iOS convert number to iphone 6 equivalent and 6 plus equivalent - ios

Question

Lets say I have a 44px x 44px UIView on the iphone 5. What's the formula for converting that to the equivalent pixel size for the iphone 6 and 6 plus??
Like would it be 88 x 88 & 132 x 132 or what?
If I have a 44 x 44 UIView on the iPhone 5, how can I have that same view on 6 and 6 plus proportionately take up the same space on the screen

Answer 1

+(float)convertWidthToEquivalentDeviceWidth:(float)width{
float sizedToWidthDesignedTo = 320.0f;
float actualWidth = [[UIScreen mainScreen] bounds].size.width;
float percentWidth = actualWidth/sizedToWidthDesignedTo;
return width * percentWidth;
}
+(float)convertHeightToEquivalentDeviceHeight:(float)height{
float sizedToHeightDesignedTo = 568.0f;
float actualHeight = [[UIScreen mainScreen] bounds].size.height;
float percentHeight = actualHeight/sizedToHeightDesignedTo;
return height * percentHeight;
}

Answer 2

You can get the width of the screen and divide it to the number you want so you don't need to do code for every single device:
viewWidth = [[UIScreen mainScreen] bounds].size.width / scaleOfYourChoice

Answer 3

Setup constraints for top, leading, trailing space and aspect ratio.
The leading and trailing constraints will make your view change width on bigger phones and the aspect ratio constraint will adjust its height accordingly.

Answer 4

Here's what you do: you set the frame to be 44x44. Then you do nothing else whatsoever. UIKit coordinates are not in pixels; the problem is dealt with for you.
Use -[UIScreen nativeScale] if you're curious how many physical pixels are inside a point. That's effectively the number your UIKit coordinates are being multiplied by to make pixels.
If you instead want your view always to be, say, 36% of the available space, use an equal widths NSLayoutConstraint with a multiplier of 0.36.