How to replicate the launch image in iOS - ios

Question

My main app has to do some work in a webview, so I want to keep the launch image up longer while this work takes place. To do this, I created a controller with a UIImageView and I'm loading the Default image up in it:
self.imageView.image = [UIImage imageNamed:"Default"];
// These all tend to fill the screen, but end up distorting the image
//self.imageView.contentMode = UIViewContentModeScaleAspectFill;
//self.imageView.contentMode = UIViewContentModeScaleAspectFit;
//self.imageView.contentMode = UIViewContentModeScaleToFill;
// This keeps the aspect the same, but doesn't fill the screen
self.imageView.contentMode = UIViewContentModeCenter;
This mostly works, except when the real launch image goes away and is replaced with mine, I have two white bars - one at the top and one at the bottom - where the image doesn't completely fill. I've tried to set the contentMode to the various fill/fit's, and even though this has the desired effect of filling the full screen, it stretches and distorts the image slightly.
So what I'm wondering is - what does the launch image do that I'm not doing? How can I replicate the display exactly so that the user can't tell it's a different image?

Answer 1

Like in your project I use a launch image and then in the first UIViewController called I have an UIImageView inside. The image resolution, must be exactly the same as the screen's definition.
The code in the UIViewController is something like this :
CGRect fullFrame = [[UIScreen mainScreen] bounds];
// Img Background
UIImageView *background;
if (fullFrame.size.height <= 480) {
background = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"image-480h.png"]];
}
else if (fullFrame.size.height <= 568) {
background = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"image-568h.png"]];
}
else if (fullFrame.size.height <= 668) {
background = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"image-668h.png"]];
}
else {
background = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"image-736h.png"]];
}
background = CGRectMake(0, 0, frame.size.width, fullFrame.size.height);
myMainView = [[UIView alloc] initWithFrame:frame];
[myMainView addSubview:background];
self.view = myMainView;
I check the different screen size depending on the iPhone 4, 5, 6 and 6 plus.