Ios application screen compatibility

Before ipone 4S, we didn't seem to think too much about screen compatibility, because iphone smart helped us solve it, for example, iphone 3g iphone 3gs for 320*480 iphone 4 iphone 4S for 640*960 we often provide a xx@2x.png if it's a Retina screen, iphone chooses a realistic @ 2x image for itself. The iphone 5 is 640x1136, 176 pixels higher than 4 and 4 s. If we consider screen compatibility, we can determine whether the iphone 5 is like this. If it is 5, we will do some special processing, for example, if it is 5, we will increase the size of the view, etc. # define isIPhone5 ([UIScreen instancesRespondToSelector: @ selector (currentMode)]? CGSizeEqualToSize (CGSizeMake (640,113 6), [[UIScreen mainScreen] currentMode]. size): NO) 2 directly use the ratio. When setting the size, we do not write the data to death, but only provide some proportions. # Define ScreenHeight [[UIScreen mainScreen] bounds]. size. height # define ScreenWidth [[UIScreen mainScreen] bounds]. size. width # define StateBarHeight 20 # define MainHeight (ScreenHeight-StateBarHeight) # define MainWidth ScreenWidth 3 autoLayout. 4. If there is an xib file, we can address different situations, create multiple xib files. For example, for some complex la S, we may need to build a horizontal, vertical, and xib for 5.