Change height of view programmatically in uistackview - ios

Question

I need to change the view height in the stack view when I press the test button, but it is not working properly.
When I press the test button, I want to set the height of view 3 to 50 and the height of view5 to fill the remaining area. When I press the test button again, i want to reverse to process. How can I do that?
Thank you.

Answer 1

As #SeanLintern88 mentioned, the way you really should be doing this is with auto layout constraints -- you don't want to be mixing setFrame with autolayout.
IBOutlet the height constraints for View 3 and View 5. Set the View 3 height constraint as inactive to start (if you want it to look like your storyboard does currently to start), then whenever the button is pressed, check which constraint is active and flip-flop them.
#import "ViewController.h"
#interface ViewController ()
#property (strong, nullable) IBOutlet NSLayoutConstraint *view3HeightConstraint;
#property (strong, nullable) IBOutlet NSLayoutConstraint *view5HeightConstraint;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// start us out as inactive
self.view3HeightConstraint.active = NO;
}
- (IBAction)btnPressed:(id)sender {
if (self.view5HeightConstraint.active) {
// view 5 height constraint is active
// you can set the height constants directly in storyboard as well
self.view3HeightConstraint.constant = 50.0f;
self.view3HeightConstraint.active = YES;
self.view5HeightConstraint.active = NO;
} else {
// view 3 is height constraint is active
// you can set the height constants directly in storyboard as well
self.view5HeightConstraint.constant = 50.0f;
self.view5HeightConstraint.active = YES;
self.view3HeightConstraint.active = NO;
}
// animate the layoutIfNeeded so we can get a smooth animation transition
[UIView animateWithDuration:1.0f animations:^{
[self.view layoutIfNeeded];
}];
}
#end