1    2   3 1.  4   5 UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:                               @"设置头像" delegate:self cancelButtonTitle:@"取消"                       destructiveButtonTitle:nil otherButtonTitles:@"选择本地图片",@"拍照", nil];  6   7     [actionSheet showInView:self.view];  8   9   10  11 //2.实现相应代理事件,代理UIActionSheetDelegate,方法如下 12  13   14  15 - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:                                                       (NSInteger)buttonIndex { 16  17     // 相册 0 拍照 1 18  19     switch (buttonIndex) { 20  21         case 0: 22  23             //从相册中读取 24  25             [self readImageFromAlbum]; 26  27             break; 28  29         case 1: 30  31             //拍照 32  33         [self readImageFromCamera]; 34  35         break; 36  37         default: 38  39         break; 40  41     } 42  43 } 44  45   46  47 //3.实现从相册读取图片功能,代码如下 48  49   50  51   52  53 //从相册中读取 54  55 - (void)readImageFromAlbum { 56  57     //创建对象 58  59     UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init]; 60  61     //（选择类型）表示仅仅从相册中选取照片 62  63     imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 64  65     //指定代理，因此我们要实现UIImagePickerControllerDelegate,                                                 UINavigationControllerDelegate协议 66  67     imagePicker.delegate = self; 68  69     //设置在相册选完照片后，是否跳到编辑模式进行图片剪裁。(允许用户编辑) 70  71     imagePicker.allowsEditing = YES; 72  73     //显示相册 74  75     [self presentViewController:imagePicker animated:YES completion:nil]; 76  77 } 78  79   80  81 //4.实现拍照功能 82  83   84  85 - (void)readImageFromCamera { 86  87     if ([UIImagePickerController isSourceTypeAvailable:                                           UIImagePickerControllerSourceTypeCamera]) { 88  89         UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];         imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;         imagePicker.delegate = self; 90  91         imagePicker.allowsEditing = YES; 92  93         //允许用户编辑 94  95         [self presentViewController:imagePicker animated:YES completion:nil]; 96  97     } else { 98  99         //弹出窗口响应点击事件100 101         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"警告"                         message:@"未检测到摄像头" delegate:nil cancelButtonTitle:nil                                                 otherButtonTitles:@"确定", nil];102 103         [alert show];104 105     }106 107 }108 109  110 111 //5.图片完成处理后提交,代理方法UIPickerControllerDelegate112 113  114 115 //图片完成之后处理116 117 - (void)imagePickerController:(UIImagePickerController *)picker        didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo {118 119     //image 就是修改后的照片120 121     //将图片添加到对应的视图上122 123     [_headImageView setImage:image];124 125     //结束操作126 127     [self dismissViewControllerAnimated:YES completion:nil];128 129 }130 131