iphone下添加系统图片和拍照

最新推荐文章于 2024-03-20 09:40:54 发布

原创最新推荐文章于 2024-03-20 09:40:54 发布 · 384 阅读

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本文探讨了在iPad环境中使用UIImagePickerController获取照片库时遇到的问题及解决方案。通过UIPopoverController的引入，成功解决了无法直接调用UIImagePickerController的问题。

- (void)addPhoto

{

UIImagePickerController * imagePickerController = [[UIImagePickerControlleralloc]init];

imagePickerController.navigationBar.tintColor = [UIColorcolorWithRed:72.0/255.0green:106.0/255.0blue:154.0/255.0alpha:1.0];

imagePickerController.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;

imagePickerController.delegate =self;

imagePickerController.allowsEditing =NO;

[selfpresentModalViewController:imagePickerController animated:YES];

[imagePickerController release];

}

- (void)takePhoto

{

if (![UIImagePickerControllerisSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])

{

UIAlertView *alert = [[UIAlertViewalloc] initWithTitle:nil

message:@"该设备不支持拍照功能"

delegate:nil

cancelButtonTitle:nil

otherButtonTitles:@"好",nil];

[alert show];

[alert release];

}

else

{

UIImagePickerController * imagePickerController = [[UIImagePickerControlleralloc]init];

imagePickerController.sourceType =UIImagePickerControllerSourceTypeCamera;

imagePickerController.delegate = self;

imagePickerController.allowsEditing =NO;

[self presentModalViewController:imagePickerControlleranimated:YES];

[imagePickerController release];

}

我们知道，在iPhone中获取照片库常用的方法如下：

这对iPhone的操作是没有问题的。但是当我们在iPad环境中却有问题了，当我们运行时会报如下错误：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'On iPad, UIImagePickerController must be presented via UIPopoverController'

所以我们必须通过UIPopoverController来实现才行。具体实现如下：

UIImagePickerController *m_imagePicker = [[UIImagePickerController alloc] init];
    if ([UIImagePickerController isSourceTypeAvailable:
        UIImagePickerControllerSourceTypePhotoLibrary]) {
        m_imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        m_imagePicker.delegate = self;
        [m_imagePicker setAllowsEditing:NO];
        UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:m_imagePicker];
        self.popoverController = popover;
        //popoverController.delegate = self;

        [popoverController presentPopoverFromRect:CGRectMake(0, 0, 300, 300) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

        //[self presentModalViewController:m_imagePicker animated:YES];
        [popover release];
        [m_imagePicker release];
    }else {
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:nil message:@"Error accessing photo library!" delegate:nil cancelButtonTitle:@"Close" otherButtonTitles:nil];
        [alert show];
        [alert release];
    }
这里需要注意，对局部UIPopoverController对象popover我们赋给了一个全局的UIPopoverController对象popoverController。而不能直接调用popover。因为在popover对象还可见时，是不能够被释放的。