Making view resize to its parent when added with a

问题:

I'm having a problem when using addSubview.

Example code:

ParentView *myParentView = [[ParentView alloc] initWithNibName:@"ParentView " bundle:nil];
ChildeView *myChildeView = [[ChildeView alloc] initWithNibName:@"ChildeView" bundle:nil];

//...  parent frame resized with setFrame lets say to x:0, y:0, W:320, H:411

[[myParentView view] addSubview: [myChildeView view]];

My child when added is bigger then the parent, and does not resize its frame to parent bounds. I can't use "clip subviews" on the parent, and "Autoresize Subviews" seems not to work if the parent frame is not resized again. Is there a property that makes a subview resize automatically to its parent's bounds without using setFrame on every child?

回答1:

If you aren’t using Auto Layout, have you tried setting the child view’s autoresize mask? Try this:

myChildeView.autoresizingMask = (UIViewAutoresizingFlexibleWidth |
                                 UIViewAutoresizingFlexibleHeight);

Also, you may need to call

myParentView.autoresizesSubviews = YES;

to get the parent view to resize its subviews automatically when its frame changes.

If you’re still seeing the child view drawing outside of the parent view’s frame, there’s a good chance that the parent view is not clipping its contents. To fix that, call

myParentView.clipsToBounds = YES;

回答2:

Just copy the parent view's frame to the child-view then add it. After that autoresizing will work. Actually you should only copy the size CGRectMake(0, 0, parentView.frame.size.width, parentView.frame.size.height)

childView.frame = CGRectMake(0, 0, parentView.frame.size.width, parentView.frame.size.height);
[parentView addSubview:childView];

回答3:

Tested in Xcode 9.4, Swift 4 Another way to solve this issue is , You can add

override func layoutSubviews() { self.frame = (self.superview?.bounds)! }

in subview class.

回答4:

You can always do it in your UIViews - (void)didMoveToSuperview method. It will get called when added or removed from your parent (nil when removed). At that point in time just set your size to that of your parent. From that point on the autoresize mask should work properly.

回答5:

that's all you need

childView.frame = parentView.bounds