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最新推荐文章于 2025-04-26 09:23:38 发布

wangzhen3416

最新推荐文章于 2025-04-26 09:23:38 发布

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分类专栏： iOS开发文章标签：图片

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本文介绍如何在iOS应用中使用UIImagePickerController来实现拍照和从相册选择图片的功能。通过展示具体的代码示例，包括弹出UIAlertController供用户选择操作方式，并实现UIImagePickerControllerDelegate方法来处理用户的选择。

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UIImagePickerController是图片控制器，需要继承UIImagePickerControllerDelegate,UINavigationControllerDelegate代理

点击拍照按钮，模态弹出UIAlertController控制器类，代码如下：

- (void)onCamera
{
    //常用控件
    //UIAlertView 警告视图 (iOS 8.0以前)
    //UIActionSheet        (iOS 8.0以前)

    //UIAlertController    (iOS 8.0以后)
    UIAlertController *ac = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];

    //添加第一个Action，从图片库选择照片
    [ac addAction:[UIAlertAction actionWithTitle:@"从相册选择" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
        [self loadImagePicker:UIImagePickerControllerSourceTypePhotoLibrary];
    }]];

    //添加第二个Action，拍照
    [ac addAction:[UIAlertAction actionWithTitle:@"照相机" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
        [self loadImagePicker:UIImagePickerControllerSourceTypeCamera];
    }]];

    //添加第三个Action，取消
    [ac addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {

    }]];

    //显示页面
    [self presentViewController:ac animated:YES completion:nil];

}

弹出图片控制器

- (void)loadImagePicker:(UIImagePickerControllerSourceType)type
{
    //首先，判断soureType 是否可用
    if ([UIImagePickerController isSourceTypeAvailable:type]) {
        //创建UIImagePickerController对象
        UIImagePickerController *pickerContr = [[UIImagePickerController alloc] init];

        //设置属性
        pickerContr.sourceType = type;
        //设置代理
        pickerContr.delegate = self;

        //显示imagePicker控制器
        [self presentViewController:pickerContr animated:YES completion:nil];
    }else {
        NSLog(@"source type is not available , type = %ld",type);
    }
}

两个代理方法

#pragma mark - 代理方法
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    //返回上一个页面，关闭当前页面
    [picker dismissViewControllerAnimated:YES completion:nil];
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    //info 存储选择的图片
    UIImage *img = info[UIImagePickerControllerOriginalImage];

    self.iv.image = img;

    //关闭页面
    [picker dismissViewControllerAnimated:YES completion:nil];
}