-
They have to do with languages where the text flows from right to left (known appropriately as RTL languages). So, for english, LEADING==LEFT and TRAILING==RIGHT, but for RTL, LEADING==RIGHT and TRAILING==LEFT. Using leading and trailing will make your app more RTL locale friendly.
-
ALIGN_JUSTIFIED? Where are you getting that from?
-
Performance. If you have a bunch of labels prefixed with when its not needed, you’ll suffer a performance hit. You’ll only notice it with hundreds of labels on the screen though…