照相/图片库

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];}