UIImagePickerController和UIAlertController结合使用

在处理个人资料 - 头像的时候，通常有两个选项，一个是调用系统相机，一个是调用系统相册。这里要使用的就是UIImagePickerController方法。

在头像位置的imageView添加一个手势，或者添加一个透明的按钮，用来实现click方法，直接上代码：

- (IBAction)click:(id)sender{

    //创建提醒视图

    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提醒" message:nil preferredStyle:UIAlertControllerStyleActionSheet];

    UIAlertAction *alertAction = [UIAlertAction actionWithTitle:@"相机" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action) {

         //判断设备是否存在摄像头，有就调用系统相机，没有，就提醒用户

        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

            //创建相机

            UIImagePickerController *picker = [[UIImagePickerController alloc] init];

            //文件由来

            picker.sourceType = UIImagePickerControllerSourceTypeCamera; //指定数据来源来自于相机

            picker.delegate  = self;// 指定代理

            picker.allowsEditing = YES; //允许编辑

            //模态弹出

            [self presentViewController:picker animated:YES completion:nil];

        }else{

            //没有摄像头，提醒用户 您的设备没有摄像头

            UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"您的设备没有摄像头" message:nil preferredStyle:UIAlertControllerStyleAlert];

            UIAlertAction *alertAction1 = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:nil];

            [alertController addAction:alertAction1];

            [self presentViewController:alertController animated:YES completion:nil];

        }

    }];

    [alertController addAction:alertAction];

    UIAlertAction *alertAction2 = [UIAlertAction actionWithTitle:@"相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {

        UIImagePickerController *pickerC = [[UIImagePickerController alloc] init];

        pickerC.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;//指定数据来源为相册

        pickerC.delegate = self;  //指定代理

        pickerC.allowsEditing = YES;  // 允许编辑

        [self presentViewController:pickerC animated:YES completion:nil];

    }];

    [alertController addAction:alertAction2];

    [self presentViewController:alertController animated:YES completion:nil];

}

//选取图片之后执行的方法

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{

    NSLog(@"%@",info);

    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

    self.photoImage.image = image;

    [picker dismissViewControllerAnimated:YES completion:nil];

}