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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 that there s a Done button available, along with a slider.
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At this point, the user will be able to do three things:
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Use UITouches to move the image view (which is covered in the tempImageView class, because that s where the touches go, as we saw in chapter 14). Use the slider to change the size of the picture. Click Done to accept the image size and location.
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The end results of what can be produced are shown in figure 18.3. Note that if the user instead canceled the image picker, your imagePickerControllerDidCancel: method would correctly shut down the modal controller F. The UISlider was hooked up to the rescalePic: method G. It redraws the frame of the UIImageView, which automatically resizes the picture inside. Meanwhile, the Done button activates the finishPic: method H. This sends a special addPic:at: message to the collageView, which is where the CALayer drawing is done, and which we ll return to momentarily. finishPic: also dismisses the UISlider and the tempImageView and resets the toolbar to its original setup. That original toolbar had one more button that we haven t covered yet: Save. It activates the savePic: method I, which saves a CALayer to the photo library. Note that this method temporarily hides toolbar in the process. Because the toolbar is a subview of the UIView, Figure 18.3 The collager it d get included in the picture if you didn t do this. in use displays many The last method, scaleImage: J, is the utility that photos simultaneously. sets each image to fill about a quarter of the screen. This code has two dangling parts: the methods in the tempImageView, which allow a user to move the UIImageView, and the methods in the collageView, which later draw the image into a CALayer.
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18.4.2 The collage temporary image view The tempImageView class only has one purpose: to intercept UITouches that indicate that the user wants to move the new image to a different part of the collage. This simple code is shown in listing 18.4.
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Collage: an image example Listing 18.4 A temporary image can be moved about by touches
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- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *thisTouch = [touches anyObject]; CGPoint thisPoint = [thisTouch locationInView:self]; float newX = thisPoint.x+self.frame.origin.x; float newY = thisPoint.y+self.frame.origin.y; if (newX < 0) { newX = 0; } else if (newX > 320) { newX = 320; } if (newY < 0) { newY = 0; } else if (newY > 416) { newY = 416; } self.center = CGPointMake(newX,newY); }
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Determines position in view
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Calculates overall position
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This is similar to the touch code that you wrote in chapter 14, and it isn t worthy of a lot of additional commentary. Recall that locationInView: B gives a CGPoint internal to the view s coordinate system and needs to be converted C into the global coordinate system of the application. In testing, we discovered that when run on an iPhone (but not in the iPhone Simulator) the result could sometimes be out of bounds, so you need to double-check your coordinates before you move the temporary image view.
18.4.3 The collage view Last up, we have the collageView itself, which is the background UIView that needs to respond to the addPic:at: message and draw onto the CALayer with drawRect:. The code to do this is shown in listing 18.5.
Listing 18.5 A background view manages the low-level drawing once an image is set
-(void)addPic:(UIImage *)newPic at:(CGRect)newLoc {
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if (! myPics) { myPics = [[NSMutableArray alloc] initWithCapacity:0]; [myPics retain]; } [myPics addObject:[NSDictionary dictionaryWithObjectsAndKeys: newPic,@"picture", [NSNumber numberWithFloat:newLoc.origin.x],@"xpoint", [NSNumber numberWithFloat:newLoc.origin.y],@"ypoint", [NSNumber numberWithFloat:newLoc.size.width],@"width", [NSNumber numberWithFloat:newLoc.size.height],@"height", nil]]; [self setNeedsDisplay];
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