選擇圖片——相機與相冊

- (IBAction)touchSelectImg:(id)sender {
    //在這裏呼出下方菜單按鈕項
    UIActionSheet *myActionSheet = [[UIActionSheet alloc]
                     initWithTitle:nil
                     delegate:self
                     cancelButtonTitle:@"取消"
                     destructiveButtonTitle:nil
                     otherButtonTitles: @"打開照相機", @"從手機相冊獲取",nil];
    [myActionSheet showInView:self.view];
}

<UINavigationControllerDelegate,UIImagePickerControllerDelegate,UIActionSheetDelegate>

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    //呼出的菜單按鈕點擊後的響應
    if (buttonIndex == actionSheet.cancelButtonIndex){
        NSLog(@"取消");
    }else{
        switch (buttonIndex){
            case 0:  //打開照相機拍照
                [self takePhoto];
                break;
            case 1:  //打開本地相冊
                [self LocalPhoto];
                break;
        }
    }
}

//開始拍照
-(void)takePhoto
{
    UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;
    if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])
    {
        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        picker.delegate = self;
        //設置拍照後的圖片可被編輯
        picker.allowsEditing = YES;
        picker.sourceType = sourceType;
        [self presentViewController:picker animated:YES completion:nil];
    }else
    {
        NSLog(@"模擬其中沒法打開照相機,請在真機中使用");
    }
}
//打開本地相冊
-(void)LocalPhoto
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    picker.delegate = self;
    //設置選擇後的圖片可被編輯
    picker.allowsEditing = YES;
    [self presentViewController:picker animated:YES completion:nil];
}


//當選擇一張圖片後進入這裏
-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    NSString *type = [info objectForKey:UIImagePickerControllerMediaType];
    //當選擇的類型是圖片
    if ([type isEqualToString:@"public.image"])
    {
        UIImage* image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
        [picker dismissViewControllerAnimated:YES completion:nil];
    }
}
//您取消了選擇圖片
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    NSLog(@"您取消了選擇圖片");
    [picker dismissViewControllerAnimated:YES completion:nil];
}