點(diǎn)擊圖片調(diào)取相機(jī)或相冊(cè)

//遵循協(xié)議（調(diào)取相冊(cè)、相機(jī)使用）
<UIImagePickerControllerDelegate,UINavigationControllerDelegate>
//給頭像開啟用戶交互
 self.avatarImage.userInteractionEnabled = YES;
//設(shè)置手勢(shì)識(shí)別
    UITapGestureRecognizer * recognize = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(addDevies)];
    [self.avatarImage addGestureRecognizer:recognize];

//圖片點(diǎn)擊事件
- (void)addDevies
{
    //創(chuàng)建UIAlertController是為了讓用戶去選擇照片來(lái)源,拍照或者相冊(cè).
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:0];
    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
    imagePickerController.delegate = self;
    imagePickerController.allowsEditing = YES;
    //相冊(cè)
    UIAlertAction *albumAction = [UIAlertAction actionWithTitle:@"從相冊(cè)選取" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {
        
        imagePickerController.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
        
        [self presentViewController:imagePickerController animated:YES completion:^{}];
    }];
    
    //相機(jī)
    UIAlertAction *photoAction = [UIAlertAction actionWithTitle:@"拍照" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {
        
        imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
        
        [self presentViewController:imagePickerController animated:YES completion:^{}];
    }];

    //取消
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:(UIAlertActionStyleCancel) handler:^(UIAlertAction *action)
                                   {
                                       //這里可以不寫代碼
                                   }];
    [self presentViewController:alertController animated:YES completion:nil];
    
    //用來(lái)判斷來(lái)源 Xcode中的模擬器是沒(méi)有拍攝功能的,當(dāng)用模擬器的時(shí)候我們不需要把拍照功能加速
    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
        
    {
        
        [alertController addAction:albumAction];
        [alertController addAction:cancelAction];
        [alertController addAction:photoAction];
        
    }
    
    else
    {
        [alertController addAction:albumAction];
        [alertController addAction:cancelAction];

        [alertController addAction:photoAction];
    }
    
}

選取完照片后要執(zhí)行的代理方法

• (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
  {
  [picker dismissViewControllerAnimated:YES completion:^{}];
  //選取裁剪后的圖片
  UIImage image = [info objectForKey:UIImagePickerControllerEditedImage];
  / 此處info 有六個(gè)值
  • UIImagePickerControllerMediaType; // an NSString UTTypeImage)
  • UIImagePickerControllerOriginalImage; // a UIImage 原始圖片
  • UIImagePickerControllerEditedImage; // a UIImage 裁剪后圖片
  • UIImagePickerControllerCropRect; // an NSValue (CGRect)
  • UIImagePickerControllerMediaURL; // an NSURL
  • UIImagePickerControllerReferenceURL // an NSURL that references an asset in the AssetsLibrary framework
  • UIImagePickerControllerMediaMetadata // an NSDictionary containing metadata from a captured photo
    */
    _avatarImage.image = image;
    }