Set UIView's autoresizing mask programmaticall

问题:

I have to set autoresizingMask programmatically for UIView.

I don't know how to implement this.

回答1:

To achieve what you have in that screen shot you need to do the opposite of what DrummerB suggests. You want a fixed top margin so you make every other side flexible like so:

Objective C:

view.autoresizingMask = UIViewAutoresizingFlexibleRightMargin |
                        UIViewAutoresizingFlexibleLeftMargin |
                        UIViewAutoresizingFlexibleBottomMargin;

Not setting a side as flexible means that it will be fixed (default behaviour), thats why there is no such thing as UIViewAutoResizingFixedTopMargin (since its the same as not setting UIViewAutoresizingFlexibleTopMargin)

Edit for Swift:

view.autoresizingMask = [.FlexibleRightMargin, .FlexibleLeftMargin, .FlexibleBottomMargin]

Credit to Tom Calmon for adding the swift version 1st.

Cheers.

回答2:

You have to set the view's autoresizingMask property:

view.autoresizingMask = UIViewAutoresizingFlexibleTopMargin;

The possible values are defined in UIViewAutoresizing:

enum {
   UIViewAutoresizingNone                 = 0,
   UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,
   UIViewAutoresizingFlexibleWidth        = 1 << 1,
   UIViewAutoresizingFlexibleRightMargin  = 1 << 2,
   UIViewAutoresizingFlexibleTopMargin    = 1 << 3,
   UIViewAutoresizingFlexibleHeight       = 1 << 4,
   UIViewAutoresizingFlexibleBottomMargin = 1 << 5
};
typedef NSUInteger UIViewAutoresizing;

You can set multiple values with the bitwise OR operator |.

回答3:

Swift 2.0:

view.autoresizingMask = [.FlexibleRightMargin, .FlexibleLeftMargin, .FlexibleBottomMargin]

回答4:

Swift 4.1:

view.autoresizingMask = [.flexibleHeight, .flexibleWidth, .flexibleTopMargin, .flexibleRightMargin, .flexibleLeftMargin, .flexibleBottomMargin]

回答5:

To set flexible Top Margin,Bottom Margin,Left Margin and Right Margin of a UIView write the following code-

autoresizingMask=UIViewAutoresizingFlexibleTopMargin|UIViewAutoresizingFlexibleBottomMargin|UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingFlexibleRightMargin;