如何使用自动布局更改按钮的大小？

Question

I was wondering how I can change a button's size.

Example: 2x1 button when in portrait mode. 1x2 button when in landscape mode.

Can I do this in storyboard with autolayout or do I have to do this programmatically?

Answer 1

While adding button,just add

[self.view addSubView self.tableButton];

and in

- (void)viewWillLayoutSubviews {

[self.tableConstraintWidth autoRemove];
[self.tableConstraintLeft autoRemove];
[self.tableConstraintHeight autoRemove];
[self.tableConstraintTop autoRemove];

//Assign again with different constraints depending on the orientation

Check orientation

if(Landscape) {

self.tableConstraintLeft = Left constraint
self.tableConstraintTop = Top Constraint
self.tableConstraintWidth = Width Constraint
self.tableConstraintHeight = Height Constraint

}else {

self.tableConstraintLeft = Left constraint
self.tableConstraintTop = Top Constraint
self.tableConstraintWidth = Width Constraint
self.tableConstraintHeight = Height Constraint

 }

}