：

- (UIImage *)crop:(CGRect)rect {

    rect = CGRectMake(rect.origin.x*self.scale, 
                      rect.origin.y*self.scale, 
                      rect.size.width*self.scale, 
                      rect.size.height*self.scale);       

    CGImageRef imageRef = CGImageCreateWithImageInRect([self CGImage], rect);
    UIImage *result = [UIImage imageWithCGImage:imageRef 
                                          scale:self.scale 
                                    orientation:self.imageOrientation]; 
    CGImageRelease(imageRef);
    return result;
}

【讨论】：

【解决方案2】：

试试这个代码

  UIImagePickerController *picker=[[UIImagePickerController alloc] init];
    picker.delegate = self;
    [picker setAllowsEditing:YES];
    picker.sourceType=UIImagePickerControllerSourceTypeCamera;
    [self presentViewController:picker animated:YES completion:nil];

然后你可以从

获得裁剪图像

  - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
 {
  UIImage *image = [info valueForKey:UIImagePickerControllerEditedImage];
 picker dismissViewControllerAnimated:YES completion:^{}];

}

【讨论】：