IOS6 and iOS7 navigation bar differences

Before explaining the AutoLayout of the iOS6 and iOS7 navigation bar differences, or through a simple diagram, a coordinate of (0,0,320,200) ImageView, that is, y coordinate 0, such as,

IOS6 's,

IOS7 's,

Can see the obvious difference, ImageView in the iOS7 system above, the above section of the content is blocked by the navigation bar and the status bar.

All navigation bars in the iOS7 are translucent, the navigation bar (height=44) and the status bar (height=20) no longer occupy a single height, i.e. the view's (0,0) coordinates start at the upper-left corner of the screen, whereas in systems prior to iOS7, the navigation bar and the status bar occupy a separate height, That is, the coordinates of the view (0,0) start below the navigation bar.

IOS6 and iOS7 navigation bar differences