how to print barcode in vb.net 2008 Figure 11.2 The image picker is another preprogrammed controller for your use. in Objective-C

Encoder QR Code 2d barcode in Objective-C Figure 11.2 The image picker is another preprogrammed controller for your use.

Figure 11.2 The image picker is another preprogrammed controller for your use.
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Media: images and the camera
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As we mentioned, the iPad requires that you display the UIImagePickerController inside a UIPopoverController. One great thing about this is that you can specify the location on the screen in which the picker appears. The following code displays the UIImagePickerController on the iPad:
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UIImagePickerController *myImagePicker = [[UIImagePickerController alloc] init]; myImagePicker.delegate = self; myImagePicker.allowsEditing = NO; UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:myImagePicker]; [popover presentPopoverFromRect:CGRectMake(0,0,320,480) inView:self.view permittedArrowDirections: UIPopoverArrowDirectionAny animated:YES];
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After you ve created your UIImagePickerController, you need to have its delegate respond to two methods: imagePickerController:didFinishPickingMediaWithInfo: and imagePickerControllerDidCancel:. For the first method, you dismiss the modal view controller (or hide the popover on the iPad) and respond appropriately to the user s picture selection; for the second, you only need to dismiss the controller. Overall, the UIImagePickerController is easy to use because you re mainly reacting to a picture that was selected. Section 11.4 presents a complete example of its use.
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11.3.2 Taking photos
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As we noted earlier, the UIImagePickerController has three possible sources, represented by these constants:
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UIImagePickerControllerSourceTypePhotoLibrary A
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picture
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from
photo library
UIImagePickerControllerSourceTypeSavedPhotosAlbum A picture from the
camera roll UIImagePickerControllerSourceTypeCamera A new picture taken by the camera You should always make sure that the source is available before you launch a UIImagePickerController, although this is most important for the camera. You can confirm that the source exists with the isSourceTypeAvailable: class method:
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
After you ve verified the existence of a source, you can tell the image picker to use it with the sourceType property. For example, to use the camera, do the following:
myImagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
Note that pictures taken in a program go only to that program. If you want them to go into the photo album, your program has to save them there (as we ll discuss momentarily).
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Collage: an image example
NOTE
In our experience, the camera is a bit of a resource hog. More than anything else, this means you need to think about saving your program s state when using the camera, because it could cause you to run out of memory.
We ll present an example of using the camera in section 11.4.
11.3.3 Saving to the photo album
You may wish to save a new photograph to the photo album, or you may wish to place a graphic created by your program there. In either case, you use the UIImageWriteToSavedPhotosAlbum function. It has four variables: the first lists the image, and the other three reference an optional asynchronous notification function to call when the save has been completed. Usually you call the function like this:
UIImageWriteToSavedPhotosAlbum(yourImage,nil,nil,nil);
If you instead want to take advantage of the asynchronous notification, look at the UIKit function reference, which is where this function is hidden, or look at the example in chapter 13. You can use this function (and a bit of trickery) to save the CALayer of a UIView to your photo album, which, for example, lets you save the draw commands that you wrote straight to the CALayer earlier. This again depends on graphical contexts, which we ll explain in the next chapter, but here s how to do it:
UIGraphicsBeginImageContext(myView.bounds.size); [myView.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *collageImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIImageWriteToSavedPhotosAlbum(collageImage,nil,nil,nil);
In order for this to work correctly, you must link in the Quartz Core framework. With all the fundamentals of images now covered, we re ready to put them together in our big example for this chapter. It s a program that collages together multiple pictures, first selecting them with a UIImagePickerController, then allowing them to be moved about with a UIImageView, and finally drawing them to a CALayer that can be saved.
11.4 Collage: an image example
The collage program depends on three objects. The collageViewController, as usual, does most of the work. It writes out to a collageView object, which exists mainly as a CALayer to be written upon. Finally, you ll have a tempImageView object that allows the user to position an image after it s been selected but before it s permanently placed. For this example, the code will be written to deploy the collage application to the iPhone. To learn how to port it to the iPad, be sure to read appendix D; it contains step-by-step instructions for porting this app as well as your own apps to the iPad.
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