iOS, some questions about camera control

Question

I am newbie to iOS programming.

I have a few simple questions.

1. After picking image from gallery or taking a picture from camera, I want to select

rectangle area like android

UIImagePickerController * picker =[[UIImagePickerController alloc] init];
picker.delegate=self;
picker.allowsEditing=YES;
picker.sourceType=UIImagePickerControllerSourceTypeCamera;

[self presentViewController:picker animated:YES completion:nil];

When I use this code, I can't resize my area as you see below

.

2. It is related to first question.

As you see my image is resized and changed to different ratio.

But I want image is fixed with original ratio.

3. Anyone knows how to use camera in iOS simulator?

Answer 1

Question 3: You cannot use the camera function in simulator. That is one of the limitations. See this document from Apple Developer page: https://developer.apple.com/library/ios/documentation/IDEs/Conceptual/iOS_Simulator_Guide/TestingontheiOSSimulator/TestingontheiOSSimulator.html

Question 2: below

This is answer is from this link: How to make UIImageView automatically resize to the size of the image loaded

UIImage img = [UIImage imageNamed:@"myImage.jpg"];
[imageView setImage:img];
imageView.frame = CGRectMake(imageView.frame.origin.x, imageView.frame.origin.y,
                         img.size.width, img.size.height);

"This will however not change the layout of view it is contained within, you can make it change the sizes of the other views automatically under iOS 6 using Layout Constraints. If you are an Apple Developer you can watch the WWDC instruction videos, they explain how that system works quite well."

It's the best answer I have as it is the way I use setting image sizes in a view.