UIViewContentModeScaleTo
Fill,
UIViewContentModeScaleAs
pectFit,
// contents scaled to fit with fixed aspect. remainder is transparent
UIViewContentModeScaleAs
pectFill,
// contents scaled to fill with fixed aspect. some portion of content may be clipped.
UIViewContentModeRedraw,
// redraw on bounds change (calls -setNeedsDisplay)
UIViewContentModeCenter,
// contents remain same size. positioned adjusted.
UIViewContentModeTop,
UIViewContentModeBottom,
UIViewContentModeLeft,
UIViewContentModeRight,
UIViewContentModeTopLeft
,
UIViewContentModeTopRigh
t,
UIViewContentModeBottomL
eft,
UIViewContentModeBottomR
ight,
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