iOS标准图片尺寸

NavigationBar  &  Toolbar                                            TabBar

推荐:   72px  x  72px  (24pt x 24pt  @3x)                75px  x  75px  (25pt x 25pt  @3x)

           48px  x  48px  (24pt x 24pt  @2x)                50px  x  50px  (25pt x 25pt  @2x) 



最大:   84px  x  84px  (28pt x 28pt  @3x)             144px  x  96px  (48pt x 32pt  @3x)

            56px  x  56px  (28pt x 28pt  @2x)               96px  x  64px  (48pt x 32pt  @2x)

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