正确的AutoresizingMask

Question

我有一个视图出现在它的父视图纵向模式的中心，我应该使用什么autoresizemask才能让它也出现在横向模式的中心。它的大小应该保持不变。我只是希望它的原点应该自动移动，这样它就会出现在center.Any帮助中。

我已经给了

[parentView setAutoResizesSubview:YES];

parentView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;

Answer 1

// horizontal
childView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;

// vertical
childView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin;

// both
childView.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin;

Answer 2

Swift 3：

childView.translatesAutoresizingMaskIntoConstraints = false

childView.autoresizingMask = [.flexibleTopMargin, .flexibleBottomMargin, .flexibleLeftMargin, .flexibleRightMargin]

Answer 3

If you are using swift:
// horizontal
childView.autoresizingMask = [.flexibleLeftMargin, .flexibleRightMargin]
// vertical
childView.autoresizingMask = [.flexibleTopMargin, .flexibleBottomMargin]
// both
childView.autoresizingMask = [.flexibleLeftMargin, .flexibleRightMargin, .flexibleTopMargin, .flexibleBottomMargin]