Altenative [UIScreen mainScreen].nativeScale for iOS 7 support? - ios

Question

does anyone know an alternative to the following code? I want to support iOS 7 and below in my app and .nativeScale does not work on these firmwares. I could not find a solution on the internet that's why I am asking here. (normally letting screenbounds check for height of 568 does not work for iPhone 6+)
The Code I'm referring to:
CGRect screenBounds = [[UIScreen mainScreen] bounds];
if ([UIScreen mainScreen].nativeScale > 2.1) {
//6 plus
} else if (screenBounds.size.height == 568) {
//4 inch / iPhone 6 code
} else {
//3.5 inch code
}
Thanks in advance

Answer 1

So what I did was:
First I had the methods in the following order:
if ([UIScreen mainScreen].nativeScale > 2.1) {
//6 plus
} else if (screenBounds.size.height == 568) {
//4 inch code
} else {
//3.5 inch code
}
Then I thought since the computer stops running the if else statement once he finds a true one I just rearranged the order to the following:
if (screenBounds.size.height == 480) {
//3.5 inch code
} else if ([UIScreen mainScreen].nativeScale > 2.1) {
//6 plus
} else if (screenBounds.size.height == 568) {
//4 inch code
}
This supported an iPhone 4S with iOS 7 or below. On iPhone 5 / 5S it would still crash. That's why I changed it in the end to the following:
if ([[UIScreen mainScreen] respondsToSelector:#selector(nativeScale)]) {
//checks if device is running on iOS 8, skips if not
NSLog(#"iOS 8 device");
if (screenBounds.size.height == 480) {
//3.5 inch code
NSLog(#"iPhone 4S detected");
} else if ([UIScreen mainScreen].nativeScale > 2.1) {
//6 plus
NSLog(#"iPhone 6 plus detected");
} else if (screenBounds.size.height == 568) {
//4 inch code
NSLog(#"iPhone 5 / 5S / 6 detected");
}
} else if (screenBounds.size.height == 480) {
//checks if device is tunning iOS 7 or below if not iOS 8
NSLog(#"iOS 7- device");
NSLog(#"iPhone 4S detected");
//3.5 inch code
} else if (screenBounds.size.height == 568) {
NSLog(#"iOS 7- device");
NSLog(#"iPhone 5 / 5S / 6 detected");
//4 inch code
}
It should now fully work on any iOS 7 an iOS 8 device!