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11.4.1 The collage view controller
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The collage view controller is built on a few Interface Builder objects: the view controller itself; a toolbar called myTools, which will be filled over the course of the program; and the collageView UIView class, which exists as its own class file and is referred to in the program as self.view. You also need to add the Quartz Core framework to your project because you ll use the save-picture trick that we just discussed. Listing 11.2 shows the complete view controller, which is the most extensive file in this program.
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Listing 11.2 A view controller, which manages most of the collage s tasks
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@implementation collageViewController - (void)viewDidLoad { UIBarButtonItem *picButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(choosePic:)]; UIBarButtonItem *camButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:@selector(takePic:)]; UIBarButtonItem *saveButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(savePic:)]; picButton.style = UIBarButtonItemStyleBordered; camButton.style = UIBarButtonItemStyleBordered; if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { origToolbar = [[NSArray alloc] initWithObjects: picButton,camButton,saveButton,nil]; } else if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) { origToolbar = [[NSArray alloc] initWithObjects: picButton,saveButton,nil]; } else { exit(0); } [myTools setItems:origToolbar animated:NO]; [picButton release]; [camButton release]; [super viewDidLoad]; } -(IBAction)choosePic:(id)sender { UIImagePickerController *myImagePicker = [[UIImagePickerController alloc] init]; myImagePicker.delegate = self; myImagePicker.allowsImageEditing = NO; [self presentModalViewController:myImagePicker animated:YES]; } -(IBAction)takePic:(id)sender { UIImagePickerController *myImagePicker = [[UIImagePickerController alloc] init]; myImagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; myImagePicker.delegate = self; myImagePicker.allowsImageEditing = NO;
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Collage: an image example
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[self presentModalViewController:myImagePicker animated:YES]; } - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo { Responds to [self dismissModalViewControllerAnimated:YES]; image selection [picker release]; float percentage = [self scaleImage:image] / 2; startingSize = CGSizeMake(image.size.width*percentage, image.size.height*percentage); myImageView = [[tempImageView alloc] initWithFrame:CGRectMake(80,115, startingSize.width,startingSize.height)]; myImageView.image = image; myImageView.userInteractionEnabled = YES; [self.view addSubview:myImageView]; [myTools setItems:[NSArray arrayWithObject:[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(finishPic:)]] animated:YES]; mySlider = [[UISlider alloc] initWithFrame:CGRectMake(90,415,210,44)]; mySlider.value = .5; [mySlider addTarget:self action:@selector(rescalePic:) forControlEvents:UIControlEventValueChanged]; [self.view addSubview:mySlider]; Responds to } picker cancellation - (void)imagePickerControllerDidCancel: (UIImagePickerController *)picker { [self dismissModalViewControllerAnimated:YES]; [picker release]; } -(void)rescalePic:(id)sender { myImageView.frame = CGRectMake(myImageView.frame.origin.x, myImageView.frame.origin.y, startingSize.width * mySlider.value * 2, startingSize.height * mySlider.value * 2); } -(void)finishPic:(id)sender { [self.view addPic:myImageView.image at:myImageView.frame]; [myImageView removeFromSuperview]; [myImageView release]; [mySlider removeFromSuperview]; [mySlider release]; [myTools setItems:origToolbar animated:NO]; } -(void)savePic:(id)sender { UIGraphicsBeginImageContext(self.view.bounds.size); myTools.hidden = YES; [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *collageImage = UIGraphicsGetImageFromCurrentImageContext(); myTools.hidden = NO; UIGraphicsEndImageContext(); UIImageWriteToSavedPhotosAlbum(collageImage,nil,nil,nil); } -(float)scaleImage:(UIImage *)image { float toSize = 1.0; if (image.size.width * toSize > 320) {
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toSize = 320 / image.size.width; } if (image.size.height * toSize > 460) { toSize = 460 / image.size.height; } return toSize; } // ... @end
Although long, this code is simple to follow in bite-size chunks. It starts with viewDidLoad:, which sets up the UIToolBar. We ve long lauded Interface Builder, but we ve also said that it may not be sufficient when you re creating more dynamic projects. That s the case here. You can t efficiently fill the UIToolBar in Interface Builder because you ll be changing it based on the program s state. You place buttons on the toolbar that call three methods: choosePic:, takePic: (when a camera s available), and the savePic: method. choosePic: and takePic: are similar methods. Each calls up the image picker controller, but the first one accesses the photo library and the second one lets the user take a new picture. The wonder of these modal controllers is that you don t have to do a thing between the time when you create the picker and the point at which the user either selects a picture or cancels. When the user selects a picture, imagePickerControl:didFinishPickingImage:editingInfo: is called B, returning control to your program. Here you do four things:
Dismiss the modal view controller. Look at the picture you ve been handed, and resize it to fill a quarter or less of the screen. Instantiate the image as a tempImageView object, which is a subclass of UIImageView. Change the toolbar so a Done button is available, along with a slider.
At this point, the user can do three things: Use UITouches to move the image view (which is covered in the tempImageView class, because that s where the touches go, as you saw in chapter 6). Use the slider to change the size of the picture. Click Done to accept the image size and location. The end results of what can be produced are shown in figure 11.3. Note that if the user instead cancels the image picker, your imagePickerControllerDidCancel: method correctly shuts down the modal controller C. The UISlider is hooked up to the rescalePic: method. It redraws the frame of the UIImageView, which automatically resizes the picture inside. Meanwhile, the Done button activates the finishPic: method. This sends a special addPic:at: message to the collageView, which is where the CALayer drawing is done, and which we ll return
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