iOS - Sort mutable array of views by each frame

NSComparator comparatorBlock = ^(UIView *obj1, UIView *obj2) {
 if (obj1.frame.origin.y > obj2.frame.origin.y) {
 return (NSComparisonResult)NSOrderedDescending;
 }

 if (obj1.frame.origin.y < obj2.frame.origin.y) {
 return (NSComparisonResult)NSOrderedAscending;
 }
 return (NSComparisonResult)NSOrderedSame;
};

[array sortUsingComparator:comparatorBlock];

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