在我当前的应用程序中,我允许用户在线将图像提交到图像服务。我允许用户从他们的相册中选择或使用相机拍照。
但是,我有一个问题。如果正在使用的设备没有相机,而用户选择拍照,则应用程序崩溃。我需要确定该设备是否具有使用cameraDevice的能力。
以下是我当前用于呈现UIActionSheet的代码,该UIActionSheet允许用户选择不同的选项。
#pragma mark -
#pragma mark UIImagePickerController
- (IBAction)ImagePicker {
UIActionSheet *sheet = [[UIActionSheet alloc]
initWithTitle:@"" delegate:self
cancelButtonTitle:@"Cancel"
destructiveButtonTitle:nil
otherButtonTitles:@"Choose An Existing Photo", @"Take A Photo", nil];
sheet.actionSheetStyle = UIActionSheetStyleDefault;
[sheet showInView:self.view];
[sheet release];
}
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex == 0) {
//Okay the UIImagePickerControllerSourceTypeSavedPhotosAlbum displays the
NSLog(@"Album");
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
[self presentModalViewController:picker animated:YES];
[picker release];
} else if (buttonIndex == 1) {
NSLog(@"Camera");
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentModalViewController:picker animated:YES];
[picker release];
}
}
提前致谢!
最佳答案
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { NSLog(@"No camera!"); }