iOS 打开相册或相机

iOS图片 : 打开相机或打开相册

首先, 在应用中打开相机或者是打开相册都会有一个弹窗之类的,让用户选择到底是打开相册,还是打开相机

这里我们以弹出对话框为例

首先对 UIImageView 添加一个轻拍手势, 在轻拍手势的方法中创建一个 UIActionSheet 的对象

//在本类中要遵从 UIActionSheetDelegate 协议

UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:@"获取照片" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"相册", @"拍照", nil];

[sheet showInView:self.view];

[sheet release];

给 UIActionSheet 对象添加响应事件

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
switch (buttonIndex) {
case 0:
//从相册中读取
[self readImageFromAlbum];
break;
case 1:
//拍照
[self readImageFromCamera];
break;
case 2:
break;
default:
break;
}
}

//从相机中读取相片
-(void)readImageFromAlbum {
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];//创建对象
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;//（选择类型）表示仅仅从相册中选取照片
imagePicker.delegate = self;//指定代理，因此我们要实现UIImagePickerControllerDelegate,  UINavigationControllerDelegate协议
imagePicker.allowsEditing = YES;//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)
[self presentViewController:imagePicker animated:YES completion:nil];//显示相册
[imagePicker release];
}

//拍照
-(void)readImageFromCamera {
//判断选择的模式是否为相机模式，如果没有弹窗警告
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.allowsEditing = YES;//允许编辑
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePicker.delegate = self;
[self presentViewController:imagePicker animated:YES completion:nil];
[imagePicker release];
} else {
//弹出窗口响应点击事件
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"警告" message:@"未检测到摄像头" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];//警告。。确认按钮
[alert show];
[alert release];
}
}

//在本类中需要遵从 UIImagePickerControllerDelegate 协议
//图片编辑完成之后触发, 显示图片在button上
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo {
//参数image 就是最终选择的图片
HeaderView *header = (HeaderView*)self.tableView.tableHeaderView;
[header.iconView setImage:image forState:(UIControlStateNormal)];
[self dismissViewControllerAnimated:YES completion:nil];
}

至此 , 就可以打开相机或相册了!