相册、图库、拍照功能的访问以及图像角度设置

在我们需要访问UIImagePickerController的时候，一般为选择图片，此时我们可能需要做如下操作：

一、访问相册、图库、拍照功能；

二、图片设置；

1、需要将选择的图片缩小（等比例）；

2、设置图片的形状（比如：希望选择的图片为圆形）；

3、将图片翻转一定的角度（比如翻转90度、180度等）

以下是我自己的总结的一些方法：

一、访问功能

- (IBAction)changeIconAction:(UITapGestureRecognizer *)sender {
//    UIActionSheet *actionSheet = [[UIActionSheet alloc]initWithTitle:@"选择头像" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"拍照",@"相册",@"图库", nil];
//    [actionSheet showInView:[UIApplication sharedApplication].keyWindow];
    
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
    [alertController addAction:[UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [self makePhoto];
        });
    }]];
    [alertController addAction:[UIAlertAction actionWithTitle:@"相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [self choosePicture];
        });
    }]];
    [alertController addAction:[UIAlertAction actionWithTitle:@"图库" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [self pictureLibrary];
        });
    }]];
    
    [alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
    }]];
    
    [self presentViewController:alertController animated:YES completion:nil];
}

//跳转到imagePicker里
- (void)makePhoto{
    pickerController = [[UIImagePickerController alloc] init];
    pickerController.allowsEditing = YES;
    pickerController.delegate = self;
    pickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
    [self presentViewController:pickerController animated:YES completion:nil];
}
//跳转到相册
- (void)choosePicture
{
    pickerController.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    [self presentViewController:pickerController animated:YES completion:nil];
}
//跳转图库
- (void)pictureLibrary
{
    pickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    [self presentViewController:pickerController animated:YES completion:nil];
}
//用户取消退出picker时候调用
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    NSLog(@"%@",picker);
    [pickerController dismissViewControllerAnimated:YES completion:^{
        
    }];
}
//用户选中图片之后的回调
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    
    NSLog(@"%s,info == %@",__func__,info);
    
    UIImage *userImage = [self fixOrientation:[info objectForKey:@"UIImagePickerControllerOriginalImage"]];
    
    userImage = [self scaleImage:userImage toScale:0.3];
    
    //保存图片
//    [self saveImage:userImage name:@"某个特定标示"];
    
    [pickerController dismissViewControllerAnimated:YES completion:^{
        
        
    }];
    [self.headIcon setImage:userImage];
    self.headIcon.contentMode = UIViewContentModeScaleAspectFill;
    self.headIcon.clipsToBounds = YES;
    //照片上传
    [self upDateHeadIcon:userImage];
}

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