iPhone-iPad Development Tips

1. Screen Resolution;

iPhones are available in different screen resolutions; It is in 320×480 and the iPhone 4 screen resolution is 640×960. Same in caes of iPad; Currently it is 1024×768 and iPad 2 likely to have 2048×1536 screen resolution; So we need to care about this while playing with layouts; Here is a code to determine screen size;

CGRect currentScreen = [[UIScreen mainScreen] bounds];
currentScreen.size.width will return the width of screen;
currentScreen.size.height will return height of screen;

Note: If you rotate your screen to landscape, then height will become width and vise versa;

2. Device Type;

Following piece of code will tell you whether your application is running on iPhone or iPad;

UIDevice* currentDevice = [UIDevice currentDevice];
if(currentDevice.userInterfaceIdiom == UIUserInterfaceIdiomPad) {
NSLog(@"oh its iPad");
}else{
NSLog(@"This is iPhone");
}

3. Current iOS version;

UIDevice* currentDevice = [UIDevice currentDevice];
float systemVersion = [currentDevice.systemVersion floatValue];

This float value will tell you the current iOS version of device;

4. Current Orientation;

It is common to have different layout for single application in portrait and/or landscap view; In case of iPad it become more significant; Following method will tell you the current orientation of user’s device;


-(int) currentLayout{
if (([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortrait ||

[[UIApplication sharedApplication] statusBarOrientation] == UIDeviceOrientationPortraitUpsideDown))

// do something for portrait view;

else

// do something for landscape view;
}